Begin adding WebCore classes to bun

123 files changed, 12717 insertions, 1014 deletions

diff --git a/src/javascript/jsc/bindings/BunBuiltinNames.h b/src/javascript/jsc/bindings/BunBuiltinNames.h
index 58c039cef..bb8449c5e 100644
--- a/src/javascript/jsc/bindings/BunBuiltinNames.h
+++ b/src/javascript/jsc/bindings/BunBuiltinNames.h
@@ -2,12 +2,15 @@
 
 #pragma once
 
-#include "helpers.h"
 #include "root.h"
-#include <JavaScriptCore/BuiltinUtils.h>
 
 
-namespace Bun {
+#include "helpers.h"
+
+#include "JavaScriptCore/BuiltinUtils.h"
+
+
+namespace WebCore {
 
 using namespace JSC;
 
@@ -116,5 +119,5 @@ private:
     BUN_COMMON_PRIVATE_IDENTIFIERS_EACH_PROPERTY_NAME(DECLARE_BUILTIN_NAMES)
 };
 
-} // namespace Bun
+} // namespace WebCore
 
diff --git a/src/javascript/jsc/bindings/BunClientData.cpp b/src/javascript/jsc/bindings/BunClientData.cpp
index 0bda7dd69..9a4fa25f4 100644
--- a/src/javascript/jsc/bindings/BunClientData.cpp
+++ b/src/javascript/jsc/bindings/BunClientData.cpp
@@ -1,39 +1,47 @@
+#include "root.h"
 
 #include "BunClientData.h"
-#include "root.h"
 
-#include "JSDOMURL.h"
-#include <JavaScriptCore/FastMallocAlignedMemoryAllocator.h>
-#include <JavaScriptCore/HeapInlines.h>
-#include <JavaScriptCore/IsoHeapCellType.h>
-#include <JavaScriptCore/JSDestructibleObjectHeapCellType.h>
-#include <JavaScriptCore/MarkingConstraint.h>
-#include <JavaScriptCore/SubspaceInlines.h>
-#include <JavaScriptCore/VM.h>
-#include <wtf/MainThread.h>
+#include "ExtendedDOMClientIsoSubspaces.h"
+#include "ExtendedDOMIsoSubspaces.h"
+#include "JavaScriptCore/FastMallocAlignedMemoryAllocator.h"
+#include "JavaScriptCore/HeapInlines.h"
+#include "JavaScriptCore/IsoHeapCellType.h"
+#include "JavaScriptCore/JSDestructibleObjectHeapCellType.h"
+// #include "JavaScriptCore/MarkingConstraint.h"
+#include "JavaScriptCore/SubspaceInlines.h"
+#include "JavaScriptCore/VM.h"
+#include "wtf/MainThread.h"
 
-// #include "BunGCOutputConstraint.h"
+#include "JSDOMConstructorBase.h"
 
-namespace Bun {
-using namespace JSC;
-using namespace WebCore;
+#include "BunGCOutputConstraint.h"
+#include "WebCoreTypedArrayController.h"
 
-class ExtendedDOMClientIsoSubspaces;
-class ExtendedDOMIsoSubspaces;
+namespace WebCore {
+using namespace JSC;
 
-#define CLIENT_ISO_SUBSPACE_INIT(subspace) subspace(m_heapData->subspace)
 JSHeapData::JSHeapData(Heap& heap)
-    : m_domNamespaceObjectSpace ISO_SUBSPACE_INIT(heap, heap.cellHeapCellType, JSDOMObject)
+    // : m_domNamespaceObjectSpace ISO_SUBSPACE_INIT(heap, heap.cellHeapCellType, JSDOMObject)
+    // ,
+    : m_subspaces(makeUnique<ExtendedDOMIsoSubspaces>())
+    , m_domConstructorSpace ISO_SUBSPACE_INIT(heap, heap.cellHeapCellType, JSDOMConstructorBase)
 
 {
 }
 
+#define CLIENT_ISO_SUBSPACE_INIT(subspace) subspace(m_heapData->subspace)
+
 JSVMClientData::JSVMClientData(VM& vm)
     : m_builtinNames(vm)
     , m_heapData(JSHeapData::ensureHeapData(vm.heap))
+    , CLIENT_ISO_SUBSPACE_INIT(m_domConstructorSpace)
+    , m_clientSubspaces(makeUnique<ExtendedDOMClientIsoSubspaces>())
 {
 }
 
+#undef CLIENT_ISO_SUBSPACE_INIT
+
 JSHeapData* JSHeapData::ensureHeapData(Heap& heap)
 {
     if (!Options::useGlobalGC())
@@ -53,11 +61,11 @@ void JSVMClientData::create(VM* vm)
 {
     JSVMClientData* clientData = new JSVMClientData(*vm);
     vm->clientData = clientData; // ~VM deletes this pointer.
+    clientData->m_normalWorld = DOMWrapperWorld::create(*vm, DOMWrapperWorld::Type::Normal);
 
     // vm->heap.addMarkingConstraint(makeUnique<BunGCOutputConstraint>(*vm, *clientData));
 
-    //   vm->m_typedArrayController = adoptRef(new WebCoreTypedArrayController(
-    //     type == WorkerThreadType::DedicatedWorker || type == WorkerThreadType::Worklet));
+    // vm->m_typedArrayController = adoptRef(new WebCoreTypedArrayController(true));
 }
 
-} // namespace Bun
\ No newline at end of file
+} // namespace WebCore
\ No newline at end of file
diff --git a/src/javascript/jsc/bindings/BunClientData.h b/src/javascript/jsc/bindings/BunClientData.h
index fc48148cd..4e4573a62 100644
--- a/src/javascript/jsc/bindings/BunClientData.h
+++ b/src/javascript/jsc/bindings/BunClientData.h
@@ -1,15 +1,31 @@
 #pragma once
 
-#include "BunBuiltinNames.h"
+namespace WebCore {
+
+class ExtendedDOMClientIsoSubspaces;
+class ExtendedDOMIsoSubspaces;
+
+class DOMWrapperWorld;
+}
+
 #include "root.h"
-#include <JavaScriptCore/BuiltinUtils.h>
-#include <JavaScriptCore/IsoSubspacePerVM.h>
-#include <JavaScriptCore/JSDestructibleObjectHeapCellType.h>
-#include <wtf/HashSet.h>
-#include <wtf/RefPtr.h>
 
-namespace Bun {
+#include "ExtendedDOMClientIsoSubspaces.h"
+#include "ExtendedDOMIsoSubspaces.h"
+#include "DOMIsoSubspaces.h"
+// #include "DOMWrapperWorld.h"
+#include "BunBuiltinNames.h"
+// #include "WebCoreJSBuiltins.h"
+// #include "WorkerThreadType.h"
+#include "wtf/Function.h"
+#include "wtf/HashSet.h"
+#include "wtf/RefPtr.h"
+
+#include "JavaScriptCore/IsoSubspacePerVM.h"
+
+namespace WebCore {
 using namespace JSC;
+using namespace Zig;
 
 enum class UseCustomHeapCellType { Yes,
     No };
@@ -25,7 +41,7 @@ public:
     static JSHeapData* ensureHeapData(JSC::Heap&);
 
     Lock& lock() { return m_lock; }
-    // ExtendedDOMIsoSubspaces& subspaces() { return *m_subspaces.get(); }
+    ExtendedDOMIsoSubspaces& subspaces() { return *m_subspaces.get(); }
 
     Vector<JSC::IsoSubspace*>& outputConstraintSpaces() { return m_outputConstraintSpaces; }
 
@@ -36,13 +52,15 @@ public:
             func(*space);
     }
 
-    JSC::IsoSubspace m_domNamespaceObjectSpace;
+    // JSC::IsoSubspace m_domNamespaceObjectSpace;
 
 private:
     Lock m_lock;
 
 private:
-    // std::unique_ptr<ExtendedDOMIsoSubspaces> m_subspaces;
+    std::unique_ptr<ExtendedDOMIsoSubspaces> m_subspaces;
+    JSC::IsoSubspace m_domConstructorSpace;
+
     Vector<JSC::IsoSubspace*> m_outputConstraintSpaces;
 };
 
@@ -59,36 +77,96 @@ public:
 
     JSHeapData& heapData() { return *m_heapData; }
     BunBuiltinNames& builtinNames() { return m_builtinNames; }
-    // ExtendedDOMClientIsoSubspaces& clientSubspaces() { return *m_clientSubspaces.get(); }
 
-    // Vector<JSC::IsoSubspace *> &outputConstraintSpaces() { return m_outputConstraintSpaces; }
+    WebCore::DOMWrapperWorld& normalWorld() { return *m_normalWorld; }
+
+    JSC::GCClient::IsoSubspace& domConstructorSpace() { return m_domConstructorSpace; }
+
+    ExtendedDOMClientIsoSubspaces& clientSubspaces() { return *m_clientSubspaces.get(); }
+
+    Vector<JSC::IsoSubspace*>& outputConstraintSpaces() { return m_outputConstraintSpaces; }
 
-    // template<typename Func> void forEachOutputConstraintSpace(const Func& func)
-    // {
-    //     for (auto* space : m_outputConstraintSpaces)
-    //         func(*space);
-    // }
+    template<typename Func> void forEachOutputConstraintSpace(const Func& func)
+    {
+        for (auto* space : m_outputConstraintSpaces)
+            func(*space);
+    }
 
 private:
     BunBuiltinNames m_builtinNames;
 
     JSHeapData* m_heapData;
 
-    // Vector<JSC::IsoSubspace *> m_outputConstraintSpaces;
+    RefPtr<WebCore::DOMWrapperWorld> m_normalWorld;
+    JSC::GCClient::IsoSubspace m_domConstructorSpace;
+
+    // JSC::IsoSubspace m_domNamespaceObjectSpace;
+
+    std::unique_ptr<ExtendedDOMClientIsoSubspaces> m_clientSubspaces;
+    Vector<JSC::IsoSubspace*> m_outputConstraintSpaces;
 };
 
 template<typename T, UseCustomHeapCellType useCustomHeapCellType, typename GetClient, typename SetClient, typename GetServer, typename SetServer>
 ALWAYS_INLINE JSC::GCClient::IsoSubspace* subspaceForImpl(JSC::VM& vm, GetClient getClient, SetClient setClient, GetServer getServer, SetServer setServer, JSC::HeapCellType& (*getCustomHeapCellType)(JSHeapData&) = nullptr)
 {
-    static NeverDestroyed<JSC::IsoSubspacePerVM> perVM([](JSC::Heap& heap) {
-        return ISO_SUBSPACE_PARAMETERS(heap.destructibleObjectHeapCellType, T);
-    });
-    return &perVM.get().clientIsoSubspaceforVM(vm);
+    auto& clientData = *static_cast<JSVMClientData*>(vm.clientData);
+    auto& clientSubspaces = clientData.clientSubspaces();
+    if (auto* clientSpace = getClient(clientSubspaces))
+        return clientSpace;
+
+    auto& heapData = clientData.heapData();
+    Locker locker { heapData.lock() };
+
+    auto& subspaces = heapData.subspaces();
+    JSC::IsoSubspace* space = getServer(subspaces);
+    if (!space) {
+        JSC::Heap& heap = vm.heap;
+        std::unique_ptr<JSC::IsoSubspace> uniqueSubspace;
+        static_assert(useCustomHeapCellType == UseCustomHeapCellType::Yes || std::is_base_of_v<JSC::JSDestructibleObject, T> || !T::needsDestruction);
+        if constexpr (useCustomHeapCellType == UseCustomHeapCellType::Yes)
+            uniqueSubspace = makeUnique<JSC::IsoSubspace> ISO_SUBSPACE_INIT(heap, getCustomHeapCellType(heapData), T);
+        else {
+            if constexpr (std::is_base_of_v<JSC::JSDestructibleObject, T>)
+                uniqueSubspace = makeUnique<JSC::IsoSubspace> ISO_SUBSPACE_INIT(heap, heap.destructibleObjectHeapCellType, T);
+            else
+                uniqueSubspace = makeUnique<JSC::IsoSubspace> ISO_SUBSPACE_INIT(heap, heap.cellHeapCellType, T);
+        }
+        space = uniqueSubspace.get();
+        setServer(subspaces, uniqueSubspace);
+
+        IGNORE_WARNINGS_BEGIN("unreachable-code")
+        IGNORE_WARNINGS_BEGIN("tautological-compare")
+        void (*myVisitOutputConstraint)(JSC::JSCell*, JSC::SlotVisitor&) = T::visitOutputConstraints;
+        void (*jsCellVisitOutputConstraint)(JSC::JSCell*, JSC::SlotVisitor&) = JSC::JSCell::visitOutputConstraints;
+        if (myVisitOutputConstraint != jsCellVisitOutputConstraint)
+            heapData.outputConstraintSpaces().append(space);
+        IGNORE_WARNINGS_END
+        IGNORE_WARNINGS_END
+    }
+
+    auto uniqueClientSubspace = makeUnique<JSC::GCClient::IsoSubspace>(*space);
+    auto* clientSpace = uniqueClientSubspace.get();
+    setClient(clientSubspaces, uniqueClientSubspace);
+    return clientSpace;
 }
 
+// template<typename T, UseCustomHeapCellType useCustomHeapCellType, typename GetClient, typename SetClient, typename GetServer, typename SetServer>
+// ALWAYS_INLINE JSC::GCClient::IsoSubspace* subspaceForImpl(JSC::VM& vm, GetClient getClient, SetClient setClient, GetServer getServer, SetServer setServer, JSC::HeapCellType& (*getCustomHeapCellType)(JSHeapData&) = nullptr)
+// {
+//     static NeverDestroyed<JSC::IsoSubspacePerVM> perVM([](JSC::Heap& heap) {
+//         return ISO_SUBSPACE_PARAMETERS(heap.destructibleObjectHeapCellType, T);
+//     });
+//     return &perVM.get().clientIsoSubspaceforVM(vm);
+// }
+
 static JSVMClientData* clientData(JSC::VM& vm)
 {
-    return static_cast<Bun::JSVMClientData*>(vm.clientData);
+    return static_cast<WebCore::JSVMClientData*>(vm.clientData);
 }
 
-} // namespace Bun
+} // namespace WebCore
+
+namespace WebCore {
+using JSVMClientData = WebCore::JSVMClientData;
+using JSHeapData = WebCore::JSHeapData;
+}
\ No newline at end of file
diff --git a/src/javascript/jsc/bindings/BunGCOutputConstraint.cpp b/src/javascript/jsc/bindings/BunGCOutputConstraint.cpp
index 53f4bbb90..ef5bba244 100644
--- a/src/javascript/jsc/bindings/BunGCOutputConstraint.cpp
+++ b/src/javascript/jsc/bindings/BunGCOutputConstraint.cpp
@@ -1,53 +1,52 @@
 
 
-// #include "BunGCOutputConstraint.h"
-
-// #include "BunClientData.h"
-// #include <JavaScriptCore/BlockDirectoryInlines.h>
-// #include <JavaScriptCore/HeapInlines.h>
-// #include <JavaScriptCore/MarkedBlockInlines.h>
-// #include <JavaScriptCore/MarkingConstraint.h>
-// #include <JavaScriptCore/SubspaceInlines.h>
-// #include <JavaScriptCore/VM.h>
-
-// namespace Bun {
-
-// using namespace JSC;
-
-// BunGCOutputConstraint::BunGCOutputConstraint(VM& vm, Bun::JSVMClientData& clientData)
-//     : MarkingConstraint("Domo", "DOM Output", ConstraintVolatility::SeldomGreyed,
-//         ConstraintConcurrency::Concurrent, ConstraintParallelism::Parallel)
-//     , m_vm(vm)
-//     , m_clientData(clientData)
-//     , m_lastExecutionVersion(vm.heap.mutatorExecutionVersion())
-// {
-// }
-
-// template<typename Visitor> void BunGCOutputConstraint::executeImplImpl(Visitor& visitor)
-// {
-//     Heap& heap = m_vm.heap;
-
-//     if (heap.mutatorExecutionVersion() == m_lastExecutionVersion)
-//         return;
-
-//     m_lastExecutionVersion = heap.mutatorExecutionVersion();
-
-//     m_clientData.forEachOutputConstraintSpace([&](Subspace& subspace) {
-//         auto func = [](Visitor& visitor, HeapCell* heapCell, HeapCell::Kind) {
-//             SetRootMarkReasonScope rootScope(visitor, RootMarkReason::DOMGCOutput);
-//             JSCell* cell = static_cast<JSCell*>(heapCell);
-//             cell->methodTable(visitor.vm())->visitOutputConstraints(cell, visitor);
-//         };
-
-//         RefPtr<SharedTask<void(Visitor&)>> task = subspace.template forEachMarkedCellInParallel<Visitor>(func);
-//         visitor.addParallelConstraintTask(task);
-//     });
-// }
-
-// void BunGCOutputConstraint::executeImpl(AbstractSlotVisitor& visitor)
-// {
-//     executeImplImpl(visitor);
-// }
-// void BunGCOutputConstraint::executeImpl(SlotVisitor& visitor) { executeImplImpl(visitor); }
-
-// } // namespace Bun
+#include "BunGCOutputConstraint.h"
+
+#include "BunClientData.h"
+#include "JavaScriptCore/BlockDirectoryInlines.h"
+#include "JavaScriptCore/HeapInlines.h"
+#include "JavaScriptCore/MarkedBlockInlines.h"
+#include "JavaScriptCore/MarkingConstraint.h"
+#include "JavaScriptCore/SubspaceInlines.h"
+#include "JavaScriptCore/VM.h"
+
+namespace WebCore {
+
+using namespace JSC;
+
+BunGCOutputConstraint::BunGCOutputConstraint(VM& vm, WebCore::JSVMClientData& clientData)
+    : MarkingConstraint("Domo", "DOM Output", ConstraintVolatility::SeldomGreyed, ConstraintConcurrency::Concurrent, ConstraintParallelism::Parallel)
+    , m_vm(vm)
+    , m_clientData(clientData)
+    , m_lastExecutionVersion(vm.heap.mutatorExecutionVersion())
+{
+}
+
+template<typename Visitor> void BunGCOutputConstraint::executeImplImpl(Visitor& visitor)
+{
+    Heap& heap = m_vm.heap;
+
+    if (heap.mutatorExecutionVersion() == m_lastExecutionVersion)
+        return;
+
+    m_lastExecutionVersion = heap.mutatorExecutionVersion();
+
+    m_clientData.forEachOutputConstraintSpace([&](Subspace& subspace) {
+        auto func = [](Visitor& visitor, HeapCell* heapCell, HeapCell::Kind) {
+            SetRootMarkReasonScope rootScope(visitor, RootMarkReason::DOMGCOutput);
+            JSCell* cell = static_cast<JSCell*>(heapCell);
+            cell->methodTable(visitor.vm())->visitOutputConstraints(cell, visitor);
+        };
+
+        RefPtr<SharedTask<void(Visitor&)>> task = subspace.template forEachMarkedCellInParallel<Visitor>(func);
+        visitor.addParallelConstraintTask(task);
+    });
+}
+
+void BunGCOutputConstraint::executeImpl(AbstractSlotVisitor& visitor)
+{
+    executeImplImpl(visitor);
+}
+void BunGCOutputConstraint::executeImpl(SlotVisitor& visitor) { executeImplImpl(visitor); }
+
+} // namespace WebCore
diff --git a/src/javascript/jsc/bindings/BunGCOutputConstraint.h b/src/javascript/jsc/bindings/BunGCOutputConstraint.h
index 003f110b4..ad23c5e32 100644
--- a/src/javascript/jsc/bindings/BunGCOutputConstraint.h
+++ b/src/javascript/jsc/bindings/BunGCOutputConstraint.h
@@ -1,34 +1,35 @@
 
-// #pragma once
+#pragma once
 
-// #include "root.h"
-// #include <JavaScriptCore/MarkingConstraint.h>
+#include "root.h"
 
-// namespace JSC {
-// class VM;
-// }
+#include "JavaScriptCore/MarkingConstraint.h"
 
-// namespace Bun {
+namespace JSC {
+class VM;
+}
 
-// class JSVMClientData;
+namespace WebCore {
 
-// class BunGCOutputConstraint : public JSC::MarkingConstraint {
-//     WTF_MAKE_FAST_ALLOCATED;
+class JSVMClientData;
 
-// public:
-//     BunGCOutputConstraint(JSC::VM&, Bun::JSVMClientData&);
-//     ~BunGCOutputConstraint() {};
+class BunGCOutputConstraint : public JSC::MarkingConstraint {
+    WTF_MAKE_FAST_ALLOCATED;
 
-// protected:
-//     void executeImpl(JSC::AbstractSlotVisitor&) override;
-//     void executeImpl(JSC::SlotVisitor&) override;
+public:
+    BunGCOutputConstraint(JSC::VM&, WebCore::JSVMClientData&);
+    ~BunGCOutputConstraint() {};
 
-// private:
-//     template<typename Visitor> void executeImplImpl(Visitor&);
+protected:
+    void executeImpl(JSC::AbstractSlotVisitor&) override;
+    void executeImpl(JSC::SlotVisitor&) override;
 
-//     JSC::VM& m_vm;
-//     JSVMClientData& m_clientData;
-//     uint64_t m_lastExecutionVersion;
-// };
+private:
+    template<typename Visitor> void executeImplImpl(Visitor&);
 
-// } // namespace Bun
+    JSC::VM& m_vm;
+    JSVMClientData& m_clientData;
+    uint64_t m_lastExecutionVersion;
+};
+
+} // namespace WebCore
diff --git a/src/javascript/jsc/bindings/BunStream.cpp b/src/javascript/jsc/bindings/BunStream.cpp
index 2214454bf..13f330ed0 100644
--- a/src/javascript/jsc/bindings/BunStream.cpp
+++ b/src/javascript/jsc/bindings/BunStream.cpp
@@ -1,8 +1,10 @@
 #include "BunStream.h"
-#include <JavaScriptCore/JSMicrotask.h>
-#include <JavaScriptCore/ObjectConstructor.h>
+#include "JavaScriptCore/JSMicrotask.h"
+#include "JavaScriptCore/ObjectConstructor.h"
 
-namespace Bun {
+#include "JavaScriptCore/JSCInlines.h"
+
+namespace WebCore {
 using JSGlobalObject = JSC::JSGlobalObject;
 using Exception = JSC::Exception;
 using JSValue = JSC::JSValue;
@@ -127,7 +129,7 @@ static JSC_DEFINE_HOST_FUNCTION(Readable__on,
     JSC::VM& vm = globalObject->vm();
     auto scope = DECLARE_THROW_SCOPE(vm);
 
-    auto thisObject = JSC::jsDynamicCast<Bun::Readable*>(vm, callFrame->thisValue());
+    auto thisObject = JSC::jsDynamicCast<WebCore::Readable*>(vm, callFrame->thisValue());
     if (UNLIKELY(!thisObject)) {
         scope.release();
         JSC::throwVMTypeError(globalObject, scope);
@@ -163,7 +165,7 @@ static JSC_DEFINE_HOST_FUNCTION(Readable__on,
 
 extern "C" Bun__Readable* JSC__JSValue__getReadableStreamState(JSC__JSValue value, JSC__VM* vm)
 {
-    auto* thisObject = JSC::jsDynamicCast<Bun::Readable*>(*vm, JSC::JSValue::decode(value));
+    auto* thisObject = JSC::jsDynamicCast<WebCore::Readable*>(*vm, JSC::JSValue::decode(value));
     if (UNLIKELY(!thisObject)) {
         return nullptr;
     }
@@ -171,17 +173,17 @@ extern "C" Bun__Readable* JSC__JSValue__getReadableStreamState(JSC__JSValue valu
 }
 extern "C" Bun__Writable* JSC__JSValue__getWritableStreamState(JSC__JSValue value, JSC__VM* vm)
 {
-    auto* thisObject = JSC::jsDynamicCast<Bun::Writable*>(*vm, JSC::JSValue::decode(value));
+    auto* thisObject = JSC::jsDynamicCast<WebCore::Writable*>(*vm, JSC::JSValue::decode(value));
     if (UNLIKELY(!thisObject)) {
         return nullptr;
     }
     return thisObject->state;
 }
 
-const JSC::ClassInfo Readable::s_info = { "Readable", &Base::s_info, nullptr, nullptr,
+const JSC::ClassInfo Readable::s_info = { "Readable"_s, &Base::s_info, nullptr, nullptr,
     CREATE_METHOD_TABLE(Readable) };
 
-const JSC::ClassInfo Writable::s_info = { "Writable", &Base::s_info, nullptr, nullptr,
+const JSC::ClassInfo Writable::s_info = { "Writable"_s, &Base::s_info, nullptr, nullptr,
     CREATE_METHOD_TABLE(Writable) };
 
 static JSC_DEFINE_HOST_FUNCTION(Readable__once,
@@ -194,7 +196,7 @@ static JSC_DEFINE_HOST_FUNCTION(Readable__once,
     JSC::VM& vm = globalObject->vm();
     auto scope = DECLARE_THROW_SCOPE(vm);
 
-    auto thisObject = JSC::jsDynamicCast<Bun::Readable*>(vm, callFrame->thisValue());
+    auto thisObject = JSC::jsDynamicCast<WebCore::Readable*>(vm, callFrame->thisValue());
     if (UNLIKELY(!thisObject)) {
         scope.release();
         JSC::throwVMTypeError(globalObject, scope);
@@ -238,7 +240,7 @@ static JSC_DEFINE_HOST_FUNCTION(Writable__on,
     JSC::VM& vm = globalObject->vm();
     auto scope = DECLARE_THROW_SCOPE(vm);
 
-    auto thisObject = JSC::jsDynamicCast<Bun::Writable*>(vm, callFrame->thisValue());
+    auto thisObject = JSC::jsDynamicCast<WebCore::Writable*>(vm, callFrame->thisValue());
     if (UNLIKELY(!thisObject)) {
         scope.release();
         JSC::throwVMTypeError(globalObject, scope);
@@ -282,7 +284,7 @@ static JSC_DEFINE_HOST_FUNCTION(Writable__once,
     JSC::VM& vm = globalObject->vm();
     auto scope = DECLARE_THROW_SCOPE(vm);
 
-    auto thisObject = JSC::jsDynamicCast<Bun::Writable*>(vm, callFrame->thisValue());
+    auto thisObject = JSC::jsDynamicCast<WebCore::Writable*>(vm, callFrame->thisValue());
     if (UNLIKELY(!thisObject)) {
         scope.release();
         JSC::throwVMTypeError(globalObject, scope);
@@ -319,71 +321,71 @@ static JSC_DEFINE_HOST_FUNCTION(Writable__once,
 static JSC_DEFINE_HOST_FUNCTION(Readable__read,
     (JSC::JSGlobalObject * globalObject, JSC::CallFrame* callFrame))
 {
-    DEFINE_CALLBACK_FUNCTION_BODY(Bun::Readable, Bun__Readable__read);
+    DEFINE_CALLBACK_FUNCTION_BODY(WebCore::Readable, Bun__Readable__read);
 }
 
 static JSC_DEFINE_HOST_FUNCTION(Readable__pipe,
     (JSC::JSGlobalObject * globalObject, JSC::CallFrame* callFrame))
 {
-    DEFINE_CALLBACK_FUNCTION_BODY(Bun::Readable, Bun__Readable__pipe);
+    DEFINE_CALLBACK_FUNCTION_BODY(WebCore::Readable, Bun__Readable__pipe);
 }
 
 static JSC_DEFINE_HOST_FUNCTION(Readable__resume,
     (JSC::JSGlobalObject * globalObject, JSC::CallFrame* callFrame))
 {
-    DEFINE_CALLBACK_FUNCTION_BODY(Bun::Readable, Bun__Readable__resume);
+    DEFINE_CALLBACK_FUNCTION_BODY(WebCore::Readable, Bun__Readable__resume);
 }
 static JSC_DEFINE_HOST_FUNCTION(Readable__unpipe,
     (JSC::JSGlobalObject * globalObject, JSC::CallFrame* callFrame))
 {
-    DEFINE_CALLBACK_FUNCTION_BODY(Bun::Readable, Bun__Readable__unpipe);
+    DEFINE_CALLBACK_FUNCTION_BODY(WebCore::Readable, Bun__Readable__unpipe);
 }
 static JSC_DEFINE_HOST_FUNCTION(Readable__pause,
     (JSC::JSGlobalObject * globalObject, JSC::CallFrame* callFrame))
 {
-    DEFINE_CALLBACK_FUNCTION_BODY(Bun::Readable, Bun__Readable__pause);
+    DEFINE_CALLBACK_FUNCTION_BODY(WebCore::Readable, Bun__Readable__pause);
 }
 static JSC_DEFINE_HOST_FUNCTION(Readable__unshift,
     (JSC::JSGlobalObject * globalObject, JSC::CallFrame* callFrame))
 {
-    DEFINE_CALLBACK_FUNCTION_BODY(Bun::Readable, Bun__Readable__unshift);
+    DEFINE_CALLBACK_FUNCTION_BODY(WebCore::Readable, Bun__Readable__unshift);
 }
 
 // static JSC_DECLARE_HOST_FUNCTION(Readable__isPaused);
 // static JSC_DECLARE_HOST_FUNCTION(Writable__setDefaultEncoding);
 
-// static DEFINE_CALLBACK_FUNCTION(Writable__setDefaultEncoding, Bun::Writable,
+// static DEFINE_CALLBACK_FUNCTION(Writable__setDefaultEncoding, WebCore::Writable,
 //                                 Bun__Writable__setDefaultEncoding);
 
 static JSC_DEFINE_HOST_FUNCTION(Writable__write,
     (JSC::JSGlobalObject * globalObject, JSC::CallFrame* callFrame))
 {
-    DEFINE_CALLBACK_FUNCTION_BODY(Bun::Writable, Bun__Writable__write);
+    DEFINE_CALLBACK_FUNCTION_BODY(WebCore::Writable, Bun__Writable__write);
 }
 static JSC_DEFINE_HOST_FUNCTION(Writable__end,
     (JSC::JSGlobalObject * globalObject, JSC::CallFrame* callFrame))
 {
-    DEFINE_CALLBACK_FUNCTION_BODY(Bun::Writable, Bun__Writable__end);
+    DEFINE_CALLBACK_FUNCTION_BODY(WebCore::Writable, Bun__Writable__end);
 }
 static JSC_DEFINE_HOST_FUNCTION(Writable__close,
     (JSC::JSGlobalObject * globalObject, JSC::CallFrame* callFrame))
 {
-    DEFINE_CALLBACK_FUNCTION_BODY(Bun::Writable, Bun__Writable__close);
+    DEFINE_CALLBACK_FUNCTION_BODY(WebCore::Writable, Bun__Writable__close);
 }
 static JSC_DEFINE_HOST_FUNCTION(Writable__destroy,
     (JSC::JSGlobalObject * globalObject, JSC::CallFrame* callFrame))
 {
-    DEFINE_CALLBACK_FUNCTION_BODY(Bun::Writable, Bun__Writable__destroy);
+    DEFINE_CALLBACK_FUNCTION_BODY(WebCore::Writable, Bun__Writable__destroy);
 }
 static JSC_DEFINE_HOST_FUNCTION(Writable__cork,
     (JSC::JSGlobalObject * globalObject, JSC::CallFrame* callFrame))
 {
-    DEFINE_CALLBACK_FUNCTION_BODY(Bun::Writable, Bun__Writable__cork);
+    DEFINE_CALLBACK_FUNCTION_BODY(WebCore::Writable, Bun__Writable__cork);
 }
 static JSC_DEFINE_HOST_FUNCTION(Writable__uncork,
     (JSC::JSGlobalObject * globalObject, JSC::CallFrame* callFrame))
 {
-    DEFINE_CALLBACK_FUNCTION_BODY(Bun::Writable, Bun__Writable__uncork);
+    DEFINE_CALLBACK_FUNCTION_BODY(WebCore::Writable, Bun__Writable__uncork);
 }
 
 extern "C" JSC__JSValue Bun__Readable__create(Bun__Readable* state,
@@ -422,7 +424,7 @@ Writable::~Writable()
 void Readable::finishCreation(JSC::VM& vm)
 {
     Base::finishCreation(vm);
-    auto clientData = Bun::clientData(vm);
+    auto clientData = WebCore::clientData(vm);
     auto* globalObject = this->globalObject();
 
     putDirect(vm, clientData->builtinNames().onPublicName(),
@@ -469,7 +471,7 @@ void Readable::finishCreation(JSC::VM& vm)
 void Writable::finishCreation(JSC::VM& vm)
 {
     Base::finishCreation(vm);
-    auto clientData = Bun::clientData(vm);
+    auto clientData = WebCore::clientData(vm);
 
     auto* globalObject = this->globalObject();
 
@@ -524,4 +526,4 @@ void Writable::finishCreation(JSC::VM& vm)
         0);
 }
 
-} // namespace Bun
\ No newline at end of file
+} // namespace WebCore
\ No newline at end of file
diff --git a/src/javascript/jsc/bindings/BunStream.h b/src/javascript/jsc/bindings/BunStream.h
index 39d015558..64837c219 100644
--- a/src/javascript/jsc/bindings/BunStream.h
+++ b/src/javascript/jsc/bindings/BunStream.h
@@ -4,7 +4,7 @@
 #include "BunClientData.h"
 #include "root.h"
 
-namespace Bun {
+namespace WebCore {
 
 using namespace JSC;
 
@@ -39,7 +39,7 @@ public:
 
     static Readable* create(JSC::VM& vm, Bun__Readable* state, JSC::Structure* structure)
     {
-        Readable* accessor = new (NotNull, JSC::allocateCell<Bun::Readable>(vm)) Readable(vm, state, structure);
+        Readable* accessor = new (NotNull, JSC::allocateCell<WebCore::Readable>(vm)) Readable(vm, state, structure);
         accessor->finishCreation(vm);
         return accessor;
     }
@@ -86,4 +86,4 @@ public:
     void finishCreation(JSC::VM& vm);
 };
 
-} // namespace Bun
\ No newline at end of file
+} // namespace WebCore
\ No newline at end of file
diff --git a/src/javascript/jsc/bindings/DOMException.h b/src/javascript/jsc/bindings/DOMException.h
index b764393c1..f5e48262b 100644
--- a/src/javascript/jsc/bindings/DOMException.h
+++ b/src/javascript/jsc/bindings/DOMException.h
@@ -30,7 +30,7 @@
 #include "root.h"
 
 #include "ExceptionCode.h"
-#include <wtf/text/WTFString.h>
+#include "wtf/text/WTFString.h"
 
 namespace WebCore {
 
diff --git a/src/javascript/jsc/bindings/DOMFormData.h b/src/javascript/jsc/bindings/DOMFormData.h
index 9592afdbe..d2450d282 100644
--- a/src/javascript/jsc/bindings/DOMFormData.h
+++ b/src/javascript/jsc/bindings/DOMFormData.h
@@ -33,8 +33,8 @@
 // #include "File.h"
 // #include <pal/text/TextEncoding.h>
 // #include <variant>
-// #include <wtf/RefCounted.h>
-// #include <wtf/text/WTFString.h>
+// #include "wtf/RefCounted.h"
+// #include "wtf/text/WTFString.h"
 
 // namespace WebCore {
 
diff --git a/src/javascript/jsc/bindings/DOMURL.cpp b/src/javascript/jsc/bindings/DOMURL.cpp
index 8b437b5b7..31381b867 100644
--- a/src/javascript/jsc/bindings/DOMURL.cpp
+++ b/src/javascript/jsc/bindings/DOMURL.cpp
@@ -32,7 +32,7 @@
 // #include "PublicURLManager.h"
 // #include "ResourceRequest.h"
 #include "URLSearchParams.h"
-// #include <wtf/MainThread.h>
+// #include "wtf/MainThread.h"
 
 namespace WebCore {
 
diff --git a/src/javascript/jsc/bindings/DOMURL.h b/src/javascript/jsc/bindings/DOMURL.h
index aa7c1eddf..0a6210690 100644
--- a/src/javascript/jsc/bindings/DOMURL.h
+++ b/src/javascript/jsc/bindings/DOMURL.h
@@ -30,8 +30,8 @@
 
 #include "ExceptionOr.h"
 #include "URLDecomposition.h"
-#include <wtf/URL.h>
-#include <wtf/WeakPtr.h>
+#include "wtf/URL.h"
+#include "wtf/WeakPtr.h"
 
 namespace WebCore {
 
diff --git a/src/javascript/jsc/bindings/DOMWrapperWorld-class.h b/src/javascript/jsc/bindings/DOMWrapperWorld-class.h
new file mode 100644
index 000000000..0c33f37ef
--- /dev/null
+++ b/src/javascript/jsc/bindings/DOMWrapperWorld-class.h
@@ -0,0 +1,65 @@
+#pragma once
+
+#include "root.h"
+
+#include "JavaScriptCore/JSCInlines.h"
+
+#include "wtf/Forward.h"
+
+namespace WebCore {
+
+class WindowProxy;
+
+typedef HashMap<void*, JSC::Weak<JSC::JSObject>> DOMObjectWrapperMap;
+
+class DOMWrapperWorld : public RefCounted<DOMWrapperWorld> {
+public:
+    enum class Type {
+        Normal, // Main (e.g. Page)
+        User, // User Scripts (e.g. Extensions)
+        Internal, // WebKit Internal (e.g. Media Controls)
+    };
+
+    static Ref<DOMWrapperWorld> create(JSC::VM& vm, Type type = Type::Internal, const String& name = {})
+    {
+        return adoptRef(*new DOMWrapperWorld(vm, type, name));
+    }
+    WEBCORE_EXPORT ~DOMWrapperWorld();
+
+    // Free as much memory held onto by this world as possible.
+    WEBCORE_EXPORT void clearWrappers();
+
+    void didCreateWindowProxy(WindowProxy* controller) { m_jsWindowProxies.add(controller); }
+    void didDestroyWindowProxy(WindowProxy* controller) { m_jsWindowProxies.remove(controller); }
+
+    void setShadowRootIsAlwaysOpen() { m_shadowRootIsAlwaysOpen = true; }
+    bool shadowRootIsAlwaysOpen() const { return m_shadowRootIsAlwaysOpen; }
+
+    void disableLegacyOverrideBuiltInsBehavior() { m_shouldDisableLegacyOverrideBuiltInsBehavior = true; }
+    bool shouldDisableLegacyOverrideBuiltInsBehavior() const { return m_shouldDisableLegacyOverrideBuiltInsBehavior; }
+
+    DOMObjectWrapperMap& wrappers() { return m_wrappers; }
+
+    Type type() const { return m_type; }
+    bool isNormal() const { return m_type == Type::Normal; }
+
+    const String& name() const { return m_name; }
+
+    JSC::VM& vm() const { return m_vm; }
+
+protected:
+    DOMWrapperWorld(JSC::VM&, Type, const String& name);
+
+private:
+    JSC::VM& m_vm;
+    HashSet<WindowProxy*> m_jsWindowProxies;
+    DOMObjectWrapperMap m_wrappers;
+
+    String m_name;
+    Type m_type { Type::Internal };
+
+    bool m_shadowRootIsAlwaysOpen { false };
+    bool m_shouldDisableLegacyOverrideBuiltInsBehavior { false };
+};
+
+} // namespace WebCore
diff --git a/src/javascript/jsc/bindings/DOMWrapperWorld.cpp b/src/javascript/jsc/bindings/DOMWrapperWorld.cpp
new file mode 100644
index 000000000..f0d92ee84
--- /dev/null
+++ b/src/javascript/jsc/bindings/DOMWrapperWorld.cpp
@@ -0,0 +1,71 @@
+/*
+ *  Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
+ *  Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
+ *  Copyright (C) 2007 Samuel Weinig <sam@webkit.org>
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include "root.h"
+
+#include "DOMWrapperWorld.h"
+
+// #include "JSDOMWindow.h"
+#include "WebCoreJSClientData.h"
+// #include "WindowProxy.h"
+#include "ZigGlobalObject.h"
+#include "wtf/MainThread.h"
+
+namespace WebCore {
+
+using namespace JSC;
+
+DOMWrapperWorld::DOMWrapperWorld(JSC::VM& vm, Type type, const String& name)
+    : m_vm(vm)
+    , m_name(name)
+    , m_type(type)
+{
+    VM::ClientData* clientData = m_vm.clientData;
+    ASSERT(clientData);
+    // static_cast<JSVMClientData*>(clientData)->rememberWorld(*this);
+}
+
+DOMWrapperWorld::~DOMWrapperWorld()
+{
+    VM::ClientData* clientData = m_vm.clientData;
+    ASSERT(clientData);
+    // static_cast<JSVMClientData*>(clientData)->forgetWorld(*this);
+}
+
+void DOMWrapperWorld::clearWrappers()
+{
+    m_wrappers.clear();
+}
+
+DOMWrapperWorld& normalWorld(JSC::VM& vm)
+{
+    VM::ClientData* clientData = vm.clientData;
+    ASSERT(clientData);
+    return static_cast<JSVMClientData*>(clientData)->normalWorld();
+}
+
+// DOMWrapperWorld& mainThreadNormalWorld()
+// {
+//     ASSERT(isMainThread());
+//     // static DOMWrapperWorld& cachedNormalWorld = normalWorld(commonVM());
+//     return cachedNormalWorld;
+// }
+
+} // namespace WebCore
diff --git a/src/javascript/jsc/bindings/DOMWrapperWorld.h b/src/javascript/jsc/bindings/DOMWrapperWorld.h
new file mode 100644
index 000000000..c03b5ed41
--- /dev/null
+++ b/src/javascript/jsc/bindings/DOMWrapperWorld.h
@@ -0,0 +1,59 @@
+/*
+ *  Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
+ *  Copyright (C) 2003, 2004, 2005, 2006, 2008, 2009 Apple Inc. All rights reserved.
+ *  Copyright (C) 2007 Samuel Weinig <sam@webkit.org>
+ *  Copyright (C) 2009 Google, Inc. All rights reserved.
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#pragma once
+
+#include "root.h"
+#include "DOMWrapperWorld-class.h"
+#include "ZigGlobalObject.h"
+
+namespace WebCore {
+
+DOMWrapperWorld& normalWorld(JSC::VM&);
+// WEBCORE_EXPORT DOMWrapperWorld& mainThreadNormalWorld();
+
+// inline DOMWrapperWorld& debuggerWorld() { return mainThreadNormalWorld(); }
+// inline DOMWrapperWorld& pluginWorld() { return mainThreadNormalWorld(); }
+
+DOMWrapperWorld& currentWorld(JSC::JSGlobalObject&);
+DOMWrapperWorld& worldForDOMObject(JSC::JSObject&);
+
+// Helper function for code paths that must not share objects across isolated DOM worlds.
+bool isWorldCompatible(JSC::JSGlobalObject&, JSC::JSValue);
+
+inline DOMWrapperWorld& currentWorld(JSC::JSGlobalObject& lexicalGlobalObject);
+inline DOMWrapperWorld& worldForDOMObject(JSC::JSObject& object);
+
+inline bool isWorldCompatible(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+{
+    return true;
+    // return !value.isObject() || &worldForDOMObject(*value.getObject()) == &currentWorld(lexicalGlobalObject);
+}
+
+inline DOMWrapperWorld& currentWorld(JSC::JSGlobalObject& lexicalGlobalObject)
+{
+    return JSC::jsCast<Zig::GlobalObject*>(&lexicalGlobalObject)->world();
+}
+inline DOMWrapperWorld& worldForDOMObject(JSC::JSObject& object)
+{
+    return JSC::jsCast<Zig::GlobalObject*>(object.globalObject())->world();
+};
+}
diff --git a/src/javascript/jsc/bindings/Exception.h b/src/javascript/jsc/bindings/Exception.h
index e14b1e01a..8607e3115 100644
--- a/src/javascript/jsc/bindings/Exception.h
+++ b/src/javascript/jsc/bindings/Exception.h
@@ -29,7 +29,7 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include "root.h"
 
 #include "ExceptionCode.h"
-#include <wtf/text/WTFString.h>
+#include "wtf/text/WTFString.h"
 
 namespace WebCore {
 
diff --git a/src/javascript/jsc/bindings/ExceptionCode.h b/src/javascript/jsc/bindings/ExceptionCode.h
index d63691db1..26c1e4ada 100644
--- a/src/javascript/jsc/bindings/ExceptionCode.h
+++ b/src/javascript/jsc/bindings/ExceptionCode.h
@@ -20,7 +20,7 @@
 
 #include "root.h"
 
-#include <wtf/EnumTraits.h>
+#include "wtf/EnumTraits.h"
 
 namespace WebCore {
 
diff --git a/src/javascript/jsc/bindings/ExceptionOr.h b/src/javascript/jsc/bindings/ExceptionOr.h
index 6ffd93fe1..f3378466e 100644
--- a/src/javascript/jsc/bindings/ExceptionOr.h
+++ b/src/javascript/jsc/bindings/ExceptionOr.h
@@ -29,9 +29,9 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include "root.h"
 
 #include "Exception.h"
-#include <wtf/CrossThreadCopier.h>
-#include <wtf/Expected.h>
-#include <wtf/StdLibExtras.h>
+#include "wtf/CrossThreadCopier.h"
+#include "wtf/Expected.h"
+#include "wtf/StdLibExtras.h"
 
 namespace WebCore {
 
diff --git a/src/javascript/jsc/bindings/GCDefferalContext.h b/src/javascript/jsc/bindings/GCDefferalContext.h
index 7bedfb3e0..994b16837 100644
--- a/src/javascript/jsc/bindings/GCDefferalContext.h
+++ b/src/javascript/jsc/bindings/GCDefferalContext.h
@@ -2,6 +2,8 @@
 
 #include "helpers.h"
 
+#include "JavaScriptCore/JSCInlines.h"
+
 namespace JSC {
 
 ALWAYS_INLINE GCDeferralContext::GCDeferralContext(VM& vm)
diff --git a/src/javascript/jsc/bindings/IDLTypes.h b/src/javascript/jsc/bindings/IDLTypes.h
index b597fb280..cadeea27e 100644
--- a/src/javascript/jsc/bindings/IDLTypes.h
+++ b/src/javascript/jsc/bindings/IDLTypes.h
@@ -25,14 +25,14 @@
 
 #pragma once
 
+#include "JavaScriptCore/HandleTypes.h"
+#include "JavaScriptCore/Strong.h"
 #include "StringAdaptors.h"
-#include <JavaScriptCore/HandleTypes.h>
-#include <JavaScriptCore/Strong.h>
+#include "wtf/Brigand.h"
+#include "wtf/StdLibExtras.h"
+#include "wtf/URL.h"
+#include "wtf/WallTime.h"
 #include <variant>
-#include <wtf/Brigand.h>
-#include <wtf/StdLibExtras.h>
-#include <wtf/URL.h>
-#include <wtf/WallTime.h>
 
 #if ENABLE(WEBGL)
 #include "WebGLAny.h"
diff --git a/src/javascript/jsc/bindings/JSCInlines.h b/src/javascript/jsc/bindings/JSCInlines.h
index 8e989aa6a..30e8b4133 100644
--- a/src/javascript/jsc/bindings/JSCInlines.h
+++ b/src/javascript/jsc/bindings/JSCInlines.h
@@ -36,22 +36,22 @@
 // In fact, it can make a lot of sense: outside of JSC, this file becomes a kind of umbrella
 // header that pulls in most (all?) of the interesting things in JSC.
 
-#include <JavaScriptCore/ExceptionHelpers.h>
-#include <JavaScriptCore/GCIncomingRefCountedInlines.h>
-#include <JavaScriptCore/HeapInlines.h>
-#include <JavaScriptCore/IdentifierInlines.h>
-#include <JavaScriptCore/JSArrayBufferViewInlines.h>
-#include <JavaScriptCore/JSCJSValueInlines.h>
-#include <JavaScriptCore/JSCellInlines.h>
-#include <JavaScriptCore/JSFunctionInlines.h>
-#include <JavaScriptCore/JSGlobalObjectInlines.h>
-#include <JavaScriptCore/JSObjectInlines.h>
-#include <JavaScriptCore/JSProxy.h>
-#include <JavaScriptCore/JSString.h>
-#include <JavaScriptCore/Operations.h>
-#include <JavaScriptCore/SlotVisitorInlines.h>
-#include <JavaScriptCore/StrongInlines.h>
-#include <JavaScriptCore/StructureInlines.h>
-#include <JavaScriptCore/ThrowScope.h>
-#include <JavaScriptCore/WeakGCMapInlines.h>
-#include <JavaScriptCore/WeakGCSetInlines.h>
+#include "JavaScriptCore/ExceptionHelpers.h"
+#include "JavaScriptCore/GCIncomingRefCountedInlines.h"
+#include "JavaScriptCore/HeapInlines.h"
+#include "JavaScriptCore/IdentifierInlines.h"
+#include "JavaScriptCore/JSArrayBufferViewInlines.h"
+#include "JavaScriptCore/JSCJSValueInlines.h"
+#include "JavaScriptCore/JSCellInlines.h"
+#include "JavaScriptCore/JSFunctionInlines.h"
+#include "JavaScriptCore/JSGlobalObjectInlines.h"
+#include "JavaScriptCore/JSObjectInlines.h"
+#include "JavaScriptCore/JSProxy.h"
+#include "JavaScriptCore/JSString.h"
+#include "JavaScriptCore/Operations.h"
+#include "JavaScriptCore/SlotVisitorInlines.h"
+#include "JavaScriptCore/StrongInlines.h"
+#include "JavaScriptCore/StructureInlines.h"
+#include "JavaScriptCore/ThrowScope.h"
+#include "JavaScriptCore/WeakGCMapInlines.h"
+#include "JavaScriptCore/WeakGCSetInlines.h"
diff --git a/src/javascript/jsc/bindings/JSDOMBinding.h b/src/javascript/jsc/bindings/JSDOMBinding.h
new file mode 100644
index 000000000..dc2096f2b
--- /dev/null
+++ b/src/javascript/jsc/bindings/JSDOMBinding.h
@@ -0,0 +1,21 @@
+#pragma once
+
+#include "root.h"
+
+#include "ExceptionOr.h"
+#include "JavaScriptCore/AuxiliaryBarrierInlines.h"
+#include "JavaScriptCore/HeapInlines.h"
+#include "JavaScriptCore/JSArray.h"
+#include "JavaScriptCore/JSCJSValueInlines.h"
+#include "JavaScriptCore/JSCellInlines.h"
+#include "JavaScriptCore/JSObjectInlines.h"
+#include "JavaScriptCore/Lookup.h"
+#include "JavaScriptCore/ObjectConstructor.h"
+#include "JavaScriptCore/SlotVisitorInlines.h"
+#include "JavaScriptCore/StructureInlines.h"
+#include "JavaScriptCore/WriteBarrier.h"
+#include "wtf/Forward.h"
+#include "wtf/GetPtr.h"
+#include "wtf/Vector.h"
+#include <cstddef>
+#include "JavaScriptCore/WeakHandleOwner.h"
\ No newline at end of file
diff --git a/src/javascript/jsc/bindings/JSDOMExceptionHandling.cpp b/src/javascript/jsc/bindings/JSDOMExceptionHandling.cpp
index 84f387bef..70f3c4d87 100644
--- a/src/javascript/jsc/bindings/JSDOMExceptionHandling.cpp
+++ b/src/javascript/jsc/bindings/JSDOMExceptionHandling.cpp
@@ -25,11 +25,11 @@
 #include "JSDOMException.h"
 #include "JSDOMExceptionHandling.h"
 
-#include <JavaScriptCore/ErrorHandlingScope.h>
-#include <JavaScriptCore/Exception.h>
-#include <JavaScriptCore/ExceptionHelpers.h>
-#include <JavaScriptCore/ScriptCallStack.h>
-#include <JavaScriptCore/ScriptCallStackFactory.h>
+#include "JavaScriptCore/ErrorHandlingScope.h"
+#include "JavaScriptCore/Exception.h"
+#include "JavaScriptCore/ExceptionHelpers.h"
+#include "JavaScriptCore/ScriptCallStack.h"
+#include "JavaScriptCore/ScriptCallStackFactory.h"
 
 namespace WebCore {
 using namespace JSC;
@@ -76,7 +76,7 @@ void reportCurrentException(JSGlobalObject* lexicalGlobalObject)
     auto scope = DECLARE_CATCH_SCOPE(vm);
     auto* exception = scope.exception();
     scope.clearException();
-    reportException(lexicalGlobalObject, exception);
+    // reportException(lexicalGlobalObject, exception);
 }
 
 JSValue createDOMException(JSGlobalObject* lexicalGlobalObject, ExceptionCode ec, const String& message)
@@ -116,7 +116,7 @@ JSValue createDOMException(JSGlobalObject* lexicalGlobalObject, ExceptionCode ec
         // For now, we're going to assume the lexicalGlobalObject. Which is wrong in cases like this:
         // frames[0].document.createElement(null, null); // throws an exception which should have the subframe's prototypes.
         // https://bugs.webkit.org/show_bug.cgi?id=222229
-        JSDOMGlobalObject* globalObject = deprecatedGlobalObjectForPrototype(lexicalGlobalObject);
+        JSDOMGlobalObject* globalObject = JSC::jsCast<JSDOMGlobalObject*>(lexicalGlobalObject);
         JSValue errorObject = toJS(lexicalGlobalObject, globalObject, DOMException::create(ec, message));
 
         ASSERT(errorObject);
@@ -214,10 +214,10 @@ void throwNonFiniteTypeError(JSGlobalObject& lexicalGlobalObject, JSC::ThrowScop
     throwTypeError(&lexicalGlobalObject, scope, "The provided value is non-finite"_s);
 }
 
-JSC::EncodedJSValue rejectPromiseWithGetterTypeError(JSC::JSGlobalObject& lexicalGlobalObject, const JSC::ClassInfo* classInfo, JSC::PropertyName attributeName)
-{
-    return createRejectedPromiseWithTypeError(lexicalGlobalObject, JSC::makeDOMAttributeGetterTypeErrorMessage(classInfo->className, String(attributeName.uid())), RejectedPromiseWithTypeErrorCause::NativeGetter);
-}
+// JSC::EncodedJSValue rejectPromiseWithGetterTypeError(JSC::JSGlobalObject& lexicalGlobalObject, const JSC::ClassInfo* classInfo, JSC::PropertyName attributeName)
+// {
+//     return createRejectedPromiseWithTypeError(lexicalGlobalObject, JSC::makeDOMAttributeGetterTypeErrorMessage(classInfo->className, String(attributeName.uid())), RejectedPromiseWithTypeErrorCause::NativeGetter);
+// }
 
 String makeThisTypeErrorMessage(const char* interfaceName, const char* functionName)
 {
@@ -234,16 +234,16 @@ EncodedJSValue throwThisTypeError(JSC::JSGlobalObject& lexicalGlobalObject, JSC:
     return throwTypeError(lexicalGlobalObject, scope, makeThisTypeErrorMessage(interfaceName, functionName));
 }
 
-JSC::EncodedJSValue rejectPromiseWithThisTypeError(DeferredPromise& promise, const char* interfaceName, const char* methodName)
-{
-    promise.reject(TypeError, makeThisTypeErrorMessage(interfaceName, methodName));
-    return JSValue::encode(jsUndefined());
-}
+// JSC::EncodedJSValue rejectPromiseWithThisTypeError(DeferredPromise& promise, const char* interfaceName, const char* methodName)
+// {
+//     promise.reject(TypeError, makeThisTypeErrorMessage(interfaceName, methodName));
+//     return JSValue::encode(jsUndefined());
+// }
 
-JSC::EncodedJSValue rejectPromiseWithThisTypeError(JSC::JSGlobalObject& lexicalGlobalObject, const char* interfaceName, const char* methodName)
-{
-    return createRejectedPromiseWithTypeError(lexicalGlobalObject, makeThisTypeErrorMessage(interfaceName, methodName), RejectedPromiseWithTypeErrorCause::InvalidThis);
-}
+// JSC::EncodedJSValue rejectPromiseWithThisTypeError(JSC::JSGlobalObject& lexicalGlobalObject, const char* interfaceName, const char* methodName)
+// {
+//     return createRejectedPromiseWithTypeError(lexicalGlobalObject, makeThisTypeErrorMessage(interfaceName, methodName), RejectedPromiseWithTypeErrorCause::InvalidThis);
+// }
 
 void throwDOMSyntaxError(JSC::JSGlobalObject& lexicalGlobalObject, JSC::ThrowScope& scope, ASCIILiteral message)
 {
diff --git a/src/javascript/jsc/bindings/JSDOMExceptionHandling.h b/src/javascript/jsc/bindings/JSDOMExceptionHandling.h
index 275dc4032..e90f9aecf 100644
--- a/src/javascript/jsc/bindings/JSDOMExceptionHandling.h
+++ b/src/javascript/jsc/bindings/JSDOMExceptionHandling.h
@@ -23,9 +23,13 @@
 
 #pragma once
 
+#include "root.h"
+
+#include "JavaScriptCore/WeakHandleOwner.h"
+
 #include "ExceptionDetails.h"
 #include "ExceptionOr.h"
-#include <JavaScriptCore/ThrowScope.h>
+#include "JavaScriptCore/ThrowScope.h"
 
 namespace JSC {
 class CatchScope;
@@ -35,7 +39,6 @@ namespace WebCore {
 
 class CachedScript;
 class DeferredPromise;
-class JSDOMGlobalObject;
 
 void throwAttributeTypeError(JSC::JSGlobalObject&, JSC::ThrowScope&, const char* interfaceName, const char* attributeName, const char* expectedType);
 
@@ -59,9 +62,9 @@ String makeUnsupportedIndexedSetterErrorMessage(const char* interfaceName);
 
 WEBCORE_EXPORT JSC::EncodedJSValue throwThisTypeError(JSC::JSGlobalObject&, JSC::ThrowScope&, const char* interfaceName, const char* functionName);
 
-WEBCORE_EXPORT JSC::EncodedJSValue rejectPromiseWithGetterTypeError(JSC::JSGlobalObject&, const JSC::ClassInfo*, JSC::PropertyName attributeName);
-WEBCORE_EXPORT JSC::EncodedJSValue rejectPromiseWithThisTypeError(DeferredPromise&, const char* interfaceName, const char* operationName);
-WEBCORE_EXPORT JSC::EncodedJSValue rejectPromiseWithThisTypeError(JSC::JSGlobalObject&, const char* interfaceName, const char* operationName);
+// WEBCORE_EXPORT JSC::EncodedJSValue rejectPromiseWithGetterTypeError(JSC::JSGlobalObject&, const JSC::ClassInfo*, JSC::PropertyName attributeName);
+// WEBCORE_EXPORT JSC::EncodedJSValue rejectPromiseWithThisTypeError(DeferredPromise&, const char* interfaceName, const char* operationName);
+// WEBCORE_EXPORT JSC::EncodedJSValue rejectPromiseWithThisTypeError(JSC::JSGlobalObject&, const char* interfaceName, const char* operationName);
 
 String retrieveErrorMessageWithoutName(JSC::JSGlobalObject&, JSC::VM&, JSC::JSValue exception, JSC::CatchScope&);
 String retrieveErrorMessage(JSC::JSGlobalObject&, JSC::VM&, JSC::JSValue exception, JSC::CatchScope&);
@@ -88,6 +91,12 @@ inline void propagateException(JSC::JSGlobalObject& lexicalGlobalObject, JSC::Th
         propagateException(lexicalGlobalObject, throwScope, value.releaseException());
 }
 
+inline void propagateException(JSC::JSGlobalObject* lexicalGlobalObject, JSC::ThrowScope& throwScope, ExceptionOr<void>&& value)
+{
+    if (UNLIKELY(value.hasException()))
+        propagateException(lexicalGlobalObject, throwScope, value.releaseException());
+}
+
 template<typename Functor> void invokeFunctorPropagatingExceptionIfNecessary(JSC::JSGlobalObject& lexicalGlobalObject, JSC::ThrowScope& throwScope, Functor&& functor)
 {
     using ReturnType = std::invoke_result_t<Functor>;
@@ -100,4 +109,16 @@ template<typename Functor> void invokeFunctorPropagatingExceptionIfNecessary(JSC
         functor();
 }
 
+template<typename Functor> void invokeFunctorPropagatingExceptionIfNecessary(JSC::JSGlobalObject* lexicalGlobalObject, JSC::ThrowScope& throwScope, Functor&& functor)
+{
+    using ReturnType = std::invoke_result_t<Functor>;
+
+    if constexpr (IsExceptionOr<ReturnType>) {
+        auto result = functor();
+        if (UNLIKELY(result.hasException()))
+            propagateException(lexicalGlobalObject, throwScope, result.releaseException());
+    } else
+        functor();
+}
+
 } // namespace WebCore
diff --git a/src/javascript/jsc/bindings/JSDOMGlobalObject.cpp b/src/javascript/jsc/bindings/JSDOMGlobalObject.cpp
new file mode 100644
index 000000000..98b9e9dec
--- /dev/null
+++ b/src/javascript/jsc/bindings/JSDOMGlobalObject.cpp
@@ -0,0 +1,82 @@
+#include "JSDOMGlobalObject.h"
+#include "JavaScriptCore/JSCast.h"
+#include "ZigGlobalObject.h"
+
+namespace WebCore {
+
+// static JSDOMGlobalObject& callerGlobalObject(JSC::JSGlobalObject& lexicalGlobalObject, JSC::CallFrame* callFrame, bool skipFirstFrame, bool lookUpFromVMEntryScope)
+// {
+//     VM& vm = lexicalGlobalObject.vm();
+//     if (callFrame) {
+//         class GetCallerGlobalObjectFunctor {
+//         public:
+//             GetCallerGlobalObjectFunctor(bool skipFirstFrame)
+//                 : m_skipFirstFrame(skipFirstFrame)
+//             {
+//             }
+
+//             StackVisitor::Status operator()(StackVisitor& visitor) const
+//             {
+//                 if (m_skipFirstFrame) {
+//                     if (!m_hasSkippedFirstFrame) {
+//                         m_hasSkippedFirstFrame = true;
+//                         return StackVisitor::Continue;
+//                     }
+//                 }
+
+//                 if (auto* codeBlock = visitor->codeBlock())
+//                     m_globalObject = codeBlock->globalObject();
+//                 else {
+//                     ASSERT(visitor->callee().rawPtr());
+//                     // FIXME: Callee is not an object if the caller is Web Assembly.
+//                     // Figure out what to do here. We can probably get the global object
+//                     // from the top-most Wasm Instance. https://bugs.webkit.org/show_bug.cgi?id=165721
+//                     if (visitor->callee().isCell() && visitor->callee().asCell()->isObject())
+//                         m_globalObject = jsCast<JSObject*>(visitor->callee().asCell())->globalObject();
+//                 }
+//                 return StackVisitor::Done;
+//             }
+
+//             JSC::JSGlobalObject* globalObject() const { return m_globalObject; }
+
+//         private:
+//             bool m_skipFirstFrame { false };
+//             mutable bool m_hasSkippedFirstFrame { false };
+//             mutable JSC::JSGlobalObject* m_globalObject { nullptr };
+//         };
+
+//         GetCallerGlobalObjectFunctor iter(skipFirstFrame);
+//         callFrame->iterate(vm, iter);
+//         if (iter.globalObject())
+//             return *jsCast<JSDOMGlobalObject*>(iter.globalObject());
+//     }
+
+//     // In the case of legacyActiveGlobalObjectForAccessor, it is possible that vm.topCallFrame is nullptr when the script is evaluated as JSONP.
+//     // Since we put JSGlobalObject to VMEntryScope, we can retrieve the right globalObject from that.
+//     // For callerGlobalObject, we do not check vm.entryScope to keep it the old behavior.
+//     if (lookUpFromVMEntryScope) {
+//         if (vm.entryScope) {
+//             if (auto* result = vm.entryScope->globalObject())
+//                 return *jsCast<JSDOMGlobalObject*>(result);
+//         }
+//     }
+
+//     // If we cannot find JSGlobalObject in caller frames, we just return the current lexicalGlobalObject.
+//     return *jsCast<JSDOMGlobalObject*>(&lexicalGlobalObject);
+// }
+
+// JSDOMGlobalObject& callerGlobalObject(JSC::JSGlobalObject& lexicalGlobalObject, JSC::CallFrame* callFrame)
+// {
+//     constexpr bool skipFirstFrame = true;
+//     constexpr bool lookUpFromVMEntryScope = false;
+//     return callerGlobalObject(lexicalGlobalObject, callFrame, skipFirstFrame, lookUpFromVMEntryScope);
+// }
+
+// JSDOMGlobalObject& legacyActiveGlobalObjectForAccessor(JSC::JSGlobalObject& lexicalGlobalObject, JSC::CallFrame* callFrame)
+// {
+//     constexpr bool skipFirstFrame = false;
+//     constexpr bool lookUpFromVMEntryScope = true;
+//     return callerGlobalObject(lexicalGlobalObject, callFrame, skipFirstFrame, lookUpFromVMEntryScope);
+// }
+
+}
\ No newline at end of file
diff --git a/src/javascript/jsc/bindings/JSDOMGlobalObject.h b/src/javascript/jsc/bindings/JSDOMGlobalObject.h
new file mode 100644
index 000000000..fe2c09954
--- /dev/null
+++ b/src/javascript/jsc/bindings/JSDOMGlobalObject.h
@@ -0,0 +1,33 @@
+#pragma once
+
+#include "root.h"
+
+#include "DOMWrapperWorld.h"
+
+#include "JavaScriptCore/HeapInlines.h"
+#include "JavaScriptCore/JSGlobalObject.h"
+#include "JavaScriptCore/JSObjectInlines.h"
+#include "JavaScriptCore/WeakGCMap.h"
+
+namespace WebCore {
+
+// Zig::GlobalObject* toJSDOMGlobalObject(ScriptExecutionContext&, DOMWrapperWorld&);
+WEBCORE_EXPORT Zig::GlobalObject& callerGlobalObject(JSC::JSGlobalObject&, JSC::CallFrame*);
+Zig::GlobalObject& legacyActiveGlobalObjectForAccessor(JSC::JSGlobalObject&, JSC::CallFrame*);
+
+template<class JSClass>
+JSClass* toJSDOMGlobalObject(JSC::VM& vm, JSC::JSValue value)
+{
+    // static_assert(std::is_base_of_v<JSDOMGlobalObject, JSClass>);
+
+    if (auto* object = value.getObject()) {
+        if (object->type() == JSC::PureForwardingProxyType)
+            return JSC::jsDynamicCast<JSClass*>(vm, JSC::jsCast<JSC::JSProxy*>(object)->target());
+        if (object->inherits<JSClass>(vm))
+            return JSC::jsCast<JSClass*>(object);
+    }
+
+    return nullptr;
+}
+
+}
\ No newline at end of file
diff --git a/src/javascript/jsc/bindings/JSDOMURL.cpp b/src/javascript/jsc/bindings/JSDOMURL.cpp
deleted file mode 100644
index 05a77957e..000000000
--- a/src/javascript/jsc/bindings/JSDOMURL.cpp
+++ /dev/null
@@ -1,321 +0,0 @@
-#include "root.h"
-
-#include "JSDOMURL.h"
-#include <JavaScriptCore/JSMicrotask.h>
-#include <JavaScriptCore/ObjectConstructor.h>
-
-namespace WebCore {
-using namespace JSC;
-using namespace Bun;
-using JSGlobalObject = JSC::JSGlobalObject;
-using JSValue = JSC::JSValue;
-using JSString = JSC::JSString;
-using JSModuleLoader = JSC::JSModuleLoader;
-using JSModuleRecord = JSC::JSModuleRecord;
-using Identifier = JSC::Identifier;
-using SourceOrigin = JSC::SourceOrigin;
-using JSObject = JSC::JSObject;
-using JSNonFinalObject = JSC::JSNonFinalObject;
-namespace JSCastingHelpers = JSC::JSCastingHelpers;
-
-JSC_DEFINE_CUSTOM_GETTER(DOMURL__href_get, (JSC::JSGlobalObject * lexicalGlobalObject, JSC::EncodedJSValue thisValue, JSC::PropertyName))
-{
-    auto* thisObject = JSC::jsDynamicCast<JSDOMURL*>(lexicalGlobalObject->vm(), JSC::JSValue::decode(thisValue));
-    auto& vm = JSC::getVM(lexicalGlobalObject);
-    auto throwScope = DECLARE_THROW_SCOPE(vm);
-    auto& impl = thisObject->wrapped();
-    RETURN_IF_EXCEPTION(throwScope, {});
-
-    return JSValue::encode(JSC::jsStringWithCache(vm, impl.href().string()));
-}
-
-JSC_DEFINE_CUSTOM_GETTER(DOMURL__protocol_get, (JSC::JSGlobalObject * lexicalGlobalObject, JSC::EncodedJSValue thisValue, JSC::PropertyName))
-{
-    auto* thisObject = JSC::jsDynamicCast<JSDOMURL*>(lexicalGlobalObject->vm(), JSC::JSValue::decode(thisValue));
-    auto& vm = JSC::getVM(lexicalGlobalObject);
-    auto throwScope = DECLARE_THROW_SCOPE(vm);
-    auto& impl = thisObject->wrapped();
-    RETURN_IF_EXCEPTION(throwScope, {});
-
-    return JSValue::encode(JSC::jsStringWithCache(vm, impl.protocol()));
-}
-JSC_DEFINE_CUSTOM_GETTER(DOMURL__username_get, (JSC::JSGlobalObject * lexicalGlobalObject, JSC::EncodedJSValue thisValue, JSC::PropertyName))
-{
-    auto* thisObject = JSC::jsDynamicCast<JSDOMURL*>(lexicalGlobalObject->vm(), JSC::JSValue::decode(thisValue));
-    auto& vm = JSC::getVM(lexicalGlobalObject);
-    auto throwScope = DECLARE_THROW_SCOPE(vm);
-    auto& impl = thisObject->wrapped();
-    RETURN_IF_EXCEPTION(throwScope, {});
-    return JSValue::encode(JSC::jsStringWithCache(vm, impl.username()));
-}
-JSC_DEFINE_CUSTOM_GETTER(DOMURL__password_get, (JSC::JSGlobalObject * lexicalGlobalObject, JSC::EncodedJSValue thisValue, JSC::PropertyName))
-{
-    auto* thisObject = JSC::jsDynamicCast<JSDOMURL*>(lexicalGlobalObject->vm(), JSC::JSValue::decode(thisValue));
-    auto& vm = JSC::getVM(lexicalGlobalObject);
-    auto throwScope = DECLARE_THROW_SCOPE(vm);
-    auto& impl = thisObject->wrapped();
-    RETURN_IF_EXCEPTION(throwScope, {});
-    return JSValue::encode(JSC::jsStringWithCache(vm, impl.password()));
-}
-JSC_DEFINE_CUSTOM_GETTER(DOMURL__host_get, (JSC::JSGlobalObject * lexicalGlobalObject, JSC::EncodedJSValue thisValue, JSC::PropertyName))
-{
-    auto* thisObject = JSC::jsDynamicCast<JSDOMURL*>(lexicalGlobalObject->vm(), JSC::JSValue::decode(thisValue));
-    auto& vm = JSC::getVM(lexicalGlobalObject);
-    auto throwScope = DECLARE_THROW_SCOPE(vm);
-    auto& impl = thisObject->wrapped();
-    RETURN_IF_EXCEPTION(throwScope, {});
-    return JSValue::encode(JSC::jsStringWithCache(vm, impl.host()));
-}
-JSC_DEFINE_CUSTOM_GETTER(DOMURL__hostname_get, (JSC::JSGlobalObject * lexicalGlobalObject, JSC::EncodedJSValue thisValue, JSC::PropertyName))
-{
-    auto* thisObject = JSC::jsDynamicCast<JSDOMURL*>(lexicalGlobalObject->vm(), JSC::JSValue::decode(thisValue));
-    auto& vm = JSC::getVM(lexicalGlobalObject);
-    auto throwScope = DECLARE_THROW_SCOPE(vm);
-    auto& impl = thisObject->wrapped();
-    RETURN_IF_EXCEPTION(throwScope, {});
-    return JSValue::encode(JSC::jsStringWithCache(vm, impl.hostname()));
-}
-JSC_DEFINE_CUSTOM_GETTER(DOMURL__port_get, (JSC::JSGlobalObject * lexicalGlobalObject, JSC::EncodedJSValue thisValue, JSC::PropertyName))
-{
-    auto* thisObject = JSC::jsDynamicCast<JSDOMURL*>(lexicalGlobalObject->vm(), JSC::JSValue::decode(thisValue));
-    auto& vm = JSC::getVM(lexicalGlobalObject);
-    auto throwScope = DECLARE_THROW_SCOPE(vm);
-    auto& impl = thisObject->wrapped();
-    RETURN_IF_EXCEPTION(throwScope, {});
-    return JSValue::encode(JSC::jsStringWithCache(vm, impl.port()));
-}
-JSC_DEFINE_CUSTOM_GETTER(DOMURL__pathname_get, (JSC::JSGlobalObject * lexicalGlobalObject, JSC::EncodedJSValue thisValue, JSC::PropertyName))
-{
-    auto* thisObject = JSC::jsDynamicCast<JSDOMURL*>(lexicalGlobalObject->vm(), JSC::JSValue::decode(thisValue));
-    auto& vm = JSC::getVM(lexicalGlobalObject);
-    auto throwScope = DECLARE_THROW_SCOPE(vm);
-    auto& impl = thisObject->wrapped();
-    RETURN_IF_EXCEPTION(throwScope, {});
-    return JSValue::encode(JSC::jsStringWithCache(vm, impl.pathname()));
-}
-JSC_DEFINE_CUSTOM_GETTER(DOMURL__hash_get, (JSC::JSGlobalObject * lexicalGlobalObject, JSC::EncodedJSValue thisValue, JSC::PropertyName))
-{
-    auto* thisObject = JSC::jsDynamicCast<JSDOMURL*>(lexicalGlobalObject->vm(), JSC::JSValue::decode(thisValue));
-    auto& vm = JSC::getVM(lexicalGlobalObject);
-    auto throwScope = DECLARE_THROW_SCOPE(vm);
-    auto& impl = thisObject->wrapped();
-    RETURN_IF_EXCEPTION(throwScope, {});
-    return JSValue::encode(JSC::jsStringWithCache(vm, impl.hash()));
-}
-
-JSC_DEFINE_CUSTOM_GETTER(DOMURL__search_get, (JSC::JSGlobalObject * lexicalGlobalObject, JSC::EncodedJSValue thisValue, JSC::PropertyName))
-{
-    auto* thisObject = JSC::jsDynamicCast<JSDOMURL*>(lexicalGlobalObject->vm(), JSC::JSValue::decode(thisValue));
-    auto& vm = JSC::getVM(lexicalGlobalObject);
-    auto throwScope = DECLARE_THROW_SCOPE(vm);
-    auto& impl = thisObject->wrapped();
-    RETURN_IF_EXCEPTION(throwScope, {});
-    return JSValue::encode(JSC::jsStringWithCache(vm, impl.search()));
-}
-
-JSC_DEFINE_CUSTOM_SETTER(DOMURL__protocol_set,
-    (JSC::JSGlobalObject * lexicalGlobalObject, JSC::EncodedJSValue thisValue,
-        JSC::EncodedJSValue value, JSC::PropertyName))
-{
-    auto* thisObject = JSC::jsDynamicCast<JSDOMURL*>(lexicalGlobalObject->vm(), JSC::JSValue::decode(thisValue));
-    auto& vm = JSC::getVM(lexicalGlobalObject);
-    auto throwScope = DECLARE_THROW_SCOPE(vm);
-    auto& impl = thisObject->wrapped();
-    invokeFunctorPropagatingExceptionIfNecessary(lexicalGlobalObject, throwScope, [&] {
-        return impl.setProtocol(JSC::JSValue::decode(value).toWTFString(lexicalGlobalObject));
-    });
-
-    return true;
-}
-JSC_DEFINE_CUSTOM_SETTER(DOMURL__username_set,
-    (JSC::JSGlobalObject * lexicalGlobalObject, JSC::EncodedJSValue thisValue,
-        JSC::EncodedJSValue value, JSC::PropertyName))
-{
-    auto* thisObject = JSC::jsDynamicCast<JSDOMURL*>(lexicalGlobalObject->vm(), JSC::JSValue::decode(thisValue));
-    auto& vm = JSC::getVM(lexicalGlobalObject);
-    auto throwScope = DECLARE_THROW_SCOPE(vm);
-    auto& impl = thisObject->wrapped();
-
-    invokeFunctorPropagatingExceptionIfNecessary(lexicalGlobalObject, throwScope, [&] {
-        return impl.setUsername(JSC::JSValue::decode(value).toWTFString(lexicalGlobalObject));
-    });
-
-    return true;
-}
-
-JSC_DEFINE_CUSTOM_SETTER(DOMURL__href_set,
-    (JSC::JSGlobalObject * lexicalGlobalObject, JSC::EncodedJSValue thisValue,
-        JSC::EncodedJSValue value, JSC::PropertyName))
-{
-    auto* thisObject = JSC::jsDynamicCast<JSDOMURL*>(lexicalGlobalObject->vm(), JSC::JSValue::decode(thisValue));
-    auto& vm = JSC::getVM(lexicalGlobalObject);
-    auto throwScope = DECLARE_THROW_SCOPE(vm);
-    auto& impl = thisObject->wrapped();
-
-    invokeFunctorPropagatingExceptionIfNecessary(lexicalGlobalObject, throwScope, [&] {
-        return impl.setHref(JSC::JSValue::decode(value).toWTFString(lexicalGlobalObject));
-    });
-
-    return true;
-}
-
-JSC_DEFINE_CUSTOM_SETTER(DOMURL__password_set,
-    (JSC::JSGlobalObject * lexicalGlobalObject, JSC::EncodedJSValue thisValue,
-        JSC::EncodedJSValue value, JSC::PropertyName))
-{
-    auto* thisObject = JSC::jsDynamicCast<JSDOMURL*>(lexicalGlobalObject->vm(), JSC::JSValue::decode(thisValue));
-    auto& vm = JSC::getVM(lexicalGlobalObject);
-    auto throwScope = DECLARE_THROW_SCOPE(vm);
-    auto& impl = thisObject->wrapped();
-    invokeFunctorPropagatingExceptionIfNecessary(lexicalGlobalObject, throwScope, [&] {
-        return impl.setPassword(JSC::JSValue::decode(value).toWTFString(lexicalGlobalObject));
-    });
-
-    return true;
-}
-JSC_DEFINE_CUSTOM_SETTER(DOMURL__host_set,
-    (JSC::JSGlobalObject * lexicalGlobalObject, JSC::EncodedJSValue thisValue,
-        JSC::EncodedJSValue value, JSC::PropertyName))
-{
-    auto* thisObject = JSC::jsDynamicCast<JSDOMURL*>(lexicalGlobalObject->vm(), JSC::JSValue::decode(thisValue));
-    auto& vm = JSC::getVM(lexicalGlobalObject);
-    auto throwScope = DECLARE_THROW_SCOPE(vm);
-    auto& impl = thisObject->wrapped();
-    invokeFunctorPropagatingExceptionIfNecessary(lexicalGlobalObject, throwScope, [&] {
-        return impl.setHost(JSC::JSValue::decode(value).toWTFString(lexicalGlobalObject));
-    });
-
-    return true;
-}
-JSC_DEFINE_CUSTOM_SETTER(DOMURL__hostname_set,
-    (JSC::JSGlobalObject * lexicalGlobalObject, JSC::EncodedJSValue thisValue,
-        JSC::EncodedJSValue value, JSC::PropertyName))
-{
-    auto* thisObject = JSC::jsDynamicCast<JSDOMURL*>(lexicalGlobalObject->vm(), JSC::JSValue::decode(thisValue));
-    auto& vm = JSC::getVM(lexicalGlobalObject);
-    auto throwScope = DECLARE_THROW_SCOPE(vm);
-    auto& impl = thisObject->wrapped();
-    invokeFunctorPropagatingExceptionIfNecessary(lexicalGlobalObject, throwScope, [&] {
-        return impl.setHostname(JSC::JSValue::decode(value).toWTFString(lexicalGlobalObject));
-    });
-
-    return true;
-}
-JSC_DEFINE_CUSTOM_SETTER(DOMURL__port_set,
-    (JSC::JSGlobalObject * lexicalGlobalObject, JSC::EncodedJSValue thisValue,
-        JSC::EncodedJSValue value, JSC::PropertyName))
-{
-    auto* thisObject = JSC::jsDynamicCast<JSDOMURL*>(lexicalGlobalObject->vm(), JSC::JSValue::decode(thisValue));
-    auto& vm = JSC::getVM(lexicalGlobalObject);
-    auto throwScope = DECLARE_THROW_SCOPE(vm);
-    auto& impl = thisObject->wrapped();
-    invokeFunctorPropagatingExceptionIfNecessary(lexicalGlobalObject, throwScope, [&] {
-        return impl.setPort(JSC::JSValue::decode(value).toWTFString(lexicalGlobalObject));
-    });
-
-    return true;
-}
-JSC_DEFINE_CUSTOM_SETTER(DOMURL__pathname_set,
-    (JSC::JSGlobalObject * lexicalGlobalObject, JSC::EncodedJSValue thisValue,
-        JSC::EncodedJSValue value, JSC::PropertyName))
-{
-    auto* thisObject = JSC::jsDynamicCast<JSDOMURL*>(lexicalGlobalObject->vm(), JSC::JSValue::decode(thisValue));
-    auto& vm = JSC::getVM(lexicalGlobalObject);
-    auto throwScope = DECLARE_THROW_SCOPE(vm);
-    auto& impl = thisObject->wrapped();
-    invokeFunctorPropagatingExceptionIfNecessary(lexicalGlobalObject, throwScope, [&] {
-        return impl.setPathname(JSC::JSValue::decode(value).toWTFString(lexicalGlobalObject));
-    });
-
-    return true;
-}
-JSC_DEFINE_CUSTOM_SETTER(DOMURL__hash_set,
-    (JSC::JSGlobalObject * lexicalGlobalObject, JSC::EncodedJSValue thisValue,
-        JSC::EncodedJSValue value, JSC::PropertyName))
-{
-    auto* thisObject = JSC::jsDynamicCast<JSDOMURL*>(lexicalGlobalObject->vm(), JSC::JSValue::decode(thisValue));
-    auto& vm = JSC::getVM(lexicalGlobalObject);
-    auto throwScope = DECLARE_THROW_SCOPE(vm);
-    auto& impl = thisObject->wrapped();
-    invokeFunctorPropagatingExceptionIfNecessary(lexicalGlobalObject, throwScope, [&] {
-        return impl.setHash(JSC::JSValue::decode(value).toWTFString(lexicalGlobalObject));
-    });
-
-    return true;
-}
-
-JSC_DEFINE_CUSTOM_SETTER(DOMURL__search_set,
-    (JSC::JSGlobalObject * lexicalGlobalObject, JSC::EncodedJSValue thisValue,
-        JSC::EncodedJSValue value, JSC::PropertyName))
-{
-    auto* thisObject = JSC::jsDynamicCast<JSDOMURL*>(lexicalGlobalObject->vm(), JSC::JSValue::decode(thisValue));
-    auto& vm = JSC::getVM(lexicalGlobalObject);
-    auto throwScope = DECLARE_THROW_SCOPE(vm);
-    auto& impl = thisObject->wrapped();
-    invokeFunctorPropagatingExceptionIfNecessary(lexicalGlobalObject, throwScope, [&] {
-        return impl.setSearch(JSC::JSValue::decode(value).toWTFString(lexicalGlobalObject));
-    });
-
-    return true;
-}
-
-void JSDOMURL::finishCreation(JSC::VM& vm)
-{
-    Base::finishCreation(vm);
-    auto clientData = Bun::clientData(vm);
-
-    putDirectCustomAccessor(vm, clientData->builtinNames().protocolPublicName(),
-        JSC::CustomGetterSetter::create(vm, DOMURL__protocol_get, DOMURL__protocol_set),
-        static_cast<unsigned>(JSC::PropertyAttribute::CustomValue));
-
-    putDirectCustomAccessor(vm, clientData->builtinNames().usernamePublicName(),
-        JSC::CustomGetterSetter::create(vm, DOMURL__username_get, DOMURL__username_set),
-        static_cast<unsigned>(JSC::PropertyAttribute::CustomValue));
-
-    putDirectCustomAccessor(vm, clientData->builtinNames().hrefPublicName(),
-        JSC::CustomGetterSetter::create(vm, DOMURL__href_get, DOMURL__href_set),
-        static_cast<unsigned>(JSC::PropertyAttribute::CustomValue));
-
-    putDirectCustomAccessor(vm, clientData->builtinNames().passwordPublicName(),
-        JSC::CustomGetterSetter::create(vm, DOMURL__password_get, DOMURL__password_set),
-        static_cast<unsigned>(JSC::PropertyAttribute::CustomValue));
-
-    putDirectCustomAccessor(vm, clientData->builtinNames().hostPublicName(),
-        JSC::CustomGetterSetter::create(vm, DOMURL__host_get, DOMURL__host_set),
-        static_cast<unsigned>(JSC::PropertyAttribute::CustomValue));
-
-    putDirectCustomAccessor(vm, clientData->builtinNames().hostnamePublicName(),
-        JSC::CustomGetterSetter::create(vm, DOMURL__hostname_get, DOMURL__hostname_set),
-        static_cast<unsigned>(JSC::PropertyAttribute::CustomValue));
-
-    putDirectCustomAccessor(vm, clientData->builtinNames().portPublicName(),
-        JSC::CustomGetterSetter::create(vm, DOMURL__port_get, DOMURL__port_set),
-        static_cast<unsigned>(JSC::PropertyAttribute::CustomValue));
-
-    putDirectCustomAccessor(vm, clientData->builtinNames().pathnamePublicName(),
-        JSC::CustomGetterSetter::create(vm, DOMURL__pathname_get, DOMURL__pathname_set),
-        static_cast<unsigned>(JSC::PropertyAttribute::CustomValue));
-
-    putDirectCustomAccessor(vm, clientData->builtinNames().hashPublicName(),
-        JSC::CustomGetterSetter::create(vm, DOMURL__hash_get, DOMURL__hash_set),
-        static_cast<unsigned>(JSC::PropertyAttribute::CustomValue));
-
-    putDirectCustomAccessor(vm, clientData->builtinNames().searchPublicName(),
-        JSC::CustomGetterSetter::create(vm, DOMURL__search_get, DOMURL__search_set),
-        static_cast<unsigned>(JSC::PropertyAttribute::CustomValue));
-}
-
-JSC::GCClient::IsoSubspace* JSDOMURL::subspaceForImpl(JSC::VM& vm)
-{
-    return Bun::subspaceForImpl<JSDOMURL, UseCustomHeapCellType::No>(
-        vm,
-        // this is a placeholder
-        [](auto& spaces) { return spaces.m_clientSubspaceForExposedToWorkerAndWindow.get(); },
-        [](auto& spaces, auto&& space) { spaces.m_clientSubspaceForExposedToWorkerAndWindow = WTFMove(space); },
-        [](auto& spaces) { return spaces.m_subspaceForExposedToWorkerAndWindow.get(); },
-        [](auto& spaces, auto&& space) { spaces.m_subspaceForExposedToWorkerAndWindow = WTFMove(space); });
-}
-
-const ClassInfo JSDOMURL::s_info = { "JSDOMURL", &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(JSDOMURL) };
-
-}
diff --git a/src/javascript/jsc/bindings/JSDOMURL.h b/src/javascript/jsc/bindings/JSDOMURL.h
deleted file mode 100644
index edbb280c4..000000000
--- a/src/javascript/jsc/bindings/JSDOMURL.h
+++ /dev/null
@@ -1,52 +0,0 @@
-#pragma once
-
-#include "BunBuiltinNames.h"
-#include "BunClientData.h"
-#include "DOMURL.h"
-#include "JSDOMWrapper.h"
-#include "root.h"
-
-namespace WebCore {
-
-using namespace WebCore;
-using namespace JSC;
-
-class JSDOMURL : public JSDOMWrapper<DOMURL> {
-    using Base = JSDOMWrapper<DOMURL>;
-
-public:
-    JSDOMURL(JSC::Structure* structure, JSC::JSGlobalObject& global, DOMURL& domURL)
-        : Base(structure, global, domURL)
-    {
-    }
-
-    DECLARE_INFO;
-
-    static constexpr unsigned StructureFlags = Base::StructureFlags;
-
-    template<typename, JSC::SubspaceAccess mode> static JSC::GCClient::IsoSubspace* subspaceFor(JSC::VM& vm)
-    {
-        if constexpr (mode == JSC::SubspaceAccess::Concurrently)
-            return nullptr;
-        return subspaceForImpl(vm);
-    }
-    static JSC::GCClient::IsoSubspace* subspaceForImpl(JSC::VM& vm);
-
-    static JSC::Structure* createStructure(JSC::VM& vm, JSC::JSGlobalObject* globalObject,
-        JSC::JSValue prototype)
-    {
-        return JSC::Structure::create(vm, globalObject, prototype,
-            JSC::TypeInfo(JSC::ObjectType, StructureFlags), info());
-    }
-
-    static JSDOMURL* create(JSC::Structure* structure, JSC::JSGlobalObject* global, Ref<DOMURL> domURL)
-    {
-        JSDOMURL* accessor = new (NotNull, JSC::allocateCell<JSDOMURL>(global->vm())) JSDOMURL(structure, *global, WTFMove(domURL));
-        accessor->finishCreation(global->vm());
-        return accessor;
-    }
-
-    void finishCreation(JSC::VM& vm);
-};
-
-} // namespace Zig
\ No newline at end of file
diff --git a/src/javascript/jsc/bindings/JSDOMWrapper.cpp b/src/javascript/jsc/bindings/JSDOMWrapper.cpp
index 5fbb4238e..e04bd59b4 100644
--- a/src/javascript/jsc/bindings/JSDOMWrapper.cpp
+++ b/src/javascript/jsc/bindings/JSDOMWrapper.cpp
@@ -33,7 +33,7 @@
 // #include "JSDOMWindow.h"
 // #include "JSRemoteDOMWindow.h"
 // #include "SerializedScriptValue.h"
-// #include <JavaScriptCore/Error.h>
+// #include "JavaScriptCore/Error.h"
 
 namespace WebCore {
 
diff --git a/src/javascript/jsc/bindings/JSDOMWrapper.h b/src/javascript/jsc/bindings/JSDOMWrapper.h
index ad374ec2d..a28174543 100644
--- a/src/javascript/jsc/bindings/JSDOMWrapper.h
+++ b/src/javascript/jsc/bindings/JSDOMWrapper.h
@@ -22,10 +22,11 @@
 #pragma once
 #include "root.h"
 
-#include "NodeConstants.h"
+#include "JSDOMGlobalObject.h"
 #include "ZigGlobalObject.h"
-#include <JavaScriptCore/JSDestructibleObject.h>
-#include <wtf/SignedPtr.h>
+#include "NodeConstants.h"
+#include "JavaScriptCore/JSDestructibleObject.h"
+#include "wtf/SignedPtr.h"
 
 namespace WebCore {
 using namespace Zig;
diff --git a/src/javascript/jsc/bindings/JSDOMWrapperCache.cpp b/src/javascript/jsc/bindings/JSDOMWrapperCache.cpp
new file mode 100644
index 000000000..305396b4a
--- /dev/null
+++ b/src/javascript/jsc/bindings/JSDOMWrapperCache.cpp
@@ -0,0 +1,49 @@
+/*
+ *  Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
+ *  Copyright (C) 2004-2011, 2013, 2016 Apple Inc. All rights reserved.
+ *  Copyright (C) 2007 Samuel Weinig <sam@webkit.org>
+ *  Copyright (C) 2013 Michael Pruett <michael@68k.org>
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include "root.h"
+
+#include "JSDOMWrapperCache.h"
+
+#include "JavaScriptCore/JSCInlines.h"
+
+namespace WebCore {
+using namespace JSC;
+
+Structure* getCachedDOMStructure(const JSDOMGlobalObject& globalObject, const ClassInfo* classInfo)
+{
+    return globalObject.structures().get(classInfo).get();
+}
+
+Structure* cacheDOMStructure(JSDOMGlobalObject& globalObject, Structure* structure, const ClassInfo* classInfo)
+{
+    auto addToStructures = [](JSDOMStructureMap& structures, JSDOMGlobalObject& globalObject, Structure* structure, const ClassInfo* classInfo) {
+        ASSERT(!structures.contains(classInfo));
+        return structures.set(classInfo, WriteBarrier<Structure>(globalObject.vm(), &globalObject, structure)).iterator->value.get();
+    };
+    if (globalObject.vm().heap.mutatorShouldBeFenced()) {
+        Locker locker { globalObject.gcLock() };
+        return addToStructures(globalObject.structures(), globalObject, structure, classInfo);
+    }
+    return addToStructures(globalObject.structures(NoLockingNecessary), globalObject, structure, classInfo);
+}
+
+} // namespace WebCore
diff --git a/src/javascript/jsc/bindings/JSDOMWrapperCache.h b/src/javascript/jsc/bindings/JSDOMWrapperCache.h
new file mode 100644
index 000000000..beeeb2654
--- /dev/null
+++ b/src/javascript/jsc/bindings/JSDOMWrapperCache.h
@@ -0,0 +1,227 @@
+/*
+ *  Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
+ *  Copyright (C) 2003-2006, 2008-2009, 2013, 2016 Apple Inc. All rights reserved.
+ *  Copyright (C) 2007 Samuel Weinig <sam@webkit.org>
+ *  Copyright (C) 2009 Google, Inc. All rights reserved.
+ *  Copyright (C) 2012 Ericsson AB. All rights reserved.
+ *  Copyright (C) 2013 Michael Pruett <michael@68k.org>
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#pragma once
+
+#include "DOMWrapperWorld.h"
+#include "JSDOMGlobalObject.h"
+#include "JSDOMWrapper.h"
+#include "ScriptWrappable.h"
+#include "ScriptWrappableInlines.h"
+#include "WebCoreTypedArrayController.h"
+#include "JavaScriptCore/JSArrayBuffer.h"
+#include "JavaScriptCore/TypedArrayInlines.h"
+#include "JavaScriptCore/Weak.h"
+#include "JavaScriptCore/WeakInlines.h"
+
+namespace WebCore {
+
+WEBCORE_EXPORT JSC::Structure* getCachedDOMStructure(const JSDOMGlobalObject&, const JSC::ClassInfo*);
+WEBCORE_EXPORT JSC::Structure* cacheDOMStructure(JSDOMGlobalObject&, JSC::Structure*, const JSC::ClassInfo*);
+
+template<typename WrapperClass> JSC::Structure* getDOMStructure(JSC::VM&, JSDOMGlobalObject&);
+template<typename WrapperClass> JSC::Structure* deprecatedGetDOMStructure(JSC::JSGlobalObject*);
+template<typename WrapperClass> JSC::JSObject* getDOMPrototype(JSC::VM&, JSC::JSGlobalObject*);
+
+JSC::WeakHandleOwner* wrapperOwner(DOMWrapperWorld&, JSC::ArrayBuffer*);
+void* wrapperKey(JSC::ArrayBuffer*);
+
+JSDOMObject* getInlineCachedWrapper(DOMWrapperWorld&, void*);
+JSDOMObject* getInlineCachedWrapper(DOMWrapperWorld&, ScriptWrappable*);
+JSC::JSArrayBuffer* getInlineCachedWrapper(DOMWrapperWorld&, JSC::ArrayBuffer*);
+
+bool setInlineCachedWrapper(DOMWrapperWorld&, void*, JSDOMObject*, JSC::WeakHandleOwner*);
+bool setInlineCachedWrapper(DOMWrapperWorld&, ScriptWrappable*, JSDOMObject* wrapper, JSC::WeakHandleOwner* wrapperOwner);
+bool setInlineCachedWrapper(DOMWrapperWorld&, JSC::ArrayBuffer*, JSC::JSArrayBuffer* wrapper, JSC::WeakHandleOwner* wrapperOwner);
+
+bool clearInlineCachedWrapper(DOMWrapperWorld&, void*, JSDOMObject*);
+bool clearInlineCachedWrapper(DOMWrapperWorld&, ScriptWrappable*, JSDOMObject* wrapper);
+bool clearInlineCachedWrapper(DOMWrapperWorld&, JSC::ArrayBuffer*, JSC::JSArrayBuffer* wrapper);
+
+template<typename DOMClass> JSC::JSObject* getOrCreateWrapper(DOMWrapperWorld&, DOMClass&);
+
+template<typename DOMClass> JSC::JSObject* getCachedWrapper(DOMWrapperWorld&, DOMClass&);
+template<typename DOMClass> inline JSC::JSObject* getCachedWrapper(DOMWrapperWorld& world, Ref<DOMClass>& object) { return getCachedWrapper(world, object.get()); }
+template<typename DOMClass, typename WrapperClass> void cacheWrapper(DOMWrapperWorld&, DOMClass*, WrapperClass*);
+template<typename DOMClass, typename WrapperClass> void uncacheWrapper(DOMWrapperWorld&, DOMClass*, WrapperClass*);
+template<typename DOMClass, typename T> auto createWrapper(JSDOMGlobalObject*, Ref<T>&&) -> typename std::enable_if<std::is_same<DOMClass, T>::value, typename JSDOMWrapperConverterTraits<DOMClass>::WrapperClass*>::type;
+template<typename DOMClass, typename T> auto createWrapper(JSDOMGlobalObject*, Ref<T>&&) -> typename std::enable_if<!std::is_same<DOMClass, T>::value, typename JSDOMWrapperConverterTraits<DOMClass>::WrapperClass*>::type;
+
+template<typename DOMClass> JSC::JSValue wrap(JSC::JSGlobalObject*, DOMWrapperWorld&, DOMClass&);
+template<typename DOMClass> JSC::JSValue wrap(JSC::JSGlobalObject*, JSDOMGlobalObject*, DOMClass&);
+
+// Inline functions and template definitions.
+
+inline JSDOMGlobalObject* deprecatedGlobalObjectForPrototype(JSC::JSGlobalObject* lexicalGlobalObject)
+{
+    // FIXME: Callers to this function should be using the global object
+    // from which the object is being created, instead of assuming the lexical one.
+    // e.g. subframe.document.body should use the subframe's global object, not the lexical one.
+    return JSC::jsCast<JSDOMGlobalObject*>(lexicalGlobalObject);
+}
+
+template<typename WrapperClass> inline JSC::Structure* getDOMStructure(JSC::VM& vm, JSDOMGlobalObject& globalObject)
+{
+    if (JSC::Structure* structure = getCachedDOMStructure(globalObject, WrapperClass::info()))
+        return structure;
+    return cacheDOMStructure(globalObject, WrapperClass::createStructure(vm, &globalObject, WrapperClass::createPrototype(vm, globalObject)), WrapperClass::info());
+}
+
+template<typename WrapperClass> inline JSC::Structure* deprecatedGetDOMStructure(JSC::JSGlobalObject* lexicalGlobalObject)
+{
+    // FIXME: This function is wrong. It uses the wrong global object for creating the prototype structure.
+    return getDOMStructure<WrapperClass>(JSC::getVM(lexicalGlobalObject), *deprecatedGlobalObjectForPrototype(lexicalGlobalObject));
+}
+
+template<typename WrapperClass> inline JSC::JSObject* getDOMPrototype(JSC::VM& vm, JSDOMGlobalObject& globalObject)
+{
+    return JSC::jsCast<JSC::JSObject*>(asObject(getDOMStructure<WrapperClass>(vm, globalObject)->storedPrototype()));
+}
+
+inline JSC::WeakHandleOwner* wrapperOwner(DOMWrapperWorld& world, JSC::ArrayBuffer*)
+{
+    return static_cast<WebCoreTypedArrayController*>(world.vm().m_typedArrayController.get())->wrapperOwner();
+}
+
+inline void* wrapperKey(JSC::ArrayBuffer* domObject)
+{
+    return domObject;
+}
+
+inline JSDOMObject* getInlineCachedWrapper(DOMWrapperWorld&, void*) { return nullptr; }
+inline bool setInlineCachedWrapper(DOMWrapperWorld&, void*, JSDOMObject*, JSC::WeakHandleOwner*) { return false; }
+inline bool clearInlineCachedWrapper(DOMWrapperWorld&, void*, JSDOMObject*) { return false; }
+
+inline JSDOMObject* getInlineCachedWrapper(DOMWrapperWorld& world, ScriptWrappable* domObject)
+{
+    if (!world.isNormal())
+        return nullptr;
+    return domObject->wrapper();
+}
+
+inline JSC::JSArrayBuffer* getInlineCachedWrapper(DOMWrapperWorld& world, JSC::ArrayBuffer* buffer)
+{
+    if (!world.isNormal())
+        return nullptr;
+    return buffer->m_wrapper.get();
+}
+
+inline bool setInlineCachedWrapper(DOMWrapperWorld& world, ScriptWrappable* domObject, JSDOMObject* wrapper, JSC::WeakHandleOwner* wrapperOwner)
+{
+    if (!world.isNormal())
+        return false;
+    domObject->setWrapper(wrapper, wrapperOwner, &world);
+    return true;
+}
+
+inline bool setInlineCachedWrapper(DOMWrapperWorld& world, JSC::ArrayBuffer* domObject, JSC::JSArrayBuffer* wrapper, JSC::WeakHandleOwner* wrapperOwner)
+{
+    if (!world.isNormal())
+        return false;
+    domObject->m_wrapper = JSC::Weak<JSC::JSArrayBuffer>(wrapper, wrapperOwner, &world);
+    return true;
+}
+
+inline bool clearInlineCachedWrapper(DOMWrapperWorld& world, ScriptWrappable* domObject, JSDOMObject* wrapper)
+{
+    if (!world.isNormal())
+        return false;
+    domObject->clearWrapper(wrapper);
+    return true;
+}
+
+inline bool clearInlineCachedWrapper(DOMWrapperWorld& world, JSC::ArrayBuffer* domObject, JSC::JSArrayBuffer* wrapper)
+{
+    if (!world.isNormal())
+        return false;
+    weakClear(domObject->m_wrapper, wrapper);
+    return true;
+}
+
+template<typename DOMClass> inline JSC::JSObject* getCachedWrapper(DOMWrapperWorld& world, DOMClass& domObject)
+{
+    if (auto* wrapper = getInlineCachedWrapper(world, &domObject))
+        return wrapper;
+    return world.wrappers().get(wrapperKey(&domObject));
+}
+
+template<typename DOMClass, typename WrapperClass> inline void cacheWrapper(DOMWrapperWorld& world, DOMClass* domObject, WrapperClass* wrapper)
+{
+    JSC::WeakHandleOwner* owner = wrapperOwner(world, domObject);
+    if (setInlineCachedWrapper(world, domObject, wrapper, owner))
+        return;
+    weakAdd(world.wrappers(), wrapperKey(domObject), JSC::Weak<JSC::JSObject>(wrapper, owner, &world));
+}
+
+template<typename DOMClass, typename WrapperClass> inline void uncacheWrapper(DOMWrapperWorld& world, DOMClass* domObject, WrapperClass* wrapper)
+{
+    if (clearInlineCachedWrapper(world, domObject, wrapper))
+        return;
+    weakRemove(world.wrappers(), wrapperKey(domObject), wrapper);
+}
+
+template<typename DOMClass, typename T> inline auto createWrapper(JSDOMGlobalObject* globalObject, Ref<T>&& domObject) -> typename std::enable_if<std::is_same<DOMClass, T>::value, typename JSDOMWrapperConverterTraits<DOMClass>::WrapperClass*>::type
+{
+    using WrapperClass = typename JSDOMWrapperConverterTraits<DOMClass>::WrapperClass;
+
+    ASSERT(!getCachedWrapper(globalObject->world(), domObject));
+    auto* domObjectPtr = domObject.ptr();
+    auto* wrapper = WrapperClass::create(getDOMStructure<WrapperClass>(globalObject->vm(), *globalObject), globalObject, WTFMove(domObject));
+    cacheWrapper(globalObject->world(), domObjectPtr, wrapper);
+    return wrapper;
+}
+
+template<typename DOMClass, typename T> inline auto createWrapper(JSDOMGlobalObject* globalObject, Ref<T>&& domObject) -> typename std::enable_if<!std::is_same<DOMClass, T>::value, typename JSDOMWrapperConverterTraits<DOMClass>::WrapperClass*>::type
+{
+    return createWrapper<DOMClass>(globalObject, static_reference_cast<DOMClass>(WTFMove(domObject)));
+}
+
+template<typename DOMClass> inline JSC::JSValue wrap(JSC::JSGlobalObject* lexicalGlobalObject, JSDOMGlobalObject* globalObject, DOMClass& domObject)
+{
+    if (auto* wrapper = getCachedWrapper(globalObject->world(), domObject))
+        return wrapper;
+    return toJSNewlyCreated(lexicalGlobalObject, globalObject, Ref<DOMClass>(domObject));
+}
+
+template<typename DOMClass> inline void setSubclassStructureIfNeeded(JSC::JSGlobalObject* lexicalGlobalObject, JSC::CallFrame* callFrame, JSC::JSObject* jsObject)
+{
+    JSC::JSObject* newTarget = callFrame->newTarget().getObject();
+    JSC::JSObject* constructor = callFrame->jsCallee();
+    if (!newTarget || newTarget == constructor)
+        return;
+
+    using WrapperClass = typename JSDOMWrapperConverterTraits<DOMClass>::WrapperClass;
+
+    JSC::VM& vm = lexicalGlobalObject->vm();
+    auto scope = DECLARE_THROW_SCOPE(vm);
+
+    auto* functionGlobalObject = JSC::getFunctionRealm(lexicalGlobalObject, newTarget);
+    RETURN_IF_EXCEPTION(scope, void());
+    auto* newTargetGlobalObject = JSC::jsCast<JSDOMGlobalObject*>(functionGlobalObject);
+    auto* baseStructure = getDOMStructure<WrapperClass>(vm, *newTargetGlobalObject);
+    auto* subclassStructure = JSC::InternalFunction::createSubclassStructure(lexicalGlobalObject, newTarget, baseStructure);
+    RETURN_IF_EXCEPTION(scope, void());
+    jsObject->setStructure(vm, subclassStructure);
+}
+
+} // namespace WebCore
diff --git a/src/javascript/jsc/bindings/Path.cpp b/src/javascript/jsc/bindings/Path.cpp
index 460cbebd3..7e5c51e92 100644
--- a/src/javascript/jsc/bindings/Path.cpp
+++ b/src/javascript/jsc/bindings/Path.cpp
@@ -1,8 +1,13 @@
-#include "BunClientData.h"
+
 #include "root.h"
-#include <JavaScriptCore/JSFunction.h>
-#include <JavaScriptCore/JSMicrotask.h>
-#include <JavaScriptCore/ObjectConstructor.h>
+
+#include "BunClientData.h"
+
+#include "JavaScriptCore/JSCInlines.h"
+
+#include "JavaScriptCore/JSFunction.h"
+#include "JavaScriptCore/JSMicrotask.h"
+#include "JavaScriptCore/ObjectConstructor.h"
 
 #pragma mark - Node.js Path
 
@@ -36,7 +41,7 @@ namespace JSCastingHelpers = JSC::JSCastingHelpers;
             arguments.uncheckedAppend(JSC::JSValue::encode(callFrame->uncheckedArgument(i))); \
         } \
      } \
-    auto clientData = Bun::clientData(vm); \
+    auto clientData = WebCore::clientData(vm); \
     auto isWindows = thisObject->get(globalObject, clientData->builtinNames().isWindowsPrivateName()); \
     JSC::JSValue result = JSC::JSValue::decode( \
         ZigFunction(globalObject, isWindows.asBoolean(), reinterpret_cast<JSC__JSValue*>(arguments.data()), argCount) \
@@ -127,7 +132,7 @@ static JSC::JSObject* createPath(JSGlobalObject* globalThis, bool isWindows)
     JSC::VM& vm = globalThis->vm();
     JSC::Structure* plainObjectStructure = JSC::JSFinalObject::createStructure(vm, globalThis, globalThis->objectPrototype(), 0);
     JSC::JSObject* path = JSC::JSFinalObject::create(vm, plainObjectStructure);
-    auto clientData = Bun::clientData(vm);
+    auto clientData = WebCore::clientData(vm);
 
     path->putDirect(vm, clientData->builtinNames().isWindowsPrivateName(),
         JSC::jsBoolean(isWindows), 0);
diff --git a/src/javascript/jsc/bindings/Process.cpp b/src/javascript/jsc/bindings/Process.cpp
index e910c4e26..fa0f37efc 100644
--- a/src/javascript/jsc/bindings/Process.cpp
+++ b/src/javascript/jsc/bindings/Process.cpp
@@ -1,6 +1,8 @@
 #include "Process.h"
-#include <JavaScriptCore/JSMicrotask.h>
-#include <JavaScriptCore/ObjectConstructor.h>
+#include "JavaScriptCore/JSMicrotask.h"
+#include "JavaScriptCore/ObjectConstructor.h"
+
+#include "JavaScriptCore/JSCInlines.h"
 
 #pragma mark - Node.js Process
 
@@ -145,7 +147,7 @@ static JSC_DEFINE_HOST_FUNCTION(Process_functionChdir,
 void Process::finishCreation(JSC::VM& vm)
 {
     Base::finishCreation(vm);
-    auto clientData = Bun::clientData(vm);
+    auto clientData = WebCore::clientData(vm);
 
     putDirectCustomAccessor(vm, clientData->builtinNames().pidPublicName(),
         JSC::CustomGetterSetter::create(vm, Process_getPID, nullptr),
@@ -223,7 +225,7 @@ void Process::finishCreation(JSC::VM& vm)
 #endif
 }
 
-const JSC::ClassInfo Process::s_info = { "Process", &Base::s_info, nullptr, nullptr,
+const JSC::ClassInfo Process::s_info = { "Process"_s, &Base::s_info, nullptr, nullptr,
     CREATE_METHOD_TABLE(Process) };
 
 JSC_DEFINE_CUSTOM_GETTER(Process_getTitle, (JSC::JSGlobalObject * globalObject, JSC::EncodedJSValue thisValue, JSC::PropertyName))
@@ -259,7 +261,7 @@ JSC_DEFINE_CUSTOM_GETTER(Process_getArgv, (JSC::JSGlobalObject * globalObject, J
     if (!thisObject) {
         return JSValue::encode(JSC::jsUndefined());
     }
-    auto clientData = Bun::clientData(vm);
+    auto clientData = WebCore::clientData(vm);
 
     if (JSC::JSValue argv = thisObject->getIfPropertyExists(
             globalObject, clientData->builtinNames().argvPrivateName())) {
@@ -284,7 +286,7 @@ JSC_DEFINE_CUSTOM_SETTER(Process_setArgv,
         return false;
     }
 
-    auto clientData = Bun::clientData(vm);
+    auto clientData = WebCore::clientData(vm);
 
     return thisObject->putDirect(vm, clientData->builtinNames().argvPrivateName(),
         JSC::JSValue::decode(value));
@@ -305,7 +307,7 @@ JSC_DEFINE_CUSTOM_GETTER(Process_getVersionsLazy,
         JSC::PropertyName))
 {
     JSC::VM& vm = globalObject->vm();
-    auto clientData = Bun::clientData(vm);
+    auto clientData = WebCore::clientData(vm);
 
     Zig::Process* thisObject = JSC::jsDynamicCast<Zig::Process*>(vm, JSValue::decode(thisValue));
     if (!thisObject) {
@@ -351,7 +353,7 @@ JSC_DEFINE_CUSTOM_SETTER(Process_setVersionsLazy,
 {
 
     JSC::VM& vm = globalObject->vm();
-    auto clientData = Bun::clientData(vm);
+    auto clientData = WebCore::clientData(vm);
 
     Zig::Process* thisObject = JSC::jsDynamicCast<Zig::Process*>(vm, JSValue::decode(thisValue));
     if (!thisObject) {
diff --git a/src/javascript/jsc/bindings/Process.h b/src/javascript/jsc/bindings/Process.h
index 5a4e7ec00..a710edbad 100644
--- a/src/javascript/jsc/bindings/Process.h
+++ b/src/javascript/jsc/bindings/Process.h
@@ -1,8 +1,9 @@
 #pragma once
 
+#include "root.h"
+
 #include "BunBuiltinNames.h"
 #include "BunClientData.h"
-#include "root.h"
 
 namespace Zig {
 
diff --git a/src/javascript/jsc/bindings/ScriptExecutionContext.h b/src/javascript/jsc/bindings/ScriptExecutionContext.h
new file mode 100644
index 000000000..e69de29bb
--- /dev/null
+++ b/src/javascript/jsc/bindings/ScriptExecutionContext.h
diff --git a/src/javascript/jsc/bindings/StringAdaptors.h b/src/javascript/jsc/bindings/StringAdaptors.h
index cceaa3a3b..28a732a42 100644
--- a/src/javascript/jsc/bindings/StringAdaptors.h
+++ b/src/javascript/jsc/bindings/StringAdaptors.h
@@ -25,7 +25,7 @@
 
 #pragma once
 
-#include <wtf/text/WTFString.h>
+#include "wtf/text/WTFString.h"
 
 namespace WebCore {
 
diff --git a/src/javascript/jsc/bindings/URLDecomposition.cpp b/src/javascript/jsc/bindings/URLDecomposition.cpp
index 2be72c0c6..db2bb7f81 100644
--- a/src/javascript/jsc/bindings/URLDecomposition.cpp
+++ b/src/javascript/jsc/bindings/URLDecomposition.cpp
@@ -25,7 +25,7 @@
 
 #include "URLDecomposition.h"
 
-#include <wtf/text/StringToIntegerConversion.h>
+#include "wtf/text/StringToIntegerConversion.h"
 
 namespace WebCore {
 
diff --git a/src/javascript/jsc/bindings/URLDecomposition.h b/src/javascript/jsc/bindings/URLDecomposition.h
index bf9473dcb..15ae09384 100644
--- a/src/javascript/jsc/bindings/URLDecomposition.h
+++ b/src/javascript/jsc/bindings/URLDecomposition.h
@@ -27,9 +27,9 @@
 
 #include "root.h"
 
-#include <wtf/URL.h>
+#include "wtf/URL.h"
 
-#include <wtf/Forward.h>
+#include "wtf/Forward.h"
 
 namespace WebCore {
 
diff --git a/src/javascript/jsc/bindings/URLSearchParams.cpp b/src/javascript/jsc/bindings/URLSearchParams.cpp
index 11d86bceb..0ce9554c7 100644
--- a/src/javascript/jsc/bindings/URLSearchParams.cpp
+++ b/src/javascript/jsc/bindings/URLSearchParams.cpp
@@ -25,7 +25,7 @@
 #include "URLSearchParams.h"
 
 #include "DOMURL.h"
-#include <wtf/URLParser.h>
+#include "wtf/URLParser.h"
 
 namespace WebCore {
 
diff --git a/src/javascript/jsc/bindings/URLSearchParams.h b/src/javascript/jsc/bindings/URLSearchParams.h
index a3c6c3171..3749ed9f9 100644
--- a/src/javascript/jsc/bindings/URLSearchParams.h
+++ b/src/javascript/jsc/bindings/URLSearchParams.h
@@ -26,10 +26,10 @@
 #include "root.h"
 
 #include "ExceptionOr.h"
+#include "wtf/Vector.h"
+#include "wtf/WeakPtr.h"
+#include "wtf/text/WTFString.h"
 #include <variant>
-#include <wtf/Vector.h>
-#include <wtf/WeakPtr.h>
-#include <wtf/text/WTFString.h>
 
 namespace WebCore {
 
diff --git a/src/javascript/jsc/bindings/ZigConsoleClient.cpp b/src/javascript/jsc/bindings/ZigConsoleClient.cpp
index 318c43e1c..9c025f078 100644
--- a/src/javascript/jsc/bindings/ZigConsoleClient.cpp
+++ b/src/javascript/jsc/bindings/ZigConsoleClient.cpp
@@ -1,13 +1,14 @@
 #include "helpers.h"
 
+#include "JavaScriptCore/ConsoleClient.h"
+#include "JavaScriptCore/ConsoleMessage.h"
+#include "JavaScriptCore/JSString.h"
+#include "JavaScriptCore/ScriptArguments.h"
 #include "ZigConsoleClient.h"
-#include <JavaScriptCore/ConsoleClient.h>
-#include <JavaScriptCore/ConsoleMessage.h>
-#include <JavaScriptCore/JSString.h>
-#include <JavaScriptCore/ScriptArguments.h>
-#include <wtf/text/WTFString.h>
+#include "wtf/text/WTFString.h"
 
 #include "GCDefferalContext.h"
+#include "JavaScriptCore/JSCInlines.h"
 
 using ScriptArguments = Inspector::ScriptArguments;
 using MessageType = JSC::MessageType;
diff --git a/src/javascript/jsc/bindings/ZigConsoleClient.h b/src/javascript/jsc/bindings/ZigConsoleClient.h
index f8c0731de..684e928fd 100644
--- a/src/javascript/jsc/bindings/ZigConsoleClient.h
+++ b/src/javascript/jsc/bindings/ZigConsoleClient.h
@@ -1,8 +1,8 @@
 #pragma once
 
-#include <JavaScriptCore/ConsoleClient.h>
-#include <wtf/Vector.h>
-#include <wtf/text/WTFString.h>
+#include "JavaScriptCore/ConsoleClient.h"
+#include "wtf/Vector.h"
+#include "wtf/text/WTFString.h"
 
 namespace Inspector {
 class InspectorConsoleAgent;
diff --git a/src/javascript/jsc/bindings/ZigGlobalObject.cpp b/src/javascript/jsc/bindings/ZigGlobalObject.cpp
index fd43fcaeb..c62457c32 100644
--- a/src/javascript/jsc/bindings/ZigGlobalObject.cpp
+++ b/src/javascript/jsc/bindings/ZigGlobalObject.cpp
@@ -1,81 +1,86 @@
+
 #include "ZigGlobalObject.h"
+
 #include "helpers.h"
 
+#include "JavaScriptCore/AggregateError.h"
+#include "JavaScriptCore/BytecodeIndex.h"
+#include "JavaScriptCore/CallFrameInlines.h"
+#include "JavaScriptCore/ClassInfo.h"
+#include "JavaScriptCore/CodeBlock.h"
+#include "JavaScriptCore/CodeCache.h"
+#include "JavaScriptCore/Completion.h"
+#include "JavaScriptCore/Error.h"
+#include "JavaScriptCore/ErrorInstance.h"
+#include "JavaScriptCore/Exception.h"
+#include "JavaScriptCore/ExceptionScope.h"
+#include "JavaScriptCore/FunctionConstructor.h"
+#include "JavaScriptCore/HashMapImpl.h"
+#include "JavaScriptCore/HashMapImplInlines.h"
+#include "JavaScriptCore/Heap.h"
+#include "JavaScriptCore/Identifier.h"
+#include "JavaScriptCore/InitializeThreading.h"
+#include "JavaScriptCore/IteratorOperations.h"
+#include "JavaScriptCore/JSArray.h"
+#include "JavaScriptCore/JSCInlines.h"
+#include "JavaScriptCore/JSCallbackConstructor.h"
+#include "JavaScriptCore/JSCallbackObject.h"
+#include "JavaScriptCore/JSCast.h"
+#include "JavaScriptCore/JSClassRef.h"
+#include "JavaScriptCore/JSMicrotask.h"
 #include "ZigConsoleClient.h"
-#include <JavaScriptCore/AggregateError.h>
-#include <JavaScriptCore/BytecodeIndex.h>
-#include <JavaScriptCore/CallFrameInlines.h>
-#include <JavaScriptCore/ClassInfo.h>
-#include <JavaScriptCore/CodeBlock.h>
-#include <JavaScriptCore/CodeCache.h>
-#include <JavaScriptCore/Completion.h>
-#include <JavaScriptCore/Error.h>
-#include <JavaScriptCore/ErrorInstance.h>
-#include <JavaScriptCore/Exception.h>
-#include <JavaScriptCore/ExceptionScope.h>
-#include <JavaScriptCore/FunctionConstructor.h>
-#include <JavaScriptCore/HashMapImpl.h>
-#include <JavaScriptCore/HashMapImplInlines.h>
-#include <JavaScriptCore/Heap.h>
-#include <JavaScriptCore/Identifier.h>
-#include <JavaScriptCore/InitializeThreading.h>
-#include <JavaScriptCore/IteratorOperations.h>
-#include <JavaScriptCore/JSArray.h>
-#include <JavaScriptCore/JSCInlines.h>
-#include <JavaScriptCore/JSCallbackConstructor.h>
-#include <JavaScriptCore/JSCallbackObject.h>
-#include <JavaScriptCore/JSCast.h>
-#include <JavaScriptCore/JSClassRef.h>
-#include <JavaScriptCore/JSMicrotask.h>
-// #include <JavaScriptCore/JSContextInternal.h>
-#include <JavaScriptCore/CatchScope.h>
-#include <JavaScriptCore/DeferredWorkTimer.h>
-#include <JavaScriptCore/JSInternalPromise.h>
-#include <JavaScriptCore/JSLock.h>
-#include <JavaScriptCore/JSMap.h>
-#include <JavaScriptCore/JSModuleLoader.h>
-#include <JavaScriptCore/JSModuleRecord.h>
-#include <JavaScriptCore/JSNativeStdFunction.h>
-#include <JavaScriptCore/JSObject.h>
-#include <JavaScriptCore/JSPromise.h>
-#include <JavaScriptCore/JSSet.h>
-#include <JavaScriptCore/JSSourceCode.h>
-#include <JavaScriptCore/JSString.h>
-#include <JavaScriptCore/JSValueInternal.h>
-#include <JavaScriptCore/JSVirtualMachineInternal.h>
-#include <JavaScriptCore/ObjectConstructor.h>
-#include <JavaScriptCore/OptionsList.h>
-#include <JavaScriptCore/ParserError.h>
-#include <JavaScriptCore/ScriptExecutable.h>
-#include <JavaScriptCore/SourceOrigin.h>
-#include <JavaScriptCore/StackFrame.h>
-#include <JavaScriptCore/StackVisitor.h>
-#include <JavaScriptCore/VM.h>
-#include <JavaScriptCore/VMEntryScope.h>
-#include <JavaScriptCore/WasmFaultSignalHandler.h>
+// #include "JavaScriptCore/JSContextInternal.h"
+#include "JavaScriptCore/CatchScope.h"
+#include "JavaScriptCore/DeferredWorkTimer.h"
+#include "JavaScriptCore/JSInternalPromise.h"
+#include "JavaScriptCore/JSLock.h"
+#include "JavaScriptCore/JSMap.h"
+#include "JavaScriptCore/JSModuleLoader.h"
+#include "JavaScriptCore/JSModuleRecord.h"
+#include "JavaScriptCore/JSNativeStdFunction.h"
+#include "JavaScriptCore/JSObject.h"
+#include "JavaScriptCore/JSPromise.h"
+#include "JavaScriptCore/JSSet.h"
+#include "JavaScriptCore/JSSourceCode.h"
+#include "JavaScriptCore/JSString.h"
+#include "JavaScriptCore/JSValueInternal.h"
+#include "JavaScriptCore/JSVirtualMachineInternal.h"
+#include "JavaScriptCore/ObjectConstructor.h"
+#include "JavaScriptCore/OptionsList.h"
+#include "JavaScriptCore/ParserError.h"
+#include "JavaScriptCore/ScriptExecutable.h"
+#include "JavaScriptCore/SourceOrigin.h"
+#include "JavaScriptCore/StackFrame.h"
+#include "JavaScriptCore/StackVisitor.h"
+#include "JavaScriptCore/VM.h"
+#include "JavaScriptCore/VMEntryScope.h"
+#include "JavaScriptCore/WasmFaultSignalHandler.h"
+#include "wtf/Gigacage.h"
+#include "wtf/StdLibExtras.h"
+#include "wtf/URL.h"
+#include "wtf/text/ExternalStringImpl.h"
+#include "wtf/text/StringCommon.h"
+#include "wtf/text/StringImpl.h"
+#include "wtf/text/StringView.h"
+#include "wtf/text/WTFString.h"
 #include <unistd.h>
-#include <wtf/Gigacage.h>
-#include <wtf/StdLibExtras.h>
-#include <wtf/URL.h>
-#include <wtf/text/ExternalStringImpl.h>
-#include <wtf/text/StringCommon.h>
-#include <wtf/text/StringImpl.h>
-#include <wtf/text/StringView.h>
-#include <wtf/text/WTFString.h>
 
+#include "wtf/text/Base64.h"
 #include <cstdlib>
 #include <exception>
 #include <iostream>
-#include <wtf/text/Base64.h>
-// #include <JavaScriptCore/CachedType.h>
-#include <JavaScriptCore/JSCallbackObject.h>
-#include <JavaScriptCore/JSClassRef.h>
+// #include "JavaScriptCore/CachedType.h"
+#include "JavaScriptCore/JSCallbackObject.h"
+#include "JavaScriptCore/JSClassRef.h"
 
 #include "BunClientData.h"
 
 #include "ZigSourceProvider.h"
 
 #include "JSDOMURL.h"
+#include "JSURLSearchParams.h"
+
+#include "Process.h"
 
 using JSGlobalObject = JSC::JSGlobalObject;
 using Exception = JSC::Exception;
@@ -125,18 +130,19 @@ extern "C" JSC__JSGlobalObject* Zig__GlobalObject__create(JSClassRef* globalObje
     auto heapSize = JSC::HeapType::Large;
 
     JSC::VM& vm = JSC::VM::create(heapSize).leakRef();
-    Bun::JSVMClientData::create(&vm);
+
+    WebCore::JSVMClientData::create(&vm);
 
     vm.heap.acquireAccess();
 
     JSC::Wasm::enableFastMemory();
 
     JSC::JSLockHolder locker(vm);
-    Zig::GlobalObject* globalObject = Zig::GlobalObject::create(vm, Zig::GlobalObject::createStructure(vm, JSC::jsNull()));
+    Zig::GlobalObject* globalObject = Zig::GlobalObject::create(vm, Zig::GlobalObject::createStructure(vm, JSC::JSGlobalObject::create(vm, JSC::JSGlobalObject::createStructure(vm, JSC::jsNull())), JSC::jsNull()));
     globalObject->setConsole(globalObject);
 
     if (count > 0) {
-        globalObject->installAPIGlobals(globalObjectClass, count);
+        globalObject->installAPIGlobals(globalObjectClass, count, vm);
     }
 
     JSC::gcProtect(globalObject);
@@ -206,7 +212,9 @@ extern "C" bool Zig__GlobalObject__resetModuleRegistryMap(JSC__JSGlobalObject* g
 
 namespace Zig {
 
-const JSC::ClassInfo GlobalObject::s_info = { "GlobalObject", &Base::s_info, nullptr, nullptr,
+using namespace WebCore;
+
+const JSC::ClassInfo GlobalObject::s_info = { "GlobalObject"_s, &Base::s_info, nullptr, nullptr,
     CREATE_METHOD_TABLE(GlobalObject) };
 
 extern "C" JSClassRef* Zig__getAPIGlobals(size_t* count);
@@ -215,14 +223,14 @@ extern "C" const JSC__JSValue* Zig__getAPIConstructors(size_t* count, JSC__JSGlo
 static JSGlobalObject* deriveShadowRealmGlobalObject(JSGlobalObject* globalObject)
 {
     auto& vm = globalObject->vm();
-    Zig::GlobalObject* shadow = Zig::GlobalObject::create(vm, Zig::GlobalObject::createStructure(vm, JSC::jsNull()));
+    Zig::GlobalObject* shadow = Zig::GlobalObject::create(vm, Zig::GlobalObject::createStructure(vm, JSC::JSGlobalObject::create(vm, JSC::JSGlobalObject::createStructure(vm, JSC::jsNull())), JSC::jsNull()));
     shadow->setConsole(shadow);
     size_t count = 0;
     JSClassRef* globalObjectClass = Zig__getAPIGlobals(&count);
 
     shadow->setConsole(shadow);
     if (count > 0) {
-        shadow->installAPIGlobals(globalObjectClass, count);
+        shadow->installAPIGlobals(globalObjectClass, count, vm);
     }
 
     return shadow;
@@ -269,7 +277,7 @@ const JSC::GlobalObjectMethodTable GlobalObject::s_globalObjectMethodTable = {
 };
 
 void GlobalObject::reportUncaughtExceptionAtEventLoop(JSGlobalObject* globalObject,
-    Exception* exception)
+    JSC::Exception* exception)
 {
     Zig__GlobalObject__reportUncaughtException(globalObject, exception);
 }
@@ -291,6 +299,28 @@ void GlobalObject::setConsole(void* console)
 
 #pragma mark - Globals
 
+JSC_DECLARE_CUSTOM_GETTER(JSDOMURL_getter);
+
+JSC_DEFINE_CUSTOM_GETTER(JSDOMURL_getter,
+    (JSC::JSGlobalObject * lexicalGlobalObject, JSC::EncodedJSValue thisValue,
+        JSC::PropertyName))
+{
+    Zig::GlobalObject* thisObject = JSC::jsCast<Zig::GlobalObject*>(lexicalGlobalObject);
+    return JSC::JSValue::encode(
+        WebCore::JSDOMURL::getConstructor(JSC::getVM(lexicalGlobalObject), thisObject));
+}
+
+JSC_DECLARE_CUSTOM_GETTER(JSURLSearchParams_getter);
+
+JSC_DEFINE_CUSTOM_GETTER(JSURLSearchParams_getter,
+    (JSC::JSGlobalObject * lexicalGlobalObject, JSC::EncodedJSValue thisValue,
+        JSC::PropertyName))
+{
+    Zig::GlobalObject* thisObject = JSC::jsCast<Zig::GlobalObject*>(lexicalGlobalObject);
+    return JSC::JSValue::encode(
+        WebCore::JSURLSearchParams::getConstructor(JSC::getVM(lexicalGlobalObject), thisObject));
+}
+
 static JSC_DECLARE_CUSTOM_SETTER(property_lazyProcessSetter);
 static JSC_DECLARE_CUSTOM_GETTER(property_lazyProcessGetter);
 
@@ -309,7 +339,7 @@ JSC_DEFINE_CUSTOM_GETTER(property_lazyProcessGetter,
     Zig::GlobalObject* globalObject = reinterpret_cast<Zig::GlobalObject*>(_globalObject);
 
     JSC::VM& vm = globalObject->vm();
-    auto clientData = Bun::clientData(vm);
+    auto clientData = WebCore::clientData(vm);
     JSC::JSValue processPrivate = globalObject->getIfPropertyExists(globalObject, clientData->builtinNames().processPrivateName());
     if (LIKELY(processPrivate)) {
         return JSC::JSValue::encode(processPrivate);
@@ -561,7 +591,7 @@ static JSC_DEFINE_HOST_FUNCTION(functionImportMeta__resolve,
                 return JSC::JSValue::encode(JSC::JSValue {});
             }
 
-            auto clientData = Bun::clientData(vm);
+            auto clientData = WebCore::clientData(vm);
 
             from = JSC::JSValue::encode(thisObject->get(globalObject, clientData->builtinNames().urlPublicName()));
         }
@@ -592,19 +622,19 @@ static JSC_DEFINE_HOST_FUNCTION(functionReportError,
 // This is not a publicly exposed API currently.
 // This is used by the bundler to make Response, Request, FetchEvent,
 // and any other objects available globally.
-void GlobalObject::installAPIGlobals(JSClassRef* globals, int count)
+void GlobalObject::installAPIGlobals(JSClassRef* globals, int count, JSC::VM& vm)
 {
-    auto clientData = Bun::clientData(vm());
+    auto clientData = WebCore::clientData(vm);
     size_t constructor_count = 0;
     JSC__JSValue const* constructors = Zig__getAPIConstructors(&constructor_count, this);
     WTF::Vector<GlobalPropertyInfo> extraStaticGlobals;
     extraStaticGlobals.reserveCapacity((size_t)count + constructor_count + 3 + 10);
     int i = 0;
     for (; i < constructor_count; i++) {
-        auto* object = JSC::jsDynamicCast<JSC::JSCallbackConstructor*>(vm(), JSC::JSValue::decode(constructors[i]).asCell()->getObject());
+        auto* object = JSC::jsDynamicCast<JSC::JSCallbackConstructor*>(vm, JSC::JSValue::decode(constructors[i]).asCell()->getObject());
 
         extraStaticGlobals.uncheckedAppend(
-            GlobalPropertyInfo { JSC::Identifier::fromString(vm(), object->get(this, vm().propertyNames->name).toWTFString(this)),
+            GlobalPropertyInfo { JSC::Identifier::fromString(vm, object->get(this, vm.propertyNames->name).toWTFString(this)),
                 JSC::JSValue(object), JSC::PropertyAttribute::DontDelete | 0 });
     }
     int j = 0;
@@ -614,10 +644,10 @@ void GlobalObject::installAPIGlobals(JSClassRef* globals, int count)
         JSC::JSCallbackObject<JSNonFinalObject>* object = JSC::JSCallbackObject<JSNonFinalObject>::create(this, this->callbackObjectStructure(),
             jsClass, nullptr);
         if (JSObject* prototype = object->classRef()->prototype(this))
-            object->setPrototypeDirect(vm(), prototype);
+            object->setPrototypeDirect(vm, prototype);
 
         extraStaticGlobals.uncheckedAppend(
-            GlobalPropertyInfo { JSC::Identifier::fromString(vm(), jsClass->className()),
+            GlobalPropertyInfo { JSC::Identifier::fromString(vm, jsClass->className()),
                 JSC::JSValue(object), JSC::PropertyAttribute::DontDelete | 0 });
     }
 
@@ -633,85 +663,143 @@ void GlobalObject::installAPIGlobals(JSClassRef* globals, int count)
     //   JSC::JSCallbackObject<JSNonFinalObject> *object =
     //     JSC::JSCallbackObject<JSNonFinalObject>::create(this, this->callbackObjectStructure(),
     //                                                     jsClass, nullptr);
-    //   if (JSObject *prototype = jsClass->prototype(this)) object->setPrototypeDirect(vm(),
+    //   if (JSObject *prototype = jsClass->prototype(this)) object->setPrototypeDirect(vm,
     //   prototype);
 
-    //   process->putDirect(this->vm(), JSC::Identifier::fromString(this->vm(), "env"),
+    //   process->putDirect(this->vm, JSC::Identifier::fromString(this->vm, "env"),
     //                      JSC::JSValue(object), JSC::PropertyAttribute::DontDelete | 0);
     // }
 
-    JSC::Identifier queueMicrotaskIdentifier = JSC::Identifier::fromString(vm(), "queueMicrotask"_s);
+    JSC::Identifier queueMicrotaskIdentifier = JSC::Identifier::fromString(vm, "queueMicrotask"_s);
     extraStaticGlobals.uncheckedAppend(
         GlobalPropertyInfo { queueMicrotaskIdentifier,
-            JSC::JSFunction::create(vm(), JSC::jsCast<JSC::JSGlobalObject*>(this), 0,
+            JSC::JSFunction::create(vm, JSC::jsCast<JSC::JSGlobalObject*>(globalObject()), 0,
                 "queueMicrotask", functionQueueMicrotask),
             JSC::PropertyAttribute::DontDelete | 0 });
 
-    JSC::Identifier setTimeoutIdentifier = JSC::Identifier::fromString(vm(), "setTimeout"_s);
+    JSC::Identifier setTimeoutIdentifier = JSC::Identifier::fromString(vm, "setTimeout"_s);
     extraStaticGlobals.uncheckedAppend(
         GlobalPropertyInfo { setTimeoutIdentifier,
-            JSC::JSFunction::create(vm(), JSC::jsCast<JSC::JSGlobalObject*>(this), 0,
+            JSC::JSFunction::create(vm, JSC::jsCast<JSC::JSGlobalObject*>(globalObject()), 0,
                 "setTimeout", functionSetTimeout),
             JSC::PropertyAttribute::DontDelete | 0 });
 
-    JSC::Identifier clearTimeoutIdentifier = JSC::Identifier::fromString(vm(), "clearTimeout"_s);
+    JSC::Identifier clearTimeoutIdentifier = JSC::Identifier::fromString(vm, "clearTimeout"_s);
     extraStaticGlobals.uncheckedAppend(
         GlobalPropertyInfo { clearTimeoutIdentifier,
-            JSC::JSFunction::create(vm(), JSC::jsCast<JSC::JSGlobalObject*>(this), 0,
+            JSC::JSFunction::create(vm, JSC::jsCast<JSC::JSGlobalObject*>(globalObject()), 0,
                 "clearTimeout", functionClearTimeout),
             JSC::PropertyAttribute::DontDelete | 0 });
 
-    JSC::Identifier setIntervalIdentifier = JSC::Identifier::fromString(vm(), "setInterval"_s);
+    JSC::Identifier setIntervalIdentifier = JSC::Identifier::fromString(vm, "setInterval"_s);
     extraStaticGlobals.uncheckedAppend(
         GlobalPropertyInfo { setIntervalIdentifier,
-            JSC::JSFunction::create(vm(), JSC::jsCast<JSC::JSGlobalObject*>(this), 0,
+            JSC::JSFunction::create(vm, JSC::jsCast<JSC::JSGlobalObject*>(globalObject()), 0,
                 "setInterval", functionSetInterval),
             JSC::PropertyAttribute::DontDelete | 0 });
 
-    JSC::Identifier clearIntervalIdentifier = JSC::Identifier::fromString(vm(), "clearInterval"_s);
+    JSC::Identifier clearIntervalIdentifier = JSC::Identifier::fromString(vm, "clearInterval"_s);
     extraStaticGlobals.uncheckedAppend(
         GlobalPropertyInfo { clearIntervalIdentifier,
-            JSC::JSFunction::create(vm(), JSC::jsCast<JSC::JSGlobalObject*>(this), 0,
+            JSC::JSFunction::create(vm, JSC::jsCast<JSC::JSGlobalObject*>(globalObject()), 0,
                 "clearInterval", functionClearInterval),
             JSC::PropertyAttribute::DontDelete | 0 });
 
-    JSC::Identifier atobIdentifier = JSC::Identifier::fromString(vm(), "atob"_s);
+    JSC::Identifier atobIdentifier = JSC::Identifier::fromString(vm, "atob"_s);
     extraStaticGlobals.uncheckedAppend(
         GlobalPropertyInfo { atobIdentifier,
-            JSC::JSFunction::create(vm(), JSC::jsCast<JSC::JSGlobalObject*>(this), 0,
+            JSC::JSFunction::create(vm, JSC::jsCast<JSC::JSGlobalObject*>(globalObject()), 0,
                 "atob", functionATOB),
             JSC::PropertyAttribute::DontDelete | 0 });
 
-    JSC::Identifier btoaIdentifier = JSC::Identifier::fromString(vm(), "btoa"_s);
+    JSC::Identifier btoaIdentifier = JSC::Identifier::fromString(vm, "btoa"_s);
     extraStaticGlobals.uncheckedAppend(
         GlobalPropertyInfo { btoaIdentifier,
-            JSC::JSFunction::create(vm(), JSC::jsCast<JSC::JSGlobalObject*>(this), 0,
+            JSC::JSFunction::create(vm, JSC::jsCast<JSC::JSGlobalObject*>(globalObject()), 0,
                 "btoa", functionBTOA),
             JSC::PropertyAttribute::DontDelete | 0 });
-    JSC::Identifier reportErrorIdentifier = JSC::Identifier::fromString(vm(), "reportError"_s);
+    JSC::Identifier reportErrorIdentifier = JSC::Identifier::fromString(vm, "reportError"_s);
+    extraStaticGlobals.uncheckedAppend(
+        GlobalPropertyInfo { reportErrorIdentifier,
+            JSC::JSFunction::create(vm, JSC::jsCast<JSC::JSGlobalObject*>(globalObject()), 0,
+                "reportError", functionReportError),
+            JSC::PropertyAttribute::DontDelete | 0 });
+
+    JSC::Identifier URLConstructor = JSC::Identifier::fromString(vm, "URL"_s);
     extraStaticGlobals.uncheckedAppend(
         GlobalPropertyInfo { reportErrorIdentifier,
-            JSC::JSFunction::create(vm(), JSC::jsCast<JSC::JSGlobalObject*>(this), 0,
+            JSC::JSFunction::create(vm, JSC::jsCast<JSC::JSGlobalObject*>(globalObject()), 0,
                 "reportError", functionReportError),
             JSC::PropertyAttribute::DontDelete | 0 });
 
     this->addStaticGlobals(extraStaticGlobals.data(), extraStaticGlobals.size());
-    putDirectCustomAccessor(
-        vm(), clientData->builtinNames().processPublicName(),
-        JSC::CustomGetterSetter::create(vm(), property_lazyProcessGetter, property_lazyProcessSetter),
-        PropertyAttribute::DontDelete | JSC::PropertyAttribute::CustomAccessor | 0);
 
-    auto domURL = WebCore::DOMURL::create("https://example.com/"_s, WTF::String());
-    auto url = WebCore::JSDOMURL::create(
-        WebCore::JSDOMURL::createStructure(vm(), this, objectPrototype()),
-        this,
-        domURL.returnValue().get());
+    putDirectCustomAccessor(vm, JSC::Identifier::fromString(vm, "URL"), JSC::CustomGetterSetter::create(vm, JSDOMURL_getter, nullptr),
+        JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly);
 
-    this->putDirect(vm(), clientData->builtinNames().urlPublicName(), JSC::JSValue(url), JSC::PropertyAttribute::DontDelete | 0);
+    putDirectCustomAccessor(vm, JSC::Identifier::fromString(vm, "URLSearchParams"), JSC::CustomGetterSetter::create(vm, JSURLSearchParams_getter, nullptr),
+        JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly);
 
     extraStaticGlobals.releaseBuffer();
 }
 
+template<typename Visitor>
+void GlobalObject::visitChildrenImpl(JSCell* cell, Visitor& visitor)
+{
+    GlobalObject* thisObject = jsCast<GlobalObject*>(cell);
+    ASSERT_GC_OBJECT_INHERITS(thisObject, info());
+    Base::visitChildren(thisObject, visitor);
+
+    {
+        // The GC thread has to grab the GC lock even though it is not mutating the containers.
+        Locker locker { thisObject->m_gcLock };
+
+        for (auto& structure : thisObject->m_structures.values())
+            visitor.append(structure);
+
+        // for (auto& guarded : thisObject->m_guardedObjects)
+        //     guarded->visitAggregate(visitor);
+    }
+
+    for (auto& constructor : thisObject->constructors().array())
+        visitor.append(constructor);
+
+    // thisObject->m_builtinInternalFunctions.visit(visitor);
+}
+
+DEFINE_VISIT_CHILDREN(GlobalObject);
+
+// void GlobalObject::destroy(JSCell* cell)
+// {
+//     static_cast<Zig::GlobalObject*>(cell)->Zig::GlobalObject::~Zig::GlobalObject();
+// }
+
+// template<typename Visitor>
+// void GlobalObject::visitChildrenImpl(JSCell* cell, Visitor& visitor)
+// {
+//     Zig::GlobalObject* thisObject = jsCast<Zig::GlobalObject*>(cell);
+//     ASSERT_GC_OBJECT_INHERITS(thisObject, info());
+//     Base::visitChildren(thisObject, visitor);
+
+//     {
+//         // The GC thread has to grab the GC lock even though it is not mutating the containers.
+//         Locker locker { thisObject->m_gcLock };
+
+//         for (auto& structure : thisObject->m_structures.values())
+//             visitor.append(structure);
+
+//         for (auto& guarded : thisObject->m_guardedObjects)
+//             guarded->visitAggregate(visitor);
+//     }
+
+//     for (auto& constructor : thisObject->constructors().array())
+//         visitor.append(constructor);
+
+//     thisObject->m_builtinInternalFunctions.visit(visitor);
+// }
+
+// DEFINE_VISIT_CHILDREN(Zig::GlobalObject);
+
 JSC::Identifier GlobalObject::moduleLoaderResolve(JSGlobalObject* globalObject,
     JSModuleLoader* loader, JSValue key,
     JSValue referrer, JSValue origin)
@@ -835,7 +923,7 @@ JSC::JSObject* GlobalObject::moduleLoaderCreateImportMetaProperties(JSGlobalObje
     JSC::JSObject* metaProperties = JSC::constructEmptyObject(vm, globalObject->nullPrototypeObjectStructure());
     RETURN_IF_EXCEPTION(scope, nullptr);
 
-    auto clientData = Bun::clientData(vm);
+    auto clientData = WebCore::clientData(vm);
     JSString* keyString = key.toStringOrNull(globalObject);
     if (UNLIKELY(!keyString)) {
         return metaProperties;
diff --git a/src/javascript/jsc/bindings/ZigGlobalObject.h b/src/javascript/jsc/bindings/ZigGlobalObject.h
index e5f65578f..8ac226220 100644
--- a/src/javascript/jsc/bindings/ZigGlobalObject.h
+++ b/src/javascript/jsc/bindings/ZigGlobalObject.h
@@ -1,52 +1,99 @@
-#include "root.h"
 #pragma once
 
-#include "headers-handwritten.h"
-
 namespace JSC {
 class Structure;
 class Identifier;
 
 } // namespace JSC
 
-#include "Process.h"
+#include "root.h"
+
+#include "headers-handwritten.h"
+#include "BunClientData.h"
+
+#include "JavaScriptCore/CatchScope.h"
+#include "JavaScriptCore/JSGlobalObject.h"
+#include "JavaScriptCore/JSTypeInfo.h"
+#include "JavaScriptCore/Structure.h"
+
 #include "ZigConsoleClient.h"
-#include <JavaScriptCore/CatchScope.h>
-#include <JavaScriptCore/JSGlobalObject.h>
-#include <JavaScriptCore/JSTypeInfo.h>
-#include <JavaScriptCore/Structure.h>
+
+#include "DOMConstructors.h"
+#include "DOMWrapperWorld-class.h"
+#include "DOMIsoSubspaces.h"
 
 namespace Zig {
 
+using JSDOMStructureMap = HashMap<const JSC::ClassInfo*, JSC::WriteBarrier<JSC::Structure>>;
+
 class GlobalObject : public JSC::JSGlobalObject {
     using Base = JSC::JSGlobalObject;
 
 public:
-    DECLARE_EXPORT_INFO;
+    static const JSC::ClassInfo s_info;
     static const JSC::GlobalObjectMethodTable s_globalObjectMethodTable;
-    Zig::Process* m_process;
-    static constexpr bool needsDestruction = true;
-    template<typename CellType, JSC::SubspaceAccess mode>
-    static GCClient::IsoSubspace* subspaceFor(VM& vm)
+    static constexpr bool needsDestruction = false;
+
+    template<typename, SubspaceAccess mode> static JSC::GCClient::IsoSubspace* subspaceFor(JSC::VM& vm)
+    {
+        if constexpr (mode == JSC::SubspaceAccess::Concurrently)
+            return nullptr;
+        return WebCore::subspaceForImpl<GlobalObject, WebCore::UseCustomHeapCellType::No>(
+            vm,
+            [](auto& spaces) { return spaces.m_clientSubspaceForGlobalObject.get(); },
+            [](auto& spaces, auto&& space) { spaces.m_clientSubspaceForGlobalObject = WTFMove(space); },
+            [](auto& spaces) { return spaces.m_subspaceForGlobalObject.get(); },
+            [](auto& spaces, auto&& space) { spaces.m_subspaceForGlobalObject = WTFMove(space); });
+    }
+
+    ~GlobalObject();
+
+    static constexpr const JSC::ClassInfo* info() { return &s_info; }
+
+    static JSC::Structure* createStructure(JSC::VM& vm, JSC::JSGlobalObject* global, JSC::JSValue prototype)
     {
-        return vm.globalObjectSpace<mode>();
+        return JSC::Structure::create(vm, global, prototype, JSC::TypeInfo(JSC::GlobalObjectType, StructureFlags), info());
     }
 
+    // Make binding code generation easier.
+    GlobalObject* globalObject() { return this; }
+
     static GlobalObject* create(JSC::VM& vm, JSC::Structure* structure)
     {
-        auto* object = new (NotNull, JSC::allocateCell<GlobalObject>(vm)) GlobalObject(vm, structure);
-        object->finishCreation(vm);
-        return object;
+        GlobalObject* ptr = new (NotNull, JSC::allocateCell<GlobalObject>(vm)) GlobalObject(vm, structure);
+        ptr->finishCreation(vm);
+        return ptr;
+    }
+
+    const JSDOMStructureMap& structures() const WTF_IGNORES_THREAD_SAFETY_ANALYSIS
+    {
+        ASSERT(!Thread::mayBeGCThread());
+        return m_structures;
     }
+    const WebCore::DOMConstructors& constructors() const
+    {
+        ASSERT(!Thread::mayBeGCThread());
+        return *m_constructors;
+    }
+
+    WebCore::DOMWrapperWorld& world() { return m_world.get(); }
+
+    DECLARE_VISIT_CHILDREN;
 
-    static JSC::Structure* createStructure(JSC::VM& vm, JSC::JSValue prototype)
+    bool worldIsNormal() const { return m_worldIsNormal; }
+    static ptrdiff_t offsetOfWorldIsNormal() { return OBJECT_OFFSETOF(GlobalObject, m_worldIsNormal); }
+
+    JSDOMStructureMap& structures() WTF_REQUIRES_LOCK(m_gcLock) { return m_structures; }
+    JSDOMStructureMap& structures(NoLockingNecessaryTag) WTF_IGNORES_THREAD_SAFETY_ANALYSIS
     {
-        auto* result = JSC::Structure::create(
-            vm, nullptr, prototype, JSC::TypeInfo(JSC::GlobalObjectType, Base::StructureFlags), info());
-        result->setTransitionWatchpointIsLikelyToBeFired(true);
-        return result;
+        ASSERT(!vm().heap.mutatorShouldBeFenced());
+        return m_structures;
     }
 
+    WebCore::DOMConstructors& constructors() { return *m_constructors; }
+
+    Lock& gcLock() WTF_RETURNS_LOCK(m_gcLock) { return m_gcLock; }
+
     static void reportUncaughtExceptionAtEventLoop(JSGlobalObject*, JSC::Exception*);
     static JSGlobalObject* deriveShadowRealmGlobalObject(JSGlobalObject* globalObject);
     static void queueMicrotaskToEventLoop(JSC::JSGlobalObject& global, Ref<JSC::Microtask>&& task);
@@ -67,13 +114,24 @@ public:
     static void promiseRejectionTracker(JSGlobalObject*, JSC::JSPromise*,
         JSC::JSPromiseRejectionOperation);
     void setConsole(void* console);
-    void installAPIGlobals(JSClassRef* globals, int count);
+    void installAPIGlobals(JSClassRef* globals, int count, JSC::VM& vm);
 
 private:
     GlobalObject(JSC::VM& vm, JSC::Structure* structure)
         : JSC::JSGlobalObject(vm, structure, &s_globalObjectMethodTable)
+        , m_constructors(makeUnique<WebCore::DOMConstructors>())
+        , m_world(WebCore::DOMWrapperWorld::create(vm, WebCore::DOMWrapperWorld::Type::Normal))
+        , m_worldIsNormal(true)
     {
     }
+
+private:
+    std::unique_ptr<WebCore::DOMConstructors> m_constructors;
+    uint8_t m_worldIsNormal;
+    JSDOMStructureMap m_structures WTF_GUARDED_BY_LOCK(m_gcLock);
+    Lock m_gcLock;
+
+    Ref<WebCore::DOMWrapperWorld> m_world;
 };
 
 class JSMicrotaskCallback : public RefCounted<JSMicrotaskCallback> {
@@ -105,3 +163,11 @@ private:
 };
 
 } // namespace Zig
+
+namespace WebCore {
+using JSDOMGlobalObject = Zig::GlobalObject;
+}
+
+namespace WebCore {
+using JSDOMGlobalObject = Zig::GlobalObject;
+}
diff --git a/src/javascript/jsc/bindings/ZigSourceProvider.cpp b/src/javascript/jsc/bindings/ZigSourceProvider.cpp
index 2112a15df..4e426b449 100644
--- a/src/javascript/jsc/bindings/ZigSourceProvider.cpp
+++ b/src/javascript/jsc/bindings/ZigSourceProvider.cpp
@@ -1,13 +1,16 @@
-#include "ZigSourceProvider.h"
-#include "helpers.h"
 #include "root.h"
-#include <JavaScriptCore/BytecodeCacheError.h>
-#include <JavaScriptCore/CodeCache.h>
 
-#include <JavaScriptCore/Completion.h>
+#include "helpers.h"
+
+#include "ZigSourceProvider.h"
+
+#include "JavaScriptCore/BytecodeCacheError.h"
+#include "JavaScriptCore/CodeCache.h"
+
+#include "JavaScriptCore/Completion.h"
+#include "wtf/Scope.h"
+#include "wtf/text/StringHash.h"
 #include <sys/stat.h>
-#include <wtf/Scope.h>
-#include <wtf/text/StringHash.h>
 
 extern "C" void RefString__free(void*, void*, unsigned);
 
diff --git a/src/javascript/jsc/bindings/ZigSourceProvider.h b/src/javascript/jsc/bindings/ZigSourceProvider.h
index cf668e3e0..cd45a0217 100644
--- a/src/javascript/jsc/bindings/ZigSourceProvider.h
+++ b/src/javascript/jsc/bindings/ZigSourceProvider.h
@@ -10,13 +10,13 @@ class SourceCodeKey;
 class SourceProvider;
 } // namespace JSC
 
+#include "JavaScriptCore/CachedBytecode.h"
+#include "JavaScriptCore/JSGlobalObject.h"
+#include "JavaScriptCore/JSTypeInfo.h"
 #include "ZigConsoleClient.h"
-#include <JavaScriptCore/CachedBytecode.h>
-#include <JavaScriptCore/JSGlobalObject.h>
-#include <JavaScriptCore/JSTypeInfo.h>
-// #include <JavaScriptCore/SourceCodeKey.h>
-#include <JavaScriptCore/SourceProvider.h>
-#include <JavaScriptCore/Structure.h>
+// #include "JavaScriptCore/SourceCodeKey.h"
+#include "JavaScriptCore/SourceProvider.h"
+#include "JavaScriptCore/Structure.h"
 
 namespace Zig {
 
diff --git a/src/javascript/jsc/bindings/bindings.cpp b/src/javascript/jsc/bindings/bindings.cpp
index 3a155f5dd..24a8c9625 100644
--- a/src/javascript/jsc/bindings/bindings.cpp
+++ b/src/javascript/jsc/bindings/bindings.cpp
@@ -1,49 +1,53 @@
+#include "root.h"
+
 #include "BunClientData.h"
 #include "GCDefferalContext.h"
+
+#include "JavaScriptCore/AggregateError.h"
+#include "JavaScriptCore/BytecodeIndex.h"
+#include "JavaScriptCore/CodeBlock.h"
+#include "JavaScriptCore/Completion.h"
+#include "JavaScriptCore/DeferredWorkTimer.h"
+#include "JavaScriptCore/ErrorInstance.h"
+#include "JavaScriptCore/ExceptionHelpers.h"
+#include "JavaScriptCore/ExceptionScope.h"
+#include "JavaScriptCore/FunctionConstructor.h"
+#include "JavaScriptCore/HeapSnapshotBuilder.h"
+#include "JavaScriptCore/Identifier.h"
+#include "JavaScriptCore/IteratorOperations.h"
+#include "JavaScriptCore/JSArray.h"
+#include "JavaScriptCore/JSArrayBuffer.h"
+#include "JavaScriptCore/JSArrayInlines.h"
+#include "JavaScriptCore/JSCInlines.h"
+#include "JavaScriptCore/JSCallbackObject.h"
+#include "JavaScriptCore/JSClassRef.h"
+#include "JavaScriptCore/JSInternalPromise.h"
+#include "JavaScriptCore/JSMap.h"
+#include "JavaScriptCore/JSModuleLoader.h"
+#include "JavaScriptCore/JSModuleRecord.h"
+#include "JavaScriptCore/JSNativeStdFunction.h"
+#include "JavaScriptCore/JSONObject.h"
+#include "JavaScriptCore/JSObject.h"
+#include "JavaScriptCore/JSSet.h"
+#include "JavaScriptCore/JSString.h"
+#include "JavaScriptCore/Microtask.h"
+#include "JavaScriptCore/ObjectConstructor.h"
+#include "JavaScriptCore/ParserError.h"
+#include "JavaScriptCore/ScriptExecutable.h"
+#include "JavaScriptCore/StackFrame.h"
+#include "JavaScriptCore/StackVisitor.h"
+#include "JavaScriptCore/VM.h"
+#include "JavaScriptCore/WasmFaultSignalHandler.h"
+#include "JavaScriptCore/Watchdog.h"
 #include "ZigGlobalObject.h"
 #include "helpers.h"
-#include "root.h"
-#include <JavaScriptCore/AggregateError.h>
-#include <JavaScriptCore/BytecodeIndex.h>
-#include <JavaScriptCore/CodeBlock.h>
-#include <JavaScriptCore/Completion.h>
-#include <JavaScriptCore/DeferredWorkTimer.h>
-#include <JavaScriptCore/ErrorInstance.h>
-#include <JavaScriptCore/ExceptionHelpers.h>
-#include <JavaScriptCore/ExceptionScope.h>
-#include <JavaScriptCore/FunctionConstructor.h>
-#include <JavaScriptCore/HeapSnapshotBuilder.h>
-#include <JavaScriptCore/Identifier.h>
-#include <JavaScriptCore/IteratorOperations.h>
-#include <JavaScriptCore/JSArray.h>
-#include <JavaScriptCore/JSArrayBuffer.h>
-#include <JavaScriptCore/JSArrayInlines.h>
-#include <JavaScriptCore/JSCInlines.h>
-#include <JavaScriptCore/JSCallbackObject.h>
-#include <JavaScriptCore/JSClassRef.h>
-#include <JavaScriptCore/JSInternalPromise.h>
-#include <JavaScriptCore/JSMap.h>
-#include <JavaScriptCore/JSModuleLoader.h>
-#include <JavaScriptCore/JSModuleRecord.h>
-#include <JavaScriptCore/JSNativeStdFunction.h>
-#include <JavaScriptCore/JSONObject.h>
-#include <JavaScriptCore/JSObject.h>
-#include <JavaScriptCore/JSSet.h>
-#include <JavaScriptCore/JSString.h>
-#include <JavaScriptCore/Microtask.h>
-#include <JavaScriptCore/ObjectConstructor.h>
-#include <JavaScriptCore/ParserError.h>
-#include <JavaScriptCore/ScriptExecutable.h>
-#include <JavaScriptCore/StackFrame.h>
-#include <JavaScriptCore/StackVisitor.h>
-#include <JavaScriptCore/VM.h>
-#include <JavaScriptCore/WasmFaultSignalHandler.h>
-#include <JavaScriptCore/Watchdog.h>
-#include <wtf/text/ExternalStringImpl.h>
-#include <wtf/text/StringCommon.h>
-#include <wtf/text/StringImpl.h>
-#include <wtf/text/StringView.h>
-#include <wtf/text/WTFString.h>
+
+#include "wtf/text/ExternalStringImpl.h"
+#include "wtf/text/StringCommon.h"
+#include "wtf/text/StringImpl.h"
+#include "wtf/text/StringView.h"
+#include "wtf/text/WTFString.h"
+
 extern "C" {
 
 JSC__JSValue SystemError__toErrorInstance(const SystemError* arg0,
@@ -66,7 +70,7 @@ JSC__JSValue SystemError__toErrorInstance(const SystemError* arg0,
     JSC::Structure* errorStructure = globalObject->errorStructure();
     JSC::JSObject* result = JSC::ErrorInstance::create(globalObject, errorStructure, message, options);
 
-    auto clientData = Bun::clientData(vm);
+    auto clientData = WebCore::clientData(vm);
 
     if (err.code.len > 0) {
         JSC::JSValue code = Zig::toJSString(err.code, globalObject);
@@ -642,7 +646,7 @@ JSC__JSValue JSC__JSValue__createRangeError(const ZigString* message, const ZigS
         0);
 
     if (code.len > 0) {
-        auto clientData = Bun::clientData(vm);
+        auto clientData = WebCore::clientData(vm);
         JSC::JSValue codeValue = Zig::toJSStringValue(code, globalObject);
         rangeError->putDirect(vm, clientData->builtinNames().codePublicName(), codeValue,
             JSC::PropertyAttribute::ReadOnly | 0);
@@ -665,7 +669,7 @@ JSC__JSValue JSC__JSValue__createTypeError(const ZigString* message, const ZigSt
         0);
 
     if (code.len > 0) {
-        auto clientData = Bun::clientData(vm);
+        auto clientData = WebCore::clientData(vm);
         JSC::JSValue codeValue = Zig::toJSStringValue(code, globalObject);
         typeError->putDirect(vm, clientData->builtinNames().codePublicName(), codeValue, 0);
     }
@@ -1184,77 +1188,77 @@ void JSC__SourceCode__fromString(JSC__SourceCode* arg0, const WTF__String* arg1,
 
 #pragma mark - JSC::JSFunction
 
-JSC__JSValue JSC__JSFunction__callWithArguments(JSC__JSValue JSValue0, JSC__JSGlobalObject* arg1,
-    JSC__JSValue* arg2, size_t arg3,
-    JSC__Exception** arg4, const unsigned char* arg5)
-{
-    auto args = makeArgs(arg2, arg3);
-    return JSC::JSValue::encode(JSC::call(arg1, JSC::JSValue::decode(JSValue0),
-        JSC::JSValue::decode(JSValue0), args, (const char*)arg5));
-}
-JSC__JSValue JSC__JSFunction__callWithArgumentsAndThis(JSC__JSValue JSValue0, JSC__JSValue JSValue1,
-    JSC__JSGlobalObject* arg2,
-    JSC__JSValue* arg3, size_t arg4,
-    JSC__Exception** arg5,
-    const unsigned char* arg6)
-{
-    auto args = makeArgs(arg3, arg4);
-    return JSC::JSValue::encode(JSC::call(arg2, JSC::JSValue::decode(JSValue0),
-        JSC::JSValue::decode(JSValue1), args, (const char*)arg6));
-}
-JSC__JSValue JSC__JSFunction__callWithoutAnyArgumentsOrThis(JSC__JSValue JSValue0,
-    JSC__JSGlobalObject* arg1,
-    JSC__Exception** arg2,
-    const unsigned char* arg3)
-{
-    return JSC::JSValue::encode(JSC::call(arg1, JSC::JSValue::decode(JSValue0),
-        JSC::JSValue::decode(JSValue0), JSC::ArgList(),
-        (const char*)arg3));
-}
-JSC__JSValue JSC__JSFunction__callWithThis(JSC__JSValue JSValue0, JSC__JSGlobalObject* arg1,
-    JSC__JSValue JSValue2, JSC__Exception** arg3,
-    const unsigned char* arg4)
-{
-    return JSC::JSValue::encode(JSC::call(arg1, JSC::JSValue::decode(JSValue0),
-        JSC::JSValue::decode(JSValue2), JSC::ArgList(),
-        (const char*)arg4));
-}
-JSC__JSValue JSC__JSFunction__constructWithArguments(JSC__JSValue JSValue0,
-    JSC__JSGlobalObject* arg1, JSC__JSValue* arg2,
-    size_t arg3, JSC__Exception** arg4,
-    const unsigned char* arg5)
-{
-    auto args = makeArgs(arg2, arg3);
-    return JSC::JSValue::encode(
-        JSC::construct(arg1, JSC::JSValue::decode(JSValue0), args, (const char*)arg5));
-}
+// JSC__JSValue JSC__JSFunction__callWithArguments(JSC__JSValue JSValue0, JSC__JSGlobalObject* arg1,
+//     JSC__JSValue* arg2, size_t arg3,
+//     JSC__Exception** arg4, const unsigned char* arg5)
+// {
+//     auto args = makeArgs(arg2, arg3);
+//     return JSC::JSValue::encode(JSC::call(arg1, JSC::JSValue::decode(JSValue0),
+//         JSC::JSValue::decode(JSValue0), args, (const char*)arg5));
+// }
+// JSC__JSValue JSC__JSFunction__callWithArgumentsAndThis(JSC__JSValue JSValue0, JSC__JSValue JSValue1,
+//     JSC__JSGlobalObject* arg2,
+//     JSC__JSValue* arg3, size_t arg4,
+//     JSC__Exception** arg5,
+//     const unsigned char* arg6)
+// {
+//     auto args = makeArgs(arg3, arg4);
+//     return JSC::JSValue::encode(JSC::call(arg2, JSC::JSValue::decode(JSValue0),
+//         JSC::JSValue::decode(JSValue1), args, (const char*)arg6));
+// }
+// JSC__JSValue JSC__JSFunction__callWithoutAnyArgumentsOrThis(JSC__JSValue JSValue0,
+//     JSC__JSGlobalObject* arg1,
+//     JSC__Exception** arg2,
+//     const unsigned char* arg3)
+// {
+//     return JSC::JSValue::encode(JSC::call(arg1, JSC::JSValue::decode(JSValue0),
+//         JSC::JSValue::decode(JSValue0), JSC::ArgList(),
+//         (const char*)arg3));
+// }
+// JSC__JSValue JSC__JSFunction__callWithThis(JSC__JSValue JSValue0, JSC__JSGlobalObject* arg1,
+//     JSC__JSValue JSValue2, JSC__Exception** arg3,
+//     const unsigned char* arg4)
+// {
+//     return JSC::JSValue::encode(JSC::call(arg1, JSC::JSValue::decode(JSValue0),
+//         JSC::JSValue::decode(JSValue2), JSC::ArgList(),
+//         (const char*)arg4));
+// }
+// JSC__JSValue JSC__JSFunction__constructWithArguments(JSC__JSValue JSValue0,
+//     JSC__JSGlobalObject* arg1, JSC__JSValue* arg2,
+//     size_t arg3, JSC__Exception** arg4,
+//     const unsigned char* arg5)
+// {
+//     auto args = makeArgs(arg2, arg3);
+//     return JSC::JSValue::encode(
+//         JSC::construct(arg1, JSC::JSValue::decode(JSValue0), args, (const char*)arg5));
+// }
 
-JSC__JSValue JSC__JSFunction__constructWithArgumentsAndNewTarget(
-    JSC__JSValue JSValue0, JSC__JSValue JSValue1, JSC__JSGlobalObject* arg2, JSC__JSValue* arg3,
-    size_t arg4, JSC__Exception** arg5, const unsigned char* arg6)
-{
-    auto args = makeArgs(arg3, arg4);
-    return JSC::JSValue::encode(JSC::construct(arg2, JSC::JSValue::decode(JSValue0),
-        JSC::JSValue::decode(JSValue0), args,
-        (const char*)arg6));
-}
-JSC__JSValue JSC__JSFunction__constructWithNewTarget(JSC__JSValue JSValue0,
-    JSC__JSGlobalObject* arg1,
-    JSC__JSValue JSValue2, JSC__Exception** arg3,
-    const unsigned char* arg4)
-{
-    return JSC::JSValue::encode(JSC::construct(arg1, JSC::JSValue::decode(JSValue0),
-        JSC::JSValue::decode(JSValue2), JSC::ArgList(),
-        (const char*)arg4));
-}
-JSC__JSValue JSC__JSFunction__constructWithoutAnyArgumentsOrNewTarget(JSC__JSValue JSValue0,
-    JSC__JSGlobalObject* arg1,
-    JSC__Exception** arg2,
-    const unsigned char* arg3)
-{
-    return JSC::JSValue::encode(
-        JSC::construct(arg1, JSC::JSValue::decode(JSValue0), JSC::ArgList(), (const char*)arg3));
-}
+// JSC__JSValue JSC__JSFunction__constructWithArgumentsAndNewTarget(
+//     JSC__JSValue JSValue0, JSC__JSValue JSValue1, JSC__JSGlobalObject* arg2, JSC__JSValue* arg3,
+//     size_t arg4, JSC__Exception** arg5, const unsigned char* arg6)
+// {
+//     auto args = makeArgs(arg3, arg4);
+//     return JSC::JSValue::encode(JSC::construct(arg2, JSC::JSValue::decode(JSValue0),
+//         JSC::JSValue::decode(JSValue0), args,
+//         (const char*)arg6));
+// }
+// JSC__JSValue JSC__JSFunction__constructWithNewTarget(JSC__JSValue JSValue0,
+//     JSC__JSGlobalObject* arg1,
+//     JSC__JSValue JSValue2, JSC__Exception** arg3,
+//     const unsigned char* arg4)
+// {
+//     return JSC::JSValue::encode(JSC::construct(arg1, JSC::JSValue::decode(JSValue0),
+//         JSC::JSValue::decode(JSValue2), JSC::ArgList(),
+//         (const char*)arg4));
+// }
+// JSC__JSValue JSC__JSFunction__constructWithoutAnyArgumentsOrNewTarget(JSC__JSValue JSValue0,
+//     JSC__JSGlobalObject* arg1,
+//     JSC__Exception** arg2,
+//     const unsigned char* arg3)
+// {
+//     return JSC::JSValue::encode(
+//         JSC::construct(arg1, JSC::JSValue::decode(JSValue0), JSC::ArgList(), (const char*)arg3));
+// }
 
 JSC__JSFunction* JSC__JSFunction__createFromNative(JSC__JSGlobalObject* arg0, uint16_t arg1,
     const WTF__String* arg2, void* ctx,
@@ -2035,7 +2039,7 @@ static void fromErrorInstance(ZigException* except, JSC::JSGlobalObject* global,
     except->name = Zig::toZigString(err->sanitizedNameString(global));
     except->runtime_type = err->runtimeTypeForCause();
 
-    auto clientData = Bun::clientData(global->vm());
+    auto clientData = WebCore::clientData(global->vm());
     if (except->code != SYNTAX_ERROR_CODE) {
 
         if (JSC::JSValue syscall = obj->getIfPropertyExists(global, clientData->builtinNames().syscallPublicName())) {
@@ -2643,7 +2647,7 @@ bWTF__String WTF__URL__stringWithoutFragmentIdentifier(WTF__URL* arg0)
 };
 bWTF__StringView WTF__URL__stringWithoutQueryOrFragmentIdentifier(WTF__URL* arg0)
 {
-    auto result = arg0->stringWithoutQueryOrFragmentIdentifier();
+    auto result = arg0->viewWithoutQueryOrFragmentIdentifier();
     return cast<bWTF__StringView>(&result);
 };
 bWTF__URL WTF__URL__truncatedForUseAsBase(WTF__URL* arg0)
diff --git a/src/javascript/jsc/bindings/bindings.zig b/src/javascript/jsc/bindings/bindings.zig
index 6b45fdb1b..ffb7baae0 100644
--- a/src/javascript/jsc/bindings/bindings.zig
+++ b/src/javascript/jsc/bindings/bindings.zig
@@ -19,7 +19,7 @@ pub const JSObject = extern struct {
     pub const shim = Shimmer("JSC", "JSObject", @This());
     bytes: shim.Bytes,
     const cppFn = shim.cppFn;
-    pub const include = "<JavaScriptCore/JSObject.h>";
+    pub const include = "JavaScriptCore/JSObject.h";
     pub const name = "JSC::JSObject";
     pub const namespace = "JSC";
 
@@ -384,7 +384,7 @@ pub const JSCell = extern struct {
     pub const shim = Shimmer("JSC", "JSCell", @This());
     bytes: shim.Bytes,
     const cppFn = shim.cppFn;
-    pub const include = "<JavaScriptCore/JSCell.h>";
+    pub const include = "JavaScriptCore/JSCell.h";
     pub const name = "JSC::JSCell";
     pub const namespace = "JSC";
 
@@ -411,7 +411,7 @@ pub const JSString = extern struct {
     pub const shim = Shimmer("JSC", "JSString", @This());
     bytes: shim.Bytes,
     const cppFn = shim.cppFn;
-    pub const include = "<JavaScriptCore/JSString.h>";
+    pub const include = "JavaScriptCore/JSString.h";
     pub const name = "JSC::JSString";
     pub const namespace = "JSC";
 
@@ -463,7 +463,7 @@ pub const ScriptArguments = extern struct {
     pub const shim = Shimmer("Inspector", "ScriptArguments", @This());
     bytes: shim.Bytes,
     const cppFn = shim.cppFn;
-    pub const include = "<JavaScriptCore/ScriptArguments.h>";
+    pub const include = "JavaScriptCore/ScriptArguments.h";
     pub const name = "Inspector::ScriptArguments";
     pub const namespace = "Inspector";
 
@@ -569,7 +569,7 @@ pub const JSModuleLoader = extern struct {
     pub const shim = Shimmer("JSC", "JSModuleLoader", @This());
     bytes: shim.Bytes,
     const cppFn = shim.cppFn;
-    pub const include = "<JavaScriptCore/JSModuleLoader.h>";
+    pub const include = "JavaScriptCore/JSModuleLoader.h";
     pub const name = "JSC::JSModuleLoader";
     pub const namespace = "JSC";
 
@@ -663,7 +663,7 @@ pub const JSModuleRecord = extern struct {
     pub const shim = Shimmer("JSC", "JSModuleRecord", @This());
     bytes: shim.Bytes,
     const cppFn = shim.cppFn;
-    pub const include = "<JavaScriptCore/JSModuleRecord.h>";
+    pub const include = "JavaScriptCore/JSModuleRecord.h";
     pub const name = "JSC::JSModuleRecord";
     pub const namespace = "JSC";
 
@@ -682,7 +682,7 @@ pub const JSPromise = extern struct {
     pub const shim = Shimmer("JSC", "JSPromise", @This());
     bytes: shim.Bytes,
     const cppFn = shim.cppFn;
-    pub const include = "<JavaScriptCore/JSPromise.h>";
+    pub const include = "JavaScriptCore/JSPromise.h";
     pub const name = "JSC::JSPromise";
     pub const namespace = "JSC";
 
@@ -769,7 +769,7 @@ pub const JSInternalPromise = extern struct {
     pub const shim = Shimmer("JSC", "JSInternalPromise", @This());
     bytes: shim.Bytes,
     const cppFn = shim.cppFn;
-    pub const include = "<JavaScriptCore/JSInternalPromise.h>";
+    pub const include = "JavaScriptCore/JSInternalPromise.h";
     pub const name = "JSC::JSInternalPromise";
     pub const namespace = "JSC";
 
@@ -988,7 +988,7 @@ pub const SourceOrigin = extern struct {
     pub const shim = Shimmer("JSC", "SourceOrigin", @This());
     bytes: shim.Bytes,
     const cppFn = shim.cppFn;
-    pub const include = "<JavaScriptCore/SourceOrigin.h>";
+    pub const include = "JavaScriptCore/SourceOrigin.h";
     pub const name = "JSC::SourceOrigin";
     pub const namespace = "JSC";
 
@@ -1005,7 +1005,7 @@ pub const SourceCode = extern struct {
     pub const shim = Shimmer("JSC", "SourceCode", @This());
     bytes: shim.Bytes,
     const cppFn = shim.cppFn;
-    pub const include = "<JavaScriptCore/SourceProvider.h>";
+    pub const include = "JavaScriptCore/SourceProvider.h";
     pub const name = "JSC::SourceCode";
     pub const namespace = "JSC";
 
@@ -1022,7 +1022,7 @@ pub const JSFunction = extern struct {
     pub const shim = Shimmer("JSC", "JSFunction", @This());
     bytes: shim.Bytes,
     const cppFn = shim.cppFn;
-    pub const include = "<JavaScriptCore/JSFunction.h>";
+    pub const include = "JavaScriptCore/JSFunction.h";
     pub const name = "JSC::JSFunction";
     pub const namespace = "JSC";
 
@@ -1224,7 +1224,7 @@ pub const JSGlobalObject = extern struct {
     pub const shim = Shimmer("JSC", "JSGlobalObject", @This());
     bytes: shim.Bytes,
 
-    pub const include = "<JavaScriptCore/JSGlobalObject.h>";
+    pub const include = "JavaScriptCore/JSGlobalObject.h";
     pub const name = "JSC::JSGlobalObject";
     pub const namespace = "JSC";
 
@@ -1395,7 +1395,7 @@ fn _JSCellStub(comptime str: []const u8) type {
 fn _Bun(comptime str: []const u8) type {
     if (is_bindgen) {
         return opaque {
-            pub const name = "Bun::" ++ str ++ "";
+            pub const name = "WebCore::" ++ str ++ "";
         };
     } else {
         return opaque {};
@@ -1416,7 +1416,7 @@ pub const URL = extern struct {
     pub const shim = Shimmer("WTF", "URL", @This());
     bytes: shim.Bytes,
     const cppFn = shim.cppFn;
-    pub const include = "<wtf/URL.h>";
+    pub const include = "wtf/URL.h";
     pub const name = "WTF::URL";
     pub const namespace = "WTF";
 
@@ -1547,7 +1547,7 @@ pub const String = extern struct {
     pub const shim = Shimmer("WTF", "String", @This());
     bytes: shim.Bytes,
     const cppFn = shim.cppFn;
-    pub const include = "<wtf/text/WTFString.h>";
+    pub const include = "wtf/text/WTFString.h";
     pub const name = "WTF::String";
     pub const namespace = "WTF";
 
@@ -1638,7 +1638,7 @@ pub const JSValue = enum(u64) {
     pub const Type = u64;
     const cppFn = shim.cppFn;
 
-    pub const include = "<JavaScriptCore/JSValue.h>";
+    pub const include = "JavaScriptCore/JSValue.h";
     pub const name = "JSC::JSValue";
     pub const namespace = "JSC";
     pub const zero = @intToEnum(JSValue, @as(u64, 0));
@@ -2430,7 +2430,7 @@ pub const PropertyName = extern struct {
 
     const cppFn = shim.cppFn;
 
-    pub const include = "<JavaScriptCore/PropertyName.h>";
+    pub const include = "JavaScriptCore/PropertyName.h";
     pub const name = "JSC::PropertyName";
     pub const namespace = "JSC";
 
@@ -2463,7 +2463,7 @@ pub const Exception = extern struct {
     pub const Type = JSObject;
     const cppFn = shim.cppFn;
 
-    pub const include = "<JavaScriptCore/Exception.h>";
+    pub const include = "JavaScriptCore/Exception.h";
     pub const name = "JSC::Exception";
     pub const namespace = "JSC";
 
@@ -2502,7 +2502,7 @@ pub const JSLock = extern struct {
 
     const cppFn = shim.cppFn;
 
-    pub const include = "<JavaScriptCore/JSLock.h>";
+    pub const include = "JavaScriptCore/JSLock.h";
     pub const name = "JSC::JSLock";
     pub const namespace = "JSC";
 
@@ -2522,7 +2522,7 @@ pub const VM = extern struct {
 
     const cppFn = shim.cppFn;
 
-    pub const include = "<JavaScriptCore/VM.h>";
+    pub const include = "JavaScriptCore/VM.h";
     pub const name = "JSC::VM";
     pub const namespace = "JSC";
 
@@ -2639,7 +2639,7 @@ pub const ThrowScope = extern struct {
 
     const cppFn = shim.cppFn;
 
-    pub const include = "<JavaScriptCore/ThrowScope.h>";
+    pub const include = "JavaScriptCore/ThrowScope.h";
     pub const name = "JSC::ThrowScope";
     pub const namespace = "JSC";
 
@@ -2678,7 +2678,7 @@ pub const CatchScope = extern struct {
 
     const cppFn = shim.cppFn;
 
-    pub const include = "<JavaScriptCore/CatchScope.h>";
+    pub const include = "JavaScriptCore/CatchScope.h";
     pub const name = "JSC::CatchScope";
     pub const namespace = "JSC";
 
@@ -2711,7 +2711,7 @@ pub const CallFrame = extern struct {
     bytes: shim.Bytes,
     const cppFn = shim.cppFn;
 
-    pub const include = "<JavaScriptCore/CallFrame.h>";
+    pub const include = "JavaScriptCore/CallFrame.h";
     pub const name = "JSC::CallFrame";
     pub const namespace = "JSC";
 
@@ -2767,7 +2767,7 @@ pub const CallFrame = extern struct {
 //
 //
 
-//     pub const include = "<JavaScriptCore/CommonIdentifiers.h>";
+//     pub const include = "JavaScriptCore/CommonIdentifiers.h";
 //     pub const name = "JSC::CommonIdentifiers";
 //     pub const namespace = "JSC";
 
@@ -2795,7 +2795,7 @@ pub const EncodedJSValue = enum(i64) {
     pub const Type = u64;
     const cppFn = shim.cppFn;
 
-    pub const include = "<JavaScriptCore/EncodedJSValue.h>";
+    pub const include = "JavaScriptCore/EncodedJSValue.h";
     pub const name = "JSC::EncodedJSValue";
     pub const namespace = "JSC";
 };
@@ -2805,7 +2805,7 @@ pub const Identifier = extern struct {
     bytes: shim.Bytes,
     const cppFn = shim.cppFn;
 
-    pub const include = "<JavaScriptCore/Identifier.h>";
+    pub const include = "JavaScriptCore/Identifier.h";
     pub const name = "JSC::Identifier";
     pub const namespace = "JSC";
 
@@ -2892,7 +2892,7 @@ pub const StringImpl = extern struct {
     bytes: shim.Bytes,
     const cppFn = shim.cppFn;
 
-    pub const include = "<wtf/text/StringImpl.h>";
+    pub const include = "wtf/text/StringImpl.h";
     pub const name = "WTF::StringImpl";
     pub const namespace = "WTF";
 
@@ -2940,7 +2940,7 @@ pub const ExternalStringImpl = extern struct {
     bytes: shim.Bytes,
     const cppFn = shim.cppFn;
 
-    pub const include = "<wtf/text/ExternalStringImpl.h>";
+    pub const include = "wtf/text/ExternalStringImpl.h";
     pub const name = "WTF::ExternalStringImpl";
     pub const namespace = "WTF";
 
@@ -3015,7 +3015,7 @@ pub const StringView = extern struct {
     bytesA: u64,
     const cppFn = shim.cppFn;
 
-    pub const include = "<wtf/text/StringView.h>";
+    pub const include = "wtf/text/StringView.h";
     pub const name = "WTF::StringView";
     pub const namespace = "WTF";
 
diff --git a/src/javascript/jsc/bindings/bmalloc_heap_ref.h b/src/javascript/jsc/bindings/bmalloc_heap_ref.h
new file mode 100644
index 000000000..d83e48483
--- /dev/null
+++ b/src/javascript/jsc/bindings/bmalloc_heap_ref.h
@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2021 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef BMALLOC_HEAP_REF_H
+#define BMALLOC_HEAP_REF_H
+
+#include <bmalloc/bmalloc_type.h>
+#include <bmalloc/pas_heap_ref.h>
+
+PAS_BEGIN_EXTERN_C;
+
+#define BMALLOC_HEAP_REF_INITIALIZER(passed_type)    \
+    ((pas_heap_ref) {                                \
+        .type = (const pas_heap_type*)(passed_type), \
+        .heap = NULL,                                \
+        .allocator_index = 0 })
+
+#define BMALLOC_PRIMITIVE_HEAP_REF_INITIALIZER_IMPL(passed_type) \
+    ((pas_primitive_heap_ref) {                                  \
+        .base = BMALLOC_HEAP_REF_INITIALIZER(passed_type),       \
+        .cached_index = UINT_MAX })
+
+#define BMALLOC_FLEX_HEAP_REF_INITIALIZER(passed_type) \
+    BMALLOC_PRIMITIVE_HEAP_REF_INITIALIZER_IMPL(passed_type)
+
+#define BMALLOC_AUXILIARY_HEAP_REF_INITIALIZER(passed_type) \
+    BMALLOC_PRIMITIVE_HEAP_REF_INITIALIZER_IMPL(passed_type)
+
+PAS_END_EXTERN_C;
+
+#endif /* BMALLOC_HEAP_REF_H */
diff --git a/src/javascript/jsc/bindings/exports.zig b/src/javascript/jsc/bindings/exports.zig
index 4715b95f0..8c6cb17c9 100644
--- a/src/javascript/jsc/bindings/exports.zig
+++ b/src/javascript/jsc/bindings/exports.zig
@@ -275,7 +275,7 @@ pub const JSErrorCode = enum(u8) {
     URIError = 6,
     AggregateError = 7,
 
-    // StackOverflow & OutOfMemoryError is not an ErrorType in <JavaScriptCore/ErrorType.h> within JSC, so the number here is just totally made up
+    // StackOverflow & OutOfMemoryError is not an ErrorType in "JavaScriptCore/ErrorType.h" within JSC, so the number here is just totally made up
     OutOfMemoryError = 8,
     BundlerError = 252,
     StackOverflow = 253,
diff --git a/src/javascript/jsc/bindings/header-gen.zig b/src/javascript/jsc/bindings/header-gen.zig
index cf8987ab5..612f86215 100644
--- a/src/javascript/jsc/bindings/header-gen.zig
+++ b/src/javascript/jsc/bindings/header-gen.zig
@@ -621,7 +621,7 @@ pub fn HeaderGen(comptime first_import: type, comptime second_import: type, comp
                 \\
                 \\#ifdef __cplusplus
                 \\#include "root.h"
-                \\#include <JavaScriptCore/JSClassRef.h>
+                \\#include "JavaScriptCore/JSClassRef.h"
                 \\#endif
                 \\#include "headers-handwritten.h"
                 \\
diff --git a/src/javascript/jsc/bindings/headers-cpp.h b/src/javascript/jsc/bindings/headers-cpp.h
index 4375e000e..aa51de7e7 100644
--- a/src/javascript/jsc/bindings/headers-cpp.h
+++ b/src/javascript/jsc/bindings/headers-cpp.h
@@ -1,4 +1,4 @@
-//-- AUTOGENERATED FILE -- 1648167213
+//-- AUTOGENERATED FILE -- 1648440945
 // clang-format off
 #pragma once
 
@@ -8,201 +8,201 @@
 
 #include "root.h"
 
-#ifndef INCLUDED__JavaScriptCore_JSObject_h_
-#define INCLUDED__JavaScriptCore_JSObject_h_
-#include <JavaScriptCore/JSObject.h>
+#ifndef INCLUDED_JavaScriptCore_JSObject_h
+#define INCLUDED_JavaScriptCore_JSObject_h
+#include JavaScriptCore/JSObject.h
 #endif
 
 extern "C" const size_t JSC__JSObject_object_size_ = sizeof(JSC::JSObject);
 extern "C" const size_t JSC__JSObject_object_align_ = alignof(JSC::JSObject);
 
-#ifndef INCLUDED__JavaScriptCore_JSCell_h_
-#define INCLUDED__JavaScriptCore_JSCell_h_
-#include <JavaScriptCore/JSCell.h>
+#ifndef INCLUDED_JavaScriptCore_JSCell_h
+#define INCLUDED_JavaScriptCore_JSCell_h
+#include JavaScriptCore/JSCell.h
 #endif
 
 extern "C" const size_t JSC__JSCell_object_size_ = sizeof(JSC::JSCell);
 extern "C" const size_t JSC__JSCell_object_align_ = alignof(JSC::JSCell);
 
-#ifndef INCLUDED__JavaScriptCore_JSString_h_
-#define INCLUDED__JavaScriptCore_JSString_h_
-#include <JavaScriptCore/JSString.h>
+#ifndef INCLUDED_JavaScriptCore_JSString_h
+#define INCLUDED_JavaScriptCore_JSString_h
+#include JavaScriptCore/JSString.h
 #endif
 
 extern "C" const size_t JSC__JSString_object_size_ = sizeof(JSC::JSString);
 extern "C" const size_t JSC__JSString_object_align_ = alignof(JSC::JSString);
 
-#ifndef INCLUDED__JavaScriptCore_ScriptArguments_h_
-#define INCLUDED__JavaScriptCore_ScriptArguments_h_
-#include <JavaScriptCore/ScriptArguments.h>
+#ifndef INCLUDED_JavaScriptCore_ScriptArguments_h
+#define INCLUDED_JavaScriptCore_ScriptArguments_h
+#include JavaScriptCore/ScriptArguments.h
 #endif
 
 extern "C" const size_t Inspector__ScriptArguments_object_size_ = sizeof(Inspector::ScriptArguments);
 extern "C" const size_t Inspector__ScriptArguments_object_align_ = alignof(Inspector::ScriptArguments);
 
-#ifndef INCLUDED__JavaScriptCore_JSModuleLoader_h_
-#define INCLUDED__JavaScriptCore_JSModuleLoader_h_
-#include <JavaScriptCore/JSModuleLoader.h>
+#ifndef INCLUDED_JavaScriptCore_JSModuleLoader_h
+#define INCLUDED_JavaScriptCore_JSModuleLoader_h
+#include JavaScriptCore/JSModuleLoader.h
 #endif
 
 extern "C" const size_t JSC__JSModuleLoader_object_size_ = sizeof(JSC::JSModuleLoader);
 extern "C" const size_t JSC__JSModuleLoader_object_align_ = alignof(JSC::JSModuleLoader);
 
-#ifndef INCLUDED__JavaScriptCore_JSModuleRecord_h_
-#define INCLUDED__JavaScriptCore_JSModuleRecord_h_
-#include <JavaScriptCore/JSModuleRecord.h>
+#ifndef INCLUDED_JavaScriptCore_JSModuleRecord_h
+#define INCLUDED_JavaScriptCore_JSModuleRecord_h
+#include JavaScriptCore/JSModuleRecord.h
 #endif
 
 extern "C" const size_t JSC__JSModuleRecord_object_size_ = sizeof(JSC::JSModuleRecord);
 extern "C" const size_t JSC__JSModuleRecord_object_align_ = alignof(JSC::JSModuleRecord);
 
-#ifndef INCLUDED__JavaScriptCore_JSPromise_h_
-#define INCLUDED__JavaScriptCore_JSPromise_h_
-#include <JavaScriptCore/JSPromise.h>
+#ifndef INCLUDED_JavaScriptCore_JSPromise_h
+#define INCLUDED_JavaScriptCore_JSPromise_h
+#include JavaScriptCore/JSPromise.h
 #endif
 
 extern "C" const size_t JSC__JSPromise_object_size_ = sizeof(JSC::JSPromise);
 extern "C" const size_t JSC__JSPromise_object_align_ = alignof(JSC::JSPromise);
 
-#ifndef INCLUDED__JavaScriptCore_JSInternalPromise_h_
-#define INCLUDED__JavaScriptCore_JSInternalPromise_h_
-#include <JavaScriptCore/JSInternalPromise.h>
+#ifndef INCLUDED_JavaScriptCore_JSInternalPromise_h
+#define INCLUDED_JavaScriptCore_JSInternalPromise_h
+#include JavaScriptCore/JSInternalPromise.h
 #endif
 
 extern "C" const size_t JSC__JSInternalPromise_object_size_ = sizeof(JSC::JSInternalPromise);
 extern "C" const size_t JSC__JSInternalPromise_object_align_ = alignof(JSC::JSInternalPromise);
 
-#ifndef INCLUDED__JavaScriptCore_SourceOrigin_h_
-#define INCLUDED__JavaScriptCore_SourceOrigin_h_
-#include <JavaScriptCore/SourceOrigin.h>
+#ifndef INCLUDED_JavaScriptCore_SourceOrigin_h
+#define INCLUDED_JavaScriptCore_SourceOrigin_h
+#include JavaScriptCore/SourceOrigin.h
 #endif
 
 extern "C" const size_t JSC__SourceOrigin_object_size_ = sizeof(JSC::SourceOrigin);
 extern "C" const size_t JSC__SourceOrigin_object_align_ = alignof(JSC::SourceOrigin);
 
-#ifndef INCLUDED__JavaScriptCore_SourceProvider_h_
-#define INCLUDED__JavaScriptCore_SourceProvider_h_
-#include <JavaScriptCore/SourceProvider.h>
+#ifndef INCLUDED_JavaScriptCore_SourceProvider_h
+#define INCLUDED_JavaScriptCore_SourceProvider_h
+#include JavaScriptCore/SourceProvider.h
 #endif
 
 extern "C" const size_t JSC__SourceCode_object_size_ = sizeof(JSC::SourceCode);
 extern "C" const size_t JSC__SourceCode_object_align_ = alignof(JSC::SourceCode);
 
-#ifndef INCLUDED__JavaScriptCore_JSFunction_h_
-#define INCLUDED__JavaScriptCore_JSFunction_h_
-#include <JavaScriptCore/JSFunction.h>
+#ifndef INCLUDED_JavaScriptCore_JSFunction_h
+#define INCLUDED_JavaScriptCore_JSFunction_h
+#include JavaScriptCore/JSFunction.h
 #endif
 
 extern "C" const size_t JSC__JSFunction_object_size_ = sizeof(JSC::JSFunction);
 extern "C" const size_t JSC__JSFunction_object_align_ = alignof(JSC::JSFunction);
 
-#ifndef INCLUDED__JavaScriptCore_JSGlobalObject_h_
-#define INCLUDED__JavaScriptCore_JSGlobalObject_h_
-#include <JavaScriptCore/JSGlobalObject.h>
+#ifndef INCLUDED_JavaScriptCore_JSGlobalObject_h
+#define INCLUDED_JavaScriptCore_JSGlobalObject_h
+#include JavaScriptCore/JSGlobalObject.h
 #endif
 
 extern "C" const size_t JSC__JSGlobalObject_object_size_ = sizeof(JSC::JSGlobalObject);
 extern "C" const size_t JSC__JSGlobalObject_object_align_ = alignof(JSC::JSGlobalObject);
 
-#ifndef INCLUDED__wtf_URL_h_
-#define INCLUDED__wtf_URL_h_
-#include <wtf/URL.h>
+#ifndef INCLUDED_wtf_URL_h
+#define INCLUDED_wtf_URL_h
+#include wtf/URL.h
 #endif
 
 extern "C" const size_t WTF__URL_object_size_ = sizeof(WTF::URL);
 extern "C" const size_t WTF__URL_object_align_ = alignof(WTF::URL);
 
-#ifndef INCLUDED__wtf_text_WTFString_h_
-#define INCLUDED__wtf_text_WTFString_h_
-#include <wtf/text/WTFString.h>
+#ifndef INCLUDED_wtf_text_WTFString_h
+#define INCLUDED_wtf_text_WTFString_h
+#include wtf/text/WTFString.h
 #endif
 
 extern "C" const size_t WTF__String_object_size_ = sizeof(WTF::String);
 extern "C" const size_t WTF__String_object_align_ = alignof(WTF::String);
 
-#ifndef INCLUDED__JavaScriptCore_JSValue_h_
-#define INCLUDED__JavaScriptCore_JSValue_h_
-#include <JavaScriptCore/JSValue.h>
+#ifndef INCLUDED_JavaScriptCore_JSValue_h
+#define INCLUDED_JavaScriptCore_JSValue_h
+#include JavaScriptCore/JSValue.h
 #endif
 
 extern "C" const size_t JSC__JSValue_object_size_ = sizeof(JSC::JSValue);
 extern "C" const size_t JSC__JSValue_object_align_ = alignof(JSC::JSValue);
 
-#ifndef INCLUDED__JavaScriptCore_PropertyName_h_
-#define INCLUDED__JavaScriptCore_PropertyName_h_
-#include <JavaScriptCore/PropertyName.h>
+#ifndef INCLUDED_JavaScriptCore_PropertyName_h
+#define INCLUDED_JavaScriptCore_PropertyName_h
+#include JavaScriptCore/PropertyName.h
 #endif
 
 extern "C" const size_t JSC__PropertyName_object_size_ = sizeof(JSC::PropertyName);
 extern "C" const size_t JSC__PropertyName_object_align_ = alignof(JSC::PropertyName);
 
-#ifndef INCLUDED__JavaScriptCore_Exception_h_
-#define INCLUDED__JavaScriptCore_Exception_h_
-#include <JavaScriptCore/Exception.h>
+#ifndef INCLUDED_JavaScriptCore_Exception_h
+#define INCLUDED_JavaScriptCore_Exception_h
+#include JavaScriptCore/Exception.h
 #endif
 
 extern "C" const size_t JSC__Exception_object_size_ = sizeof(JSC::Exception);
 extern "C" const size_t JSC__Exception_object_align_ = alignof(JSC::Exception);
 
-#ifndef INCLUDED__JavaScriptCore_VM_h_
-#define INCLUDED__JavaScriptCore_VM_h_
-#include <JavaScriptCore/VM.h>
+#ifndef INCLUDED_JavaScriptCore_VM_h
+#define INCLUDED_JavaScriptCore_VM_h
+#include JavaScriptCore/VM.h
 #endif
 
 extern "C" const size_t JSC__VM_object_size_ = sizeof(JSC::VM);
 extern "C" const size_t JSC__VM_object_align_ = alignof(JSC::VM);
 
-#ifndef INCLUDED__JavaScriptCore_ThrowScope_h_
-#define INCLUDED__JavaScriptCore_ThrowScope_h_
-#include <JavaScriptCore/ThrowScope.h>
+#ifndef INCLUDED_JavaScriptCore_ThrowScope_h
+#define INCLUDED_JavaScriptCore_ThrowScope_h
+#include JavaScriptCore/ThrowScope.h
 #endif
 
 extern "C" const size_t JSC__ThrowScope_object_size_ = sizeof(JSC::ThrowScope);
 extern "C" const size_t JSC__ThrowScope_object_align_ = alignof(JSC::ThrowScope);
 
-#ifndef INCLUDED__JavaScriptCore_CatchScope_h_
-#define INCLUDED__JavaScriptCore_CatchScope_h_
-#include <JavaScriptCore/CatchScope.h>
+#ifndef INCLUDED_JavaScriptCore_CatchScope_h
+#define INCLUDED_JavaScriptCore_CatchScope_h
+#include JavaScriptCore/CatchScope.h
 #endif
 
 extern "C" const size_t JSC__CatchScope_object_size_ = sizeof(JSC::CatchScope);
 extern "C" const size_t JSC__CatchScope_object_align_ = alignof(JSC::CatchScope);
 
-#ifndef INCLUDED__JavaScriptCore_CallFrame_h_
-#define INCLUDED__JavaScriptCore_CallFrame_h_
-#include <JavaScriptCore/CallFrame.h>
+#ifndef INCLUDED_JavaScriptCore_CallFrame_h
+#define INCLUDED_JavaScriptCore_CallFrame_h
+#include JavaScriptCore/CallFrame.h
 #endif
 
 extern "C" const size_t JSC__CallFrame_object_size_ = sizeof(JSC::CallFrame);
 extern "C" const size_t JSC__CallFrame_object_align_ = alignof(JSC::CallFrame);
 
-#ifndef INCLUDED__JavaScriptCore_Identifier_h_
-#define INCLUDED__JavaScriptCore_Identifier_h_
-#include <JavaScriptCore/Identifier.h>
+#ifndef INCLUDED_JavaScriptCore_Identifier_h
+#define INCLUDED_JavaScriptCore_Identifier_h
+#include JavaScriptCore/Identifier.h
 #endif
 
 extern "C" const size_t JSC__Identifier_object_size_ = sizeof(JSC::Identifier);
 extern "C" const size_t JSC__Identifier_object_align_ = alignof(JSC::Identifier);
 
-#ifndef INCLUDED__wtf_text_StringImpl_h_
-#define INCLUDED__wtf_text_StringImpl_h_
-#include <wtf/text/StringImpl.h>
+#ifndef INCLUDED_wtf_text_StringImpl_h
+#define INCLUDED_wtf_text_StringImpl_h
+#include wtf/text/StringImpl.h
 #endif
 
 extern "C" const size_t WTF__StringImpl_object_size_ = sizeof(WTF::StringImpl);
 extern "C" const size_t WTF__StringImpl_object_align_ = alignof(WTF::StringImpl);
 
-#ifndef INCLUDED__wtf_text_ExternalStringImpl_h_
-#define INCLUDED__wtf_text_ExternalStringImpl_h_
-#include <wtf/text/ExternalStringImpl.h>
+#ifndef INCLUDED_wtf_text_ExternalStringImpl_h
+#define INCLUDED_wtf_text_ExternalStringImpl_h
+#include wtf/text/ExternalStringImpl.h
 #endif
 
 extern "C" const size_t WTF__ExternalStringImpl_object_size_ = sizeof(WTF::ExternalStringImpl);
 extern "C" const size_t WTF__ExternalStringImpl_object_align_ = alignof(WTF::ExternalStringImpl);
 
-#ifndef INCLUDED__wtf_text_StringView_h_
-#define INCLUDED__wtf_text_StringView_h_
-#include <wtf/text/StringView.h>
+#ifndef INCLUDED_wtf_text_StringView_h
+#define INCLUDED_wtf_text_StringView_h
+#include wtf/text/StringView.h
 #endif
 
 extern "C" const size_t WTF__StringView_object_size_ = sizeof(WTF::StringView);
diff --git a/src/javascript/jsc/bindings/headers.h b/src/javascript/jsc/bindings/headers.h
index dddfb5cb4..95f5ec3a9 100644
--- a/src/javascript/jsc/bindings/headers.h
+++ b/src/javascript/jsc/bindings/headers.h
@@ -1,10 +1,10 @@
 // clang-format: off
-//-- AUTOGENERATED FILE -- 1648167213
+//-- AUTOGENERATED FILE -- 1648440945
 #pragma once
 
-#include <stdbool.h>
 #include <stddef.h>
 #include <stdint.h>
+#include <stdbool.h>
 
 #ifdef __cplusplus
 #define AUTO_EXTERN_C extern "C"
@@ -23,7 +23,7 @@ typedef void* JSClassRef;
 
 #ifdef __cplusplus
 #include "root.h"
-#include <JavaScriptCore/JSClassRef.h>
+#include "JavaScriptCore/JSClassRef.h"
 #endif
 #include "headers-handwritten.h"
 typedef struct bJSC__SourceCode {
diff --git a/src/javascript/jsc/bindings/helpers.h b/src/javascript/jsc/bindings/helpers.h
index fc9174a38..392bf6070 100644
--- a/src/javascript/jsc/bindings/helpers.h
+++ b/src/javascript/jsc/bindings/helpers.h
@@ -1,16 +1,17 @@
 #pragma once
 
-#include "headers.h"
 #include "root.h"
 
-#include <JavaScriptCore/Error.h>
-#include <JavaScriptCore/Exception.h>
-#include <JavaScriptCore/Identifier.h>
-#include <JavaScriptCore/JSCInlines.h>
-#include <JavaScriptCore/JSString.h>
-#include <JavaScriptCore/JSValueInternal.h>
-#include <JavaScriptCore/ThrowScope.h>
-#include <JavaScriptCore/VM.h>
+#include "headers.h"
+
+#include "JavaScriptCore/Error.h"
+#include "JavaScriptCore/Exception.h"
+#include "JavaScriptCore/Identifier.h"
+#include "JavaScriptCore/JSGlobalObject.h"
+#include "JavaScriptCore/JSString.h"
+#include "JavaScriptCore/JSValueInternal.h"
+#include "JavaScriptCore/ThrowScope.h"
+#include "JavaScriptCore/VM.h"
 
 template<class CppType, typename ZigType> class Wrap {
 public:
diff --git a/src/javascript/jsc/bindings/objects.h b/src/javascript/jsc/bindings/objects.h
index 9d4d6d38d..dc3030622 100644
--- a/src/javascript/jsc/bindings/objects.h
+++ b/src/javascript/jsc/bindings/objects.h
@@ -3,9 +3,9 @@
 // #include "root.h"
 // #include "headers.h"
 
-// #include <JavaScriptCore/JSObject.h>
-// #include <JavaScriptCore/JSCInlines.h>
-// #include <JavaScriptCore/InternalFunction.h>
+// #include "JavaScriptCore/JSObject.h"
+// #include "JavaScriptCore/JSCInlines.h"
+// #include "JavaScriptCore/InternalFunction.h"
 
 // namespace Zig {
 
diff --git a/src/javascript/jsc/bindings/root.h b/src/javascript/jsc/bindings/root.h
index 0d120977e..aeb22dbab 100644
--- a/src/javascript/jsc/bindings/root.h
+++ b/src/javascript/jsc/bindings/root.h
@@ -2,7 +2,7 @@
 
 /*
  * Copyright (C) 2006-2021 Apple Inc. All rights reserved.
- * Copyright (C) 2006 Samuel Weinig <sam.weinig@gmail.com>
+ * Copyright (C) 2006 Samuel Weinig "sam.weinig@gmail.com"
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ -34,16 +34,14 @@
 #define JSC_MAC_VERSION_TBA 0
 #define JSC_IOS_VERSION_TBA 0
 
-#include <wtf/ExportMacros.h>
+#include "wtf/ExportMacros.h"
 
 #if !defined(JS_EXPORT_PRIVATE)
 
 #if defined(BUILDING_JavaScriptCore) || defined(STATICALLY_LINKED_WITH_JavaScriptCore)
 #define JS_EXPORT_PRIVATE WTF_EXPORT_DECLARATION
-#define WEBCORE_EXPORT WTF_EXPORT_DECLARATION
 #else
 #define JS_EXPORT_PRIVATE WTF_IMPORT_DECLARATION
-#define WEBCORE_EXPORT WTF_IMPORT_DECLARATION
 #endif
 
 #endif
@@ -51,10 +49,10 @@
 #ifdef __cplusplus
 #undef new
 #undef delete
-#include <wtf/FastMalloc.h>
+#include "wtf/FastMalloc.h"
 #endif
 
-#include <wtf/DisallowCType.h>
+#include "wtf/DisallowCType.h"
 
 /* Disabling warning C4206: nonstandard extension used: translation unit is empty.
    By design, we rely on #define flags to make some translation units empty.
@@ -64,9 +62,11 @@
 #pragma warning(disable : 4206)
 #endif
 
-#ifdef USE_FOUNDATION
-#include <CoreFoundation/CoreFoundation.h>
+#ifndef WEBCORE_EXPORT
+#define WEBCORE_EXPORT JS_EXPORT_PRIVATE
 #endif
 
-#include <JavaScriptCore/Heap.h>
-#include <wtf/PlatformCallingConventions.h>
\ No newline at end of file
+#include "wtf/PlatformCallingConventions.h"
+#include "JavaScriptCore/Strong.h"
+#include "JavaScriptCore/Weak.h"
+#include "JavaScriptCore/WeakInlines.h"
\ No newline at end of file
diff --git a/src/javascript/jsc/bindings/webcore/ActiveDOMObject.h b/src/javascript/jsc/bindings/webcore/ActiveDOMObject.h
new file mode 100644
index 000000000..e69de29bb
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/ActiveDOMObject.h
diff --git a/src/javascript/jsc/bindings/webcore/BufferSource.h b/src/javascript/jsc/bindings/webcore/BufferSource.h
new file mode 100644
index 000000000..ee78e38d1
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/BufferSource.h
@@ -0,0 +1,114 @@
+/*
+ * Copyright (C) 2016 Igalia S.L.
+ * Copyright (C) 2021 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "JavaScriptCore/ArrayBuffer.h"
+#include "JavaScriptCore/ArrayBufferView.h"
+#include "wtf/RefPtr.h"
+#include <variant>
+
+namespace WebCore {
+
+class BufferSource {
+public:
+    using VariantType = std::variant<RefPtr<JSC::ArrayBufferView>, RefPtr<JSC::ArrayBuffer>>;
+
+    BufferSource() {}
+    BufferSource(VariantType&& variant)
+        : m_variant(WTFMove(variant))
+    {
+    }
+
+    const VariantType& variant() const { return m_variant; }
+
+    const uint8_t* data() const
+    {
+        return std::visit([](auto& buffer) -> const uint8_t* {
+            return buffer ? static_cast<const uint8_t*>(buffer->data()) : nullptr;
+        },
+            m_variant);
+    }
+
+    void* mutableData() const
+    {
+        return std::visit([](auto& buffer) -> void* {
+            return buffer->data();
+        },
+            m_variant);
+    }
+
+    size_t length() const
+    {
+        return std::visit([](auto& buffer) -> size_t {
+            return buffer ? buffer->byteLength() : 0;
+        },
+            m_variant);
+    }
+
+    template<class Encoder> void encode(Encoder&) const;
+    template<class Decoder> static std::optional<BufferSource> decode(Decoder&);
+
+private:
+    VariantType m_variant;
+};
+
+template<class Encoder>
+void BufferSource::encode(Encoder& encoder) const
+{
+    encoder << static_cast<uint64_t>(length());
+    if (!length())
+        return;
+
+    encoder.encodeFixedLengthData(data(), length() * sizeof(uint8_t), alignof(uint8_t));
+}
+
+template<class Decoder>
+std::optional<BufferSource> BufferSource::decode(Decoder& decoder)
+{
+    std::optional<uint64_t> size;
+    decoder >> size;
+    if (!size)
+        return std::nullopt;
+    if (!*size)
+        return BufferSource();
+
+    auto dataSize = CheckedSize { *size };
+    if (UNLIKELY(dataSize.hasOverflowed()))
+        return std::nullopt;
+
+    const uint8_t* data = decoder.decodeFixedLengthReference(dataSize, alignof(uint8_t));
+    if (!data)
+        return std::nullopt;
+    return BufferSource(JSC::ArrayBuffer::tryCreate(static_cast<const void*>(data), dataSize.value()));
+}
+
+inline BufferSource toBufferSource(const uint8_t* data, size_t length)
+{
+    return BufferSource(JSC::ArrayBuffer::tryCreate(data, length));
+}
+
+} // namespace WebCore
diff --git a/src/javascript/jsc/bindings/webcore/DOMClientIsoSubspaces.h b/src/javascript/jsc/bindings/webcore/DOMClientIsoSubspaces.h
new file mode 100644
index 000000000..1a75fa518
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/DOMClientIsoSubspaces.h
@@ -0,0 +1,874 @@
+#pragma once
+
+#include "root.h"
+
+#include "wtf/FastMalloc.h"
+#include "wtf/Noncopyable.h"
+
+namespace WebCore {
+using namespace JSC;
+
+class DOMClientIsoSubspaces {
+    WTF_MAKE_NONCOPYABLE(DOMClientIsoSubspaces);
+    WTF_MAKE_FAST_ALLOCATED(DOMClientIsoSubspaces);
+
+public:
+    DOMClientIsoSubspaces() = default;
+
+    std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForGlobalObject;
+
+    std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDOMException;
+    std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDOMFormData;
+    std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDOMFormDataIterator;
+    std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDOMURL;
+    std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForURLSearchParams;
+
+    std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForURLSearchParamsIterator;
+
+    std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForExposedToWorkerAndWindow;
+
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForTouch;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForTouchEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForTouchList;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForInternalSettingsGenerated;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForGPU;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForGPUAdapter;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForGPUBindGroup;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForGPUBindGroupLayout;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForGPUBuffer;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForGPUBufferUsage;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForGPUCanvasContext;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForGPUColorWrite;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForGPUCommandBuffer;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForGPUCommandEncoder;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForGPUCompilationInfo;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForGPUCompilationMessage;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForGPUComputePassEncoder;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForGPUComputePipeline;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForGPUDevice;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForGPUDeviceLostInfo;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForGPUExternalTexture;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForGPUMapMode;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForGPUOutOfMemoryError;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForGPUPipelineLayout;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForGPUQuerySet;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForGPUQueue;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForGPURenderBundle;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForGPURenderBundleEncoder;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForGPURenderPassEncoder;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForGPURenderPipeline;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForGPUSampler;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForGPUShaderModule;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForGPUShaderStage;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForGPUSupportedFeatures;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForGPUSupportedLimits;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForGPUTexture;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForGPUTextureUsage;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForGPUTextureView;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForGPUUncapturedErrorEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForGPUValidationError;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebKitPlaybackTargetAvailabilityEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForApplePayCancelEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForApplePayCouponCodeChangedEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForApplePayError;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForApplePayPaymentAuthorizedEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForApplePayPaymentMethodSelectedEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForApplePaySession;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForApplePaySetup;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForApplePaySetupFeature;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForApplePayShippingContactSelectedEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForApplePayShippingMethodSelectedEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForApplePayValidateMerchantEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForClipboard;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForClipboardItem;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDOMCache;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDOMCacheStorage;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForContactsManager;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForBasicCredential;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCredentialsContainer;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForMediaKeyMessageEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForMediaKeySession;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForMediaKeyStatusMap;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForMediaKeyStatusMapIterator;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForMediaKeySystemAccess;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForMediaKeys;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebKitMediaKeyMessageEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebKitMediaKeyNeededEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebKitMediaKeySession;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebKitMediaKeys;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDOMFileSystem;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForFileSystemDirectoryEntry;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForFileSystemDirectoryReader;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForFileSystemEntry;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForFileSystemFileEntry;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForFetchHeaders;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForFetchHeadersIterator;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForFetchRequest;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForFetchResponse;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForFileSystemDirectoryHandle;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForFileSystemFileHandle;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForFileSystemHandle;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForFileSystemSyncAccessHandle;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForGamepad;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForGamepadButton;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForGamepadEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForGeolocation;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForGeolocationCoordinates;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForGeolocationPosition;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForGeolocationPositionError;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHighlight;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHighlightRegister;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForIDBCursor;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForIDBCursorWithValue;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForIDBDatabase;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForIDBFactory;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForIDBIndex;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForIDBKeyRange;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForIDBObjectStore;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForIDBOpenDBRequest;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForIDBRequest;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForIDBTransaction;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForIDBVersionChangeEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForMediaCapabilities;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForMediaControlsHost;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForBlobEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForMediaRecorder;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForMediaRecorderErrorEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForMediaMetadata;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForMediaSession;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForMediaSessionCoordinator;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForMediaSource;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSourceBuffer;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSourceBufferList;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForVideoPlaybackQuality;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCanvasCaptureMediaStreamTrack;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForMediaDeviceInfo;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForMediaDevices;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForMediaStream;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForMediaStreamTrack;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForMediaStreamTrackEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForOverconstrainedError;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForOverconstrainedErrorEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForRTCCertificate;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForRTCDTMFSender;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForRTCDTMFToneChangeEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForRTCDataChannel;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForRTCDataChannelEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForRTCDtlsTransport;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForRTCEncodedAudioFrame;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForRTCEncodedVideoFrame;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForRTCError;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForRTCErrorEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForRTCIceCandidate;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForRTCIceTransport;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForRTCPeerConnection;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForRTCPeerConnectionIceErrorEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForRTCPeerConnectionIceEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForRTCRtpReceiver;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForRTCRtpSFrameTransform;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForRTCRtpSFrameTransformErrorEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForRTCRtpScriptTransform;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForRTCRtpScriptTransformer;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForRTCRtpSender;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForRTCRtpTransceiver;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForRTCSctpTransport;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForRTCSessionDescription;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForRTCStatsReport;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForRTCTrackEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForRTCTransformEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLModelElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForNotification;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForNotificationEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForMerchantValidationEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForPaymentAddress;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForPaymentMethodChangeEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForPaymentRequest;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForPaymentRequestUpdateEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForPaymentResponse;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForPermissionStatus;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForPermissions;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForPictureInPictureEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForPictureInPictureWindow;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForPushEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForPushManager;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForPushMessageData;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForPushSubscription;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForPushSubscriptionChangeEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForPushSubscriptionOptions;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForRemotePlayback;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSpeechRecognition;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSpeechRecognitionAlternative;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSpeechRecognitionErrorEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSpeechRecognitionEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSpeechRecognitionResult;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSpeechRecognitionResultList;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSpeechSynthesis;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSpeechSynthesisErrorEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSpeechSynthesisEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSpeechSynthesisUtterance;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSpeechSynthesisVoice;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForStorageManager;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForByteLengthQueuingStrategy;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCountQueuingStrategy;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForReadableByteStreamController;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForReadableStream;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForReadableStreamBYOBReader;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForReadableStreamBYOBRequest;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForReadableStreamDefaultController;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForReadableStreamDefaultReader;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForReadableStreamSink;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForReadableStreamSource;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForTransformStream;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForTransformStreamDefaultController;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWritableStream;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWritableStreamDefaultController;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWritableStreamDefaultWriter;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWritableStreamSink;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebLock;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebLockManager;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForAnalyserNode;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForAudioBuffer;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForAudioBufferSourceNode;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForAudioContext;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForAudioDestinationNode;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForAudioListener;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForAudioNode;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForAudioParam;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForAudioParamMap;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForAudioProcessingEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForAudioScheduledSourceNode;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForAudioWorklet;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForAudioWorkletGlobalScope;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForAudioWorkletNode;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForAudioWorkletProcessor;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForBaseAudioContext;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForBiquadFilterNode;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForChannelMergerNode;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForChannelSplitterNode;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForConstantSourceNode;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForConvolverNode;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDelayNode;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDynamicsCompressorNode;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForGainNode;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForIIRFilterNode;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForMediaElementAudioSourceNode;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForMediaStreamAudioDestinationNode;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForMediaStreamAudioSourceNode;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForOfflineAudioCompletionEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForOfflineAudioContext;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForOscillatorNode;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForPannerNode;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForPeriodicWave;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForScriptProcessorNode;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForStereoPannerNode;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWaveShaperNode;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForAuthenticatorAssertionResponse;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForAuthenticatorAttestationResponse;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForAuthenticatorResponse;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForPublicKeyCredential;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForVideoColorSpace;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDatabase;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSQLError;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSQLResultSet;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSQLResultSetRowList;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSQLTransaction;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCloseEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebSocket;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebXRBoundedReferenceSpace;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebXRFrame;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebXRHand;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebXRHandIterator;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebXRInputSource;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebXRInputSourceArray;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebXRInputSourceArrayIterator;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebXRJointPose;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebXRJointSpace;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebXRLayer;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebXRPose;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebXRReferenceSpace;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebXRRenderState;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebXRRigidTransform;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebXRSession;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebXRSpace;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebXRSystem;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebXRView;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebXRViewerPose;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebXRViewport;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebXRWebGLLayer;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForXRInputSourceEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForXRInputSourcesChangeEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForXRReferenceSpaceEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForXRSessionEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForAnimationEffect;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForAnimationPlaybackEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForAnimationTimeline;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCSSAnimation;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCSSTransition;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCustomEffect;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDocumentTimeline;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForKeyframeEffect;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebAnimation;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCryptoKey;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSubtleCrypto;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCSSConditionRule;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCSSCounterStyleRule;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCSSFontFaceRule;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCSSFontPaletteValuesRule;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCSSGroupingRule;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCSSImportRule;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCSSKeyframeRule;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCSSKeyframesRule;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCSSLayerBlockRule;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCSSLayerStatementRule;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCSSMediaRule;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCSSNamespaceRule;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCSSPageRule;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCSSPaintSize;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCSSRule;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCSSRuleList;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCSSStyleDeclaration;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCSSStyleRule;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCSSStyleSheet;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCSSSupportsRule;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCSSUnknownRule;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDOMCSSNamespace;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDOMMatrix;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDOMMatrixReadOnly;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDeprecatedCSSOMCounter;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDeprecatedCSSOMPrimitiveValue;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDeprecatedCSSOMRGBColor;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDeprecatedCSSOMRect;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDeprecatedCSSOMValue;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDeprecatedCSSOMValueList;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForFontFace;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForFontFaceSet;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForFontFaceSetIterator;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForMediaList;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForMediaQueryList;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForMediaQueryListEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForStyleMedia;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForStyleSheet;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForStyleSheetList;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCSSKeywordValue;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCSSNumericValue;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCSSOMVariableReferenceValue;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCSSStyleImageValue;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCSSStyleValue;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCSSUnitValue;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCSSUnparsedValue;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCSSUnparsedValueIterator;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForStylePropertyMap;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForStylePropertyMapReadOnly;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCSSMathInvert;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCSSMathMax;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCSSMathMin;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCSSMathNegate;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCSSMathProduct;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCSSMathSum;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCSSMathValue;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCSSNumericArray;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCSSNumericArrayIterator;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCSSMatrixComponent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCSSPerspective;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCSSRotate;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCSSScale;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCSSSkew;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCSSSkewX;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCSSSkewY;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCSSTransformComponent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCSSTransformValue;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCSSTransformValueIterator;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCSSTranslate;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForAbortController;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForAbortSignal;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForAbstractRange;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForAnimationEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForAttr;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForBeforeUnloadEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForBroadcastChannel;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCDATASection;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCharacterData;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForClipboardEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForComment;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCompositionEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCustomElementRegistry;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCustomEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDOMException;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDOMImplementation;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDOMPoint;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDOMPointReadOnly;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDOMQuad;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDOMRect;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDOMRectList;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDOMRectReadOnly;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDOMStringList;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDOMStringMap;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDataTransfer;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDataTransferItem;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDataTransferItemList;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDeviceMotionEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDeviceOrientationEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDocument;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDocumentFragment;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDocumentType;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDragEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForErrorEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForEventListener;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForEventTarget;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForFocusEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForFormDataEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHashChangeEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForIdleDeadline;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForInputEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForKeyboardEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForMessageChannel;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForMessageEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForMessagePort;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForMouseEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForMutationEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForMutationObserver;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForMutationRecord;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForNamedNodeMap;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForNode;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForNodeIterator;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForNodeList;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForNodeListIterator;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForOverflowEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForPageTransitionEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForPointerEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForPopStateEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForProcessingInstruction;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForProgressEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForPromiseRejectionEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForRange;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSecurityPolicyViolationEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForShadowRoot;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForStaticRange;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForText;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForTextDecoder;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForTextDecoderStream;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForTextDecoderStreamDecoder;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForTextEncoder;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForTextEncoderStream;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForTextEncoderStreamEncoder;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForTextEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForTransitionEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForTreeWalker;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForUIEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWheelEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForXMLDocument;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForBlob;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForFile;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForFileList;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForFileReader;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForFileReaderSync;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDOMFormData;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDOMFormDataIterator;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDOMTokenList;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDOMTokenListIterator;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDOMURL;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLAllCollection;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLAnchorElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLAreaElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLAttachmentElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLAudioElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLBRElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLBaseElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLBodyElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLButtonElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLCanvasElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLCollection;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLDListElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLDataElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLDataListElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLDetailsElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLDialogElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLDirectoryElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLDivElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLDocument;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLEmbedElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLFieldSetElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLFontElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLFormControlsCollection;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLFormElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLFrameElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLFrameSetElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLHRElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLHeadElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLHeadingElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLHtmlElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLIFrameElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLImageElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLInputElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLLIElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLLabelElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLLegendElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLLinkElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLMapElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLMarqueeElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLMediaElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLMenuElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLMenuItemElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLMetaElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLMeterElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLModElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLOListElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLObjectElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLOptGroupElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLOptionElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLOptionsCollection;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLOutputElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLParagraphElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLParamElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLPictureElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLPreElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLProgressElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLQuoteElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLScriptElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLSelectElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLSlotElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLSourceElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLSpanElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLStyleElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLTableCaptionElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLTableCellElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLTableColElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLTableElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLTableRowElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLTableSectionElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLTemplateElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLTextAreaElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLTimeElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLTitleElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLTrackElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLUListElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLUnknownElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHTMLVideoElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForImageBitmap;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForImageData;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForMediaController;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForMediaEncryptedEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForMediaError;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForOffscreenCanvas;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForRadioNodeList;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSubmitEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForTextMetrics;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForTimeRanges;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForURLSearchParams;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForURLSearchParamsIterator;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForValidityState;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebKitMediaKeyError;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForANGLEInstancedArrays;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCanvasGradient;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCanvasPattern;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCanvasRenderingContext2D;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForEXTBlendMinMax;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForEXTColorBufferFloat;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForEXTColorBufferHalfFloat;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForEXTFloatBlend;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForEXTFragDepth;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForEXTShaderTextureLOD;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForEXTTextureCompressionRGTC;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForEXTTextureFilterAnisotropic;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForEXTsRGB;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForImageBitmapRenderingContext;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForKHRParallelShaderCompile;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForOESElementIndexUint;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForOESFBORenderMipmap;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForOESStandardDerivatives;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForOESTextureFloat;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForOESTextureFloatLinear;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForOESTextureHalfFloat;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForOESTextureHalfFloatLinear;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForOESVertexArrayObject;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForOffscreenCanvasRenderingContext2D;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForPaintRenderingContext2D;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForPath2D;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebGL2RenderingContext;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebGLActiveInfo;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebGLBuffer;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebGLColorBufferFloat;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebGLCompressedTextureASTC;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebGLCompressedTextureATC;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebGLCompressedTextureETC;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebGLCompressedTextureETC1;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebGLCompressedTexturePVRTC;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebGLCompressedTextureS3TC;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebGLCompressedTextureS3TCsRGB;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebGLContextEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebGLDebugRendererInfo;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebGLDebugShaders;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebGLDepthTexture;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebGLDrawBuffers;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebGLFramebuffer;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebGLLoseContext;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebGLMultiDraw;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebGLProgram;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebGLQuery;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebGLRenderbuffer;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebGLRenderingContext;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebGLSampler;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebGLShader;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebGLShaderPrecisionFormat;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebGLSync;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebGLTexture;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebGLTransformFeedback;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebGLUniformLocation;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebGLVertexArrayObject;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebGLVertexArrayObjectOES;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForAudioTrack;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForAudioTrackConfiguration;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForAudioTrackList;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDataCue;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForTextTrack;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForTextTrackCue;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForTextTrackCueGeneric;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForTextTrackCueList;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForTextTrackList;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForTrackEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForVTTCue;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForVTTRegion;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForVTTRegionList;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForVideoTrack;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForVideoTrackConfiguration;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForVideoTrackList;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCommandLineAPIHost;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForInspectorAuditAccessibilityObject;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForInspectorAuditDOMObject;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForInspectorAuditResourcesObject;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForInspectorFrontendHost;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDOMApplicationCache;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForMathMLElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForMathMLMathElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForBarProp;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForCrypto;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDOMSelection;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDOMWindow;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForEventSource;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForHistory;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForIntersectionObserver;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForIntersectionObserverEntry;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForLocation;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForNavigator;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForPerformance;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForPerformanceEntry;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForPerformanceMark;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForPerformanceMeasure;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForPerformanceNavigation;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForPerformanceNavigationTiming;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForPerformanceObserver;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForPerformanceObserverEntryList;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForPerformancePaintTiming;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForPerformanceResourceTiming;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForPerformanceServerTiming;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForPerformanceTiming;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForRemoteDOMWindow;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForResizeObserver;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForResizeObserverEntry;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForResizeObserverSize;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForScreen;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForShadowRealmGlobalScope;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForUndoItem;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForUndoManager;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForUserMessageHandler;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForUserMessageHandlersNamespace;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForVisualViewport;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebKitNamespace;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebKitPoint;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWorkerNavigator;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDOMMimeType;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDOMMimeTypeArray;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDOMPlugin;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDOMPluginArray;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForStorage;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForStorageEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGAElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGAltGlyphDefElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGAltGlyphElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGAltGlyphItemElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGAngle;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGAnimateColorElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGAnimateElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGAnimateMotionElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGAnimateTransformElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGAnimatedAngle;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGAnimatedBoolean;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGAnimatedEnumeration;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGAnimatedInteger;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGAnimatedLength;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGAnimatedLengthList;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGAnimatedNumber;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGAnimatedNumberList;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGAnimatedPreserveAspectRatio;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGAnimatedRect;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGAnimatedString;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGAnimatedTransformList;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGAnimationElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGCircleElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGClipPathElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGComponentTransferFunctionElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGCursorElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGDefsElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGDescElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGEllipseElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGFEBlendElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGFEColorMatrixElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGFEComponentTransferElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGFECompositeElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGFEConvolveMatrixElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGFEDiffuseLightingElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGFEDisplacementMapElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGFEDistantLightElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGFEDropShadowElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGFEFloodElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGFEFuncAElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGFEFuncBElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGFEFuncGElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGFEFuncRElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGFEGaussianBlurElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGFEImageElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGFEMergeElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGFEMergeNodeElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGFEMorphologyElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGFEOffsetElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGFEPointLightElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGFESpecularLightingElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGFESpotLightElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGFETileElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGFETurbulenceElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGFilterElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGFontElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGFontFaceElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGFontFaceFormatElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGFontFaceNameElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGFontFaceSrcElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGFontFaceUriElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGForeignObjectElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGGElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGGeometryElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGGlyphElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGGlyphRefElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGGradientElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGGraphicsElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGHKernElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGImageElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGLength;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGLengthList;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGLineElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGLinearGradientElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGMPathElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGMarkerElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGMaskElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGMatrix;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGMetadataElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGMissingGlyphElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGNumber;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGNumberList;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGPathElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGPathSeg;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGPathSegArcAbs;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGPathSegArcRel;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGPathSegClosePath;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGPathSegCurvetoCubicAbs;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGPathSegCurvetoCubicRel;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGPathSegCurvetoCubicSmoothAbs;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGPathSegCurvetoCubicSmoothRel;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGPathSegCurvetoQuadraticAbs;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGPathSegCurvetoQuadraticRel;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGPathSegCurvetoQuadraticSmoothAbs;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGPathSegCurvetoQuadraticSmoothRel;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGPathSegLinetoAbs;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGPathSegLinetoHorizontalAbs;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGPathSegLinetoHorizontalRel;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGPathSegLinetoRel;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGPathSegLinetoVerticalAbs;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGPathSegLinetoVerticalRel;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGPathSegList;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGPathSegMovetoAbs;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGPathSegMovetoRel;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGPatternElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGPoint;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGPointList;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGPolygonElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGPolylineElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGPreserveAspectRatio;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGRadialGradientElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGRect;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGRectElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGRenderingIntent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGSVGElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGScriptElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGSetElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGStopElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGStringList;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGStyleElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGSwitchElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGSymbolElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGTRefElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGTSpanElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGTextContentElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGTextElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGTextPathElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGTextPositioningElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGTitleElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGTransform;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGTransformList;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGUnitTypes;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGUseElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGVKernElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGViewElement;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGViewSpec;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSVGZoomEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForGCObservation;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForInternalSettings;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForInternals;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForInternalsMapLike;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForInternalsSetLike;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForMallocStatistics;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForMemoryInfo;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForMockCDMFactory;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForMockContentFilterSettings;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForMockPageOverlay;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForMockPaymentCoordinator;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForServiceWorkerInternals;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForTypeConversions;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebFakeXRDevice;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebFakeXRInputController;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWebXRTest;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDedicatedWorkerGlobalScope;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWorker;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWorkerGlobalScope;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWorkerLocation;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForExtendableEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForExtendableMessageEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForFetchEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForNavigationPreloadManager;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForServiceWorker;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForServiceWorkerClient;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForServiceWorkerClients;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForServiceWorkerContainer;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForServiceWorkerGlobalScope;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForServiceWorkerRegistration;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForServiceWorkerWindowClient;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSharedWorker;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForSharedWorkerGlobalScope;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForPaintWorkletGlobalScope;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWorklet;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForWorkletGlobalScope;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForDOMParser;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForXMLHttpRequest;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForXMLHttpRequestEventTarget;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForXMLHttpRequestProgressEvent;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForXMLHttpRequestUpload;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForXMLSerializer;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForXPathEvaluator;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForXPathExpression;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForXPathNSResolver;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForXPathResult;
+    // std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForXSLTProcessor;
+};
+} // namespace WebCore
diff --git a/src/javascript/jsc/bindings/webcore/DOMConstructors.h b/src/javascript/jsc/bindings/webcore/DOMConstructors.h
new file mode 100644
index 000000000..3d6833e7a
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/DOMConstructors.h
@@ -0,0 +1,864 @@
+#include "JavaScriptCore/JSCInlines.h"
+#include "wtf/FastMalloc.h"
+#include "wtf/Noncopyable.h"
+
+#pragma once
+
+namespace WebCore {
+
+enum class DOMConstructorID : uint16_t {
+    Touch,
+    TouchEvent,
+    TouchList,
+    InternalSettingsGenerated,
+    GPU,
+    GPUAdapter,
+    GPUBindGroup,
+    GPUBindGroupLayout,
+    GPUBuffer,
+    GPUBufferUsage,
+    GPUCanvasContext,
+    GPUColorWrite,
+    GPUCommandBuffer,
+    GPUCommandEncoder,
+    GPUCompilationInfo,
+    GPUCompilationMessage,
+    GPUComputePassEncoder,
+    GPUComputePipeline,
+    GPUDevice,
+    GPUDeviceLostInfo,
+    GPUExternalTexture,
+    GPUMapMode,
+    GPUOutOfMemoryError,
+    GPUPipelineLayout,
+    GPUQuerySet,
+    GPUQueue,
+    GPURenderBundle,
+    GPURenderBundleEncoder,
+    GPURenderPassEncoder,
+    GPURenderPipeline,
+    GPUSampler,
+    GPUShaderModule,
+    GPUShaderStage,
+    GPUSupportedFeatures,
+    GPUSupportedLimits,
+    GPUTexture,
+    GPUTextureUsage,
+    GPUTextureView,
+    GPUUncapturedErrorEvent,
+    GPUValidationError,
+    WebKitPlaybackTargetAvailabilityEvent,
+    ApplePayCancelEvent,
+    ApplePayCouponCodeChangedEvent,
+    ApplePayError,
+    ApplePayPaymentAuthorizedEvent,
+    ApplePayPaymentMethodSelectedEvent,
+    ApplePaySession,
+    ApplePaySetup,
+    ApplePaySetupFeature,
+    ApplePayShippingContactSelectedEvent,
+    ApplePayShippingMethodSelectedEvent,
+    ApplePayValidateMerchantEvent,
+    Clipboard,
+    ClipboardItem,
+    DOMCache,
+    DOMCacheStorage,
+    ContactsManager,
+    BasicCredential,
+    CredentialsContainer,
+    MediaKeyMessageEvent,
+    MediaKeySession,
+    MediaKeyStatusMap,
+    MediaKeySystemAccess,
+    MediaKeys,
+    WebKitMediaKeyMessageEvent,
+    WebKitMediaKeyNeededEvent,
+    WebKitMediaKeySession,
+    WebKitMediaKeys,
+    DOMFileSystem,
+    FileSystemDirectoryEntry,
+    FileSystemDirectoryReader,
+    FileSystemEntry,
+    FileSystemFileEntry,
+    FetchHeaders,
+    FetchRequest,
+    FetchResponse,
+    FileSystemDirectoryHandle,
+    FileSystemFileHandle,
+    FileSystemHandle,
+    FileSystemSyncAccessHandle,
+    Gamepad,
+    GamepadButton,
+    GamepadEvent,
+    Geolocation,
+    GeolocationCoordinates,
+    GeolocationPosition,
+    GeolocationPositionError,
+    Highlight,
+    HighlightRegister,
+    IDBCursor,
+    IDBCursorWithValue,
+    IDBDatabase,
+    IDBFactory,
+    IDBIndex,
+    IDBKeyRange,
+    IDBObjectStore,
+    IDBOpenDBRequest,
+    IDBRequest,
+    IDBTransaction,
+    IDBVersionChangeEvent,
+    MediaCapabilities,
+    MediaControlsHost,
+    BlobEvent,
+    MediaRecorder,
+    MediaRecorderErrorEvent,
+    MediaMetadata,
+    MediaSession,
+    MediaSessionCoordinator,
+    MediaSource,
+    SourceBuffer,
+    SourceBufferList,
+    VideoPlaybackQuality,
+    CanvasCaptureMediaStreamTrack,
+    MediaDeviceInfo,
+    MediaDevices,
+    MediaStream,
+    MediaStreamTrack,
+    MediaStreamTrackEvent,
+    OverconstrainedError,
+    OverconstrainedErrorEvent,
+    RTCCertificate,
+    RTCDTMFSender,
+    RTCDTMFToneChangeEvent,
+    RTCDataChannel,
+    RTCDataChannelEvent,
+    RTCDtlsTransport,
+    RTCEncodedAudioFrame,
+    RTCEncodedVideoFrame,
+    RTCError,
+    RTCErrorEvent,
+    RTCIceCandidate,
+    RTCIceTransport,
+    RTCPeerConnection,
+    RTCPeerConnectionIceErrorEvent,
+    RTCPeerConnectionIceEvent,
+    RTCRtpReceiver,
+    RTCRtpSFrameTransform,
+    RTCRtpSFrameTransformErrorEvent,
+    RTCRtpScriptTransform,
+    RTCRtpScriptTransformer,
+    RTCRtpSender,
+    RTCRtpTransceiver,
+    RTCSctpTransport,
+    RTCSessionDescription,
+    RTCStatsReport,
+    RTCTrackEvent,
+    RTCTransformEvent,
+    HTMLModelElement,
+    Notification,
+    NotificationEvent,
+    MerchantValidationEvent,
+    PaymentAddress,
+    PaymentMethodChangeEvent,
+    PaymentRequest,
+    PaymentRequestUpdateEvent,
+    PaymentResponse,
+    PermissionStatus,
+    Permissions,
+    PictureInPictureEvent,
+    PictureInPictureWindow,
+    PushEvent,
+    PushManager,
+    PushMessageData,
+    PushSubscription,
+    PushSubscriptionChangeEvent,
+    PushSubscriptionOptions,
+    RemotePlayback,
+    SpeechRecognition,
+    SpeechRecognitionAlternative,
+    SpeechRecognitionErrorEvent,
+    SpeechRecognitionEvent,
+    SpeechRecognitionResult,
+    SpeechRecognitionResultList,
+    SpeechSynthesis,
+    SpeechSynthesisErrorEvent,
+    SpeechSynthesisEvent,
+    SpeechSynthesisUtterance,
+    SpeechSynthesisVoice,
+    StorageManager,
+    ByteLengthQueuingStrategy,
+    CountQueuingStrategy,
+    ReadableByteStreamController,
+    ReadableStream,
+    ReadableStreamBYOBReader,
+    ReadableStreamBYOBRequest,
+    ReadableStreamDefaultController,
+    ReadableStreamDefaultReader,
+    ReadableStreamSink,
+    ReadableStreamSource,
+    TransformStream,
+    TransformStreamDefaultController,
+    WritableStream,
+    WritableStreamDefaultController,
+    WritableStreamDefaultWriter,
+    WritableStreamSink,
+    WebLock,
+    WebLockManager,
+    AnalyserNode,
+    AudioBuffer,
+    AudioBufferSourceNode,
+    AudioContext,
+    AudioDestinationNode,
+    AudioListener,
+    AudioNode,
+    AudioParam,
+    AudioParamMap,
+    AudioProcessingEvent,
+    AudioScheduledSourceNode,
+    AudioWorklet,
+    AudioWorkletGlobalScope,
+    AudioWorkletNode,
+    AudioWorkletProcessor,
+    BaseAudioContext,
+    BiquadFilterNode,
+    ChannelMergerNode,
+    ChannelSplitterNode,
+    ConstantSourceNode,
+    ConvolverNode,
+    DelayNode,
+    DynamicsCompressorNode,
+    GainNode,
+    IIRFilterNode,
+    MediaElementAudioSourceNode,
+    MediaStreamAudioDestinationNode,
+    MediaStreamAudioSourceNode,
+    OfflineAudioCompletionEvent,
+    OfflineAudioContext,
+    OscillatorNode,
+    PannerNode,
+    PeriodicWave,
+    ScriptProcessorNode,
+    StereoPannerNode,
+    WaveShaperNode,
+    AuthenticatorAssertionResponse,
+    AuthenticatorAttestationResponse,
+    AuthenticatorResponse,
+    PublicKeyCredential,
+    VideoColorSpace,
+    Database,
+    SQLError,
+    SQLResultSet,
+    SQLResultSetRowList,
+    SQLTransaction,
+    CloseEvent,
+    WebSocket,
+    WebXRBoundedReferenceSpace,
+    WebXRFrame,
+    WebXRHand,
+    WebXRInputSource,
+    WebXRInputSourceArray,
+    WebXRJointPose,
+    WebXRJointSpace,
+    WebXRLayer,
+    WebXRPose,
+    WebXRReferenceSpace,
+    WebXRRenderState,
+    WebXRRigidTransform,
+    WebXRSession,
+    WebXRSpace,
+    WebXRSystem,
+    WebXRView,
+    WebXRViewerPose,
+    WebXRViewport,
+    WebXRWebGLLayer,
+    XRInputSourceEvent,
+    XRInputSourcesChangeEvent,
+    XRReferenceSpaceEvent,
+    XRSessionEvent,
+    AnimationEffect,
+    AnimationPlaybackEvent,
+    AnimationTimeline,
+    CSSAnimation,
+    CSSTransition,
+    CustomEffect,
+    DocumentTimeline,
+    KeyframeEffect,
+    WebAnimation,
+    CryptoKey,
+    SubtleCrypto,
+    CSSConditionRule,
+    CSSCounterStyleRule,
+    CSSFontFaceRule,
+    CSSFontPaletteValuesRule,
+    CSSGroupingRule,
+    CSSImportRule,
+    CSSKeyframeRule,
+    CSSKeyframesRule,
+    CSSLayerBlockRule,
+    CSSLayerStatementRule,
+    CSSMediaRule,
+    CSSNamespaceRule,
+    CSSPageRule,
+    CSSPaintSize,
+    CSSRule,
+    CSSRuleList,
+    CSSStyleDeclaration,
+    CSSStyleRule,
+    CSSStyleSheet,
+    CSSSupportsRule,
+    CSSUnknownRule,
+    DOMCSSNamespace,
+    DOMMatrix,
+    DOMMatrixReadOnly,
+    DeprecatedCSSOMCounter,
+    DeprecatedCSSOMPrimitiveValue,
+    DeprecatedCSSOMRGBColor,
+    DeprecatedCSSOMRect,
+    DeprecatedCSSOMValue,
+    DeprecatedCSSOMValueList,
+    FontFace,
+    FontFaceSet,
+    MediaList,
+    MediaQueryList,
+    MediaQueryListEvent,
+    StyleMedia,
+    StyleSheet,
+    StyleSheetList,
+    CSSKeywordValue,
+    CSSNumericValue,
+    CSSOMVariableReferenceValue,
+    CSSStyleImageValue,
+    CSSStyleValue,
+    CSSUnitValue,
+    CSSUnparsedValue,
+    StylePropertyMap,
+    StylePropertyMapReadOnly,
+    CSSMathInvert,
+    CSSMathMax,
+    CSSMathMin,
+    CSSMathNegate,
+    CSSMathProduct,
+    CSSMathSum,
+    CSSMathValue,
+    CSSNumericArray,
+    CSSMatrixComponent,
+    CSSPerspective,
+    CSSRotate,
+    CSSScale,
+    CSSSkew,
+    CSSSkewX,
+    CSSSkewY,
+    CSSTransformComponent,
+    CSSTransformValue,
+    CSSTranslate,
+    AbortController,
+    AbortSignal,
+    AbstractRange,
+    AnimationEvent,
+    Attr,
+    BeforeUnloadEvent,
+    BroadcastChannel,
+    CDATASection,
+    CharacterData,
+    ClipboardEvent,
+    Comment,
+    CompositionEvent,
+    CustomElementRegistry,
+    CustomEvent,
+    DOMException,
+    DOMImplementation,
+    DOMPoint,
+    DOMPointReadOnly,
+    DOMQuad,
+    DOMRect,
+    DOMRectList,
+    DOMRectReadOnly,
+    DOMStringList,
+    DOMStringMap,
+    DataTransfer,
+    DataTransferItem,
+    DataTransferItemList,
+    DeviceMotionEvent,
+    DeviceOrientationEvent,
+    Document,
+    DocumentFragment,
+    DocumentType,
+    DragEvent,
+    Element,
+    ErrorEvent,
+    Event,
+    EventListener,
+    EventTarget,
+    FocusEvent,
+    FormDataEvent,
+    HashChangeEvent,
+    IdleDeadline,
+    InputEvent,
+    KeyboardEvent,
+    MessageChannel,
+    MessageEvent,
+    MessagePort,
+    MouseEvent,
+    MutationEvent,
+    MutationObserver,
+    MutationRecord,
+    NamedNodeMap,
+    Node,
+    NodeFilter,
+    NodeIterator,
+    NodeList,
+    OverflowEvent,
+    PageTransitionEvent,
+    PointerEvent,
+    PopStateEvent,
+    ProcessingInstruction,
+    ProgressEvent,
+    PromiseRejectionEvent,
+    Range,
+    SecurityPolicyViolationEvent,
+    ShadowRoot,
+    StaticRange,
+    Text,
+    TextDecoder,
+    TextDecoderStream,
+    TextDecoderStreamDecoder,
+    TextEncoder,
+    TextEncoderStream,
+    TextEncoderStreamEncoder,
+    TextEvent,
+    TransitionEvent,
+    TreeWalker,
+    UIEvent,
+    WheelEvent,
+    XMLDocument,
+    Blob,
+    File,
+    FileList,
+    FileReader,
+    FileReaderSync,
+    DOMFormData,
+    DOMTokenList,
+    DOMURL,
+    HTMLAllCollection,
+    HTMLAnchorElement,
+    HTMLAreaElement,
+    HTMLAttachmentElement,
+    HTMLAudioElement,
+    HTMLAudioElementLegacyFactory,
+    HTMLBRElement,
+    HTMLBaseElement,
+    HTMLBodyElement,
+    HTMLButtonElement,
+    HTMLCanvasElement,
+    HTMLCollection,
+    HTMLDListElement,
+    HTMLDataElement,
+    HTMLDataListElement,
+    HTMLDetailsElement,
+    HTMLDialogElement,
+    HTMLDirectoryElement,
+    HTMLDivElement,
+    HTMLDocument,
+    HTMLElement,
+    HTMLEmbedElement,
+    HTMLFieldSetElement,
+    HTMLFontElement,
+    HTMLFormControlsCollection,
+    HTMLFormElement,
+    HTMLFrameElement,
+    HTMLFrameSetElement,
+    HTMLHRElement,
+    HTMLHeadElement,
+    HTMLHeadingElement,
+    HTMLHtmlElement,
+    HTMLIFrameElement,
+    HTMLImageElement,
+    HTMLImageElementLegacyFactory,
+    HTMLInputElement,
+    HTMLLIElement,
+    HTMLLabelElement,
+    HTMLLegendElement,
+    HTMLLinkElement,
+    HTMLMapElement,
+    HTMLMarqueeElement,
+    HTMLMediaElement,
+    HTMLMenuElement,
+    HTMLMenuItemElement,
+    HTMLMetaElement,
+    HTMLMeterElement,
+    HTMLModElement,
+    HTMLOListElement,
+    HTMLObjectElement,
+    HTMLOptGroupElement,
+    HTMLOptionElement,
+    HTMLOptionElementLegacyFactory,
+    HTMLOptionsCollection,
+    HTMLOutputElement,
+    HTMLParagraphElement,
+    HTMLParamElement,
+    HTMLPictureElement,
+    HTMLPreElement,
+    HTMLProgressElement,
+    HTMLQuoteElement,
+    HTMLScriptElement,
+    HTMLSelectElement,
+    HTMLSlotElement,
+    HTMLSourceElement,
+    HTMLSpanElement,
+    HTMLStyleElement,
+    HTMLTableCaptionElement,
+    HTMLTableCellElement,
+    HTMLTableColElement,
+    HTMLTableElement,
+    HTMLTableRowElement,
+    HTMLTableSectionElement,
+    HTMLTemplateElement,
+    HTMLTextAreaElement,
+    HTMLTimeElement,
+    HTMLTitleElement,
+    HTMLTrackElement,
+    HTMLUListElement,
+    HTMLUnknownElement,
+    HTMLVideoElement,
+    ImageBitmap,
+    ImageData,
+    MediaController,
+    MediaEncryptedEvent,
+    MediaError,
+    OffscreenCanvas,
+    RadioNodeList,
+    SubmitEvent,
+    TextMetrics,
+    TimeRanges,
+    URLSearchParams,
+    ValidityState,
+    WebKitMediaKeyError,
+    ANGLEInstancedArrays,
+    CanvasGradient,
+    CanvasPattern,
+    CanvasRenderingContext2D,
+    EXTBlendMinMax,
+    EXTColorBufferFloat,
+    EXTColorBufferHalfFloat,
+    EXTFloatBlend,
+    EXTFragDepth,
+    EXTShaderTextureLOD,
+    EXTTextureCompressionRGTC,
+    EXTTextureFilterAnisotropic,
+    EXTsRGB,
+    ImageBitmapRenderingContext,
+    KHRParallelShaderCompile,
+    OESElementIndexUint,
+    OESFBORenderMipmap,
+    OESStandardDerivatives,
+    OESTextureFloat,
+    OESTextureFloatLinear,
+    OESTextureHalfFloat,
+    OESTextureHalfFloatLinear,
+    OESVertexArrayObject,
+    OffscreenCanvasRenderingContext2D,
+    PaintRenderingContext2D,
+    Path2D,
+    WebGL2RenderingContext,
+    WebGLActiveInfo,
+    WebGLBuffer,
+    WebGLColorBufferFloat,
+    WebGLCompressedTextureASTC,
+    WebGLCompressedTextureATC,
+    WebGLCompressedTextureETC,
+    WebGLCompressedTextureETC1,
+    WebGLCompressedTexturePVRTC,
+    WebGLCompressedTextureS3TC,
+    WebGLCompressedTextureS3TCsRGB,
+    WebGLContextEvent,
+    WebGLDebugRendererInfo,
+    WebGLDebugShaders,
+    WebGLDepthTexture,
+    WebGLDrawBuffers,
+    WebGLFramebuffer,
+    WebGLLoseContext,
+    WebGLMultiDraw,
+    WebGLProgram,
+    WebGLQuery,
+    WebGLRenderbuffer,
+    WebGLRenderingContext,
+    WebGLSampler,
+    WebGLShader,
+    WebGLShaderPrecisionFormat,
+    WebGLSync,
+    WebGLTexture,
+    WebGLTransformFeedback,
+    WebGLUniformLocation,
+    WebGLVertexArrayObject,
+    WebGLVertexArrayObjectOES,
+    AudioTrack,
+    AudioTrackConfiguration,
+    AudioTrackList,
+    DataCue,
+    TextTrack,
+    TextTrackCue,
+    TextTrackCueGeneric,
+    TextTrackCueList,
+    TextTrackList,
+    TrackEvent,
+    VTTCue,
+    VTTRegion,
+    VTTRegionList,
+    VideoTrack,
+    VideoTrackConfiguration,
+    VideoTrackList,
+    CommandLineAPIHost,
+    InspectorAuditAccessibilityObject,
+    InspectorAuditDOMObject,
+    InspectorAuditResourcesObject,
+    InspectorFrontendHost,
+    DOMApplicationCache,
+    MathMLElement,
+    MathMLMathElement,
+    BarProp,
+    Crypto,
+    DOMSelection,
+    DOMWindow,
+    EventSource,
+    History,
+    IntersectionObserver,
+    IntersectionObserverEntry,
+    Location,
+    Navigator,
+    Performance,
+    PerformanceEntry,
+    PerformanceMark,
+    PerformanceMeasure,
+    PerformanceNavigation,
+    PerformanceNavigationTiming,
+    PerformanceObserver,
+    PerformanceObserverEntryList,
+    PerformancePaintTiming,
+    PerformanceResourceTiming,
+    PerformanceServerTiming,
+    PerformanceTiming,
+    RemoteDOMWindow,
+    ResizeObserver,
+    ResizeObserverEntry,
+    ResizeObserverSize,
+    Screen,
+    ShadowRealmGlobalScope,
+    UndoItem,
+    UndoManager,
+    UserMessageHandler,
+    UserMessageHandlersNamespace,
+    VisualViewport,
+    WebKitNamespace,
+    WebKitPoint,
+    WorkerNavigator,
+    DOMMimeType,
+    DOMMimeTypeArray,
+    DOMPlugin,
+    DOMPluginArray,
+    Storage,
+    StorageEvent,
+    SVGAElement,
+    SVGAltGlyphDefElement,
+    SVGAltGlyphElement,
+    SVGAltGlyphItemElement,
+    SVGAngle,
+    SVGAnimateColorElement,
+    SVGAnimateElement,
+    SVGAnimateMotionElement,
+    SVGAnimateTransformElement,
+    SVGAnimatedAngle,
+    SVGAnimatedBoolean,
+    SVGAnimatedEnumeration,
+    SVGAnimatedInteger,
+    SVGAnimatedLength,
+    SVGAnimatedLengthList,
+    SVGAnimatedNumber,
+    SVGAnimatedNumberList,
+    SVGAnimatedPreserveAspectRatio,
+    SVGAnimatedRect,
+    SVGAnimatedString,
+    SVGAnimatedTransformList,
+    SVGAnimationElement,
+    SVGCircleElement,
+    SVGClipPathElement,
+    SVGComponentTransferFunctionElement,
+    SVGCursorElement,
+    SVGDefsElement,
+    SVGDescElement,
+    SVGElement,
+    SVGEllipseElement,
+    SVGFEBlendElement,
+    SVGFEColorMatrixElement,
+    SVGFEComponentTransferElement,
+    SVGFECompositeElement,
+    SVGFEConvolveMatrixElement,
+    SVGFEDiffuseLightingElement,
+    SVGFEDisplacementMapElement,
+    SVGFEDistantLightElement,
+    SVGFEDropShadowElement,
+    SVGFEFloodElement,
+    SVGFEFuncAElement,
+    SVGFEFuncBElement,
+    SVGFEFuncGElement,
+    SVGFEFuncRElement,
+    SVGFEGaussianBlurElement,
+    SVGFEImageElement,
+    SVGFEMergeElement,
+    SVGFEMergeNodeElement,
+    SVGFEMorphologyElement,
+    SVGFEOffsetElement,
+    SVGFEPointLightElement,
+    SVGFESpecularLightingElement,
+    SVGFESpotLightElement,
+    SVGFETileElement,
+    SVGFETurbulenceElement,
+    SVGFilterElement,
+    SVGFontElement,
+    SVGFontFaceElement,
+    SVGFontFaceFormatElement,
+    SVGFontFaceNameElement,
+    SVGFontFaceSrcElement,
+    SVGFontFaceUriElement,
+    SVGForeignObjectElement,
+    SVGGElement,
+    SVGGeometryElement,
+    SVGGlyphElement,
+    SVGGlyphRefElement,
+    SVGGradientElement,
+    SVGGraphicsElement,
+    SVGHKernElement,
+    SVGImageElement,
+    SVGLength,
+    SVGLengthList,
+    SVGLineElement,
+    SVGLinearGradientElement,
+    SVGMPathElement,
+    SVGMarkerElement,
+    SVGMaskElement,
+    SVGMatrix,
+    SVGMetadataElement,
+    SVGMissingGlyphElement,
+    SVGNumber,
+    SVGNumberList,
+    SVGPathElement,
+    SVGPathSeg,
+    SVGPathSegArcAbs,
+    SVGPathSegArcRel,
+    SVGPathSegClosePath,
+    SVGPathSegCurvetoCubicAbs,
+    SVGPathSegCurvetoCubicRel,
+    SVGPathSegCurvetoCubicSmoothAbs,
+    SVGPathSegCurvetoCubicSmoothRel,
+    SVGPathSegCurvetoQuadraticAbs,
+    SVGPathSegCurvetoQuadraticRel,
+    SVGPathSegCurvetoQuadraticSmoothAbs,
+    SVGPathSegCurvetoQuadraticSmoothRel,
+    SVGPathSegLinetoAbs,
+    SVGPathSegLinetoHorizontalAbs,
+    SVGPathSegLinetoHorizontalRel,
+    SVGPathSegLinetoRel,
+    SVGPathSegLinetoVerticalAbs,
+    SVGPathSegLinetoVerticalRel,
+    SVGPathSegList,
+    SVGPathSegMovetoAbs,
+    SVGPathSegMovetoRel,
+    SVGPatternElement,
+    SVGPoint,
+    SVGPointList,
+    SVGPolygonElement,
+    SVGPolylineElement,
+    SVGPreserveAspectRatio,
+    SVGRadialGradientElement,
+    SVGRect,
+    SVGRectElement,
+    SVGRenderingIntent,
+    SVGSVGElement,
+    SVGScriptElement,
+    SVGSetElement,
+    SVGStopElement,
+    SVGStringList,
+    SVGStyleElement,
+    SVGSwitchElement,
+    SVGSymbolElement,
+    SVGTRefElement,
+    SVGTSpanElement,
+    SVGTextContentElement,
+    SVGTextElement,
+    SVGTextPathElement,
+    SVGTextPositioningElement,
+    SVGTitleElement,
+    SVGTransform,
+    SVGTransformList,
+    SVGUnitTypes,
+    SVGUseElement,
+    SVGVKernElement,
+    SVGViewElement,
+    SVGViewSpec,
+    SVGZoomEvent,
+    GCObservation,
+    InternalSettings,
+    Internals,
+    InternalsMapLike,
+    InternalsSetLike,
+    MallocStatistics,
+    MemoryInfo,
+    MockCDMFactory,
+    MockContentFilterSettings,
+    MockPageOverlay,
+    MockPaymentCoordinator,
+    ServiceWorkerInternals,
+    TypeConversions,
+    WebFakeXRDevice,
+    WebFakeXRInputController,
+    WebXRTest,
+    DedicatedWorkerGlobalScope,
+    Worker,
+    WorkerGlobalScope,
+    WorkerLocation,
+    ExtendableEvent,
+    ExtendableMessageEvent,
+    FetchEvent,
+    NavigationPreloadManager,
+    ServiceWorker,
+    ServiceWorkerClient,
+    ServiceWorkerClients,
+    ServiceWorkerContainer,
+    ServiceWorkerGlobalScope,
+    ServiceWorkerRegistration,
+    ServiceWorkerWindowClient,
+    SharedWorker,
+    SharedWorkerGlobalScope,
+    PaintWorkletGlobalScope,
+    Worklet,
+    WorkletGlobalScope,
+    CustomXPathNSResolver,
+    DOMParser,
+    XMLHttpRequest,
+    XMLHttpRequestEventTarget,
+    XMLHttpRequestProgressEvent,
+    XMLHttpRequestUpload,
+    XMLSerializer,
+    XPathEvaluator,
+    XPathExpression,
+    XPathNSResolver,
+    XPathResult,
+    XSLTProcessor,
+};
+
+static constexpr unsigned numberOfDOMConstructors = 836;
+
+class DOMConstructors {
+    WTF_MAKE_NONCOPYABLE(DOMConstructors);
+    WTF_MAKE_FAST_ALLOCATED(DOMConstructors);
+
+public:
+    using ConstructorArray = std::array<JSC::WriteBarrier<JSC::JSObject>, numberOfDOMConstructors>;
+    DOMConstructors() = default;
+    ConstructorArray& array() { return m_array; }
+    const ConstructorArray& array() const { return m_array; }
+
+private:
+    ConstructorArray m_array {};
+};
+
+} // namespace WebCore
diff --git a/src/javascript/jsc/bindings/webcore/DOMIsoSubspaces.h b/src/javascript/jsc/bindings/webcore/DOMIsoSubspaces.h
new file mode 100644
index 000000000..dd1a665a4
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/DOMIsoSubspaces.h
@@ -0,0 +1,877 @@
+
+#pragma once
+
+#include "root.h"
+
+#include "wtf/FastMalloc.h"
+#include "wtf/Noncopyable.h"
+
+namespace WebCore {
+using namespace JSC;
+
+class DOMIsoSubspaces {
+    WTF_MAKE_NONCOPYABLE(DOMIsoSubspaces);
+    WTF_MAKE_FAST_ALLOCATED(DOMIsoSubspaces);
+
+public:
+    DOMIsoSubspaces() = default;
+    // std::unique_ptr<IsoSubspace> m_subspaceForTouch;
+    // std::unique_ptr<IsoSubspace> m_subspaceForTouchEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForTouchList;
+    // std::unique_ptr<IsoSubspace> m_subspaceForInternalSettingsGenerated;
+    // std::unique_ptr<IsoSubspace> m_subspaceForGPU;
+    // std::unique_ptr<IsoSubspace> m_subspaceForGPUAdapter;
+    // std::unique_ptr<IsoSubspace> m_subspaceForGPUBindGroup;
+    // std::unique_ptr<IsoSubspace> m_subspaceForGPUBindGroupLayout;
+    // std::unique_ptr<IsoSubspace> m_subspaceForGPUBuffer;
+    // std::unique_ptr<IsoSubspace> m_subspaceForGPUBufferUsage;
+    // std::unique_ptr<IsoSubspace> m_subspaceForGPUCanvasContext;
+    // std::unique_ptr<IsoSubspace> m_subspaceForGPUColorWrite;
+    // std::unique_ptr<IsoSubspace> m_subspaceForGPUCommandBuffer;
+    // std::unique_ptr<IsoSubspace> m_subspaceForGPUCommandEncoder;
+    // std::unique_ptr<IsoSubspace> m_subspaceForGPUCompilationInfo;
+    // std::unique_ptr<IsoSubspace> m_subspaceForGPUCompilationMessage;
+    // std::unique_ptr<IsoSubspace> m_subspaceForGPUComputePassEncoder;
+    // std::unique_ptr<IsoSubspace> m_subspaceForGPUComputePipeline;
+    // std::unique_ptr<IsoSubspace> m_subspaceForGPUDevice;
+    // std::unique_ptr<IsoSubspace> m_subspaceForGPUDeviceLostInfo;
+    // std::unique_ptr<IsoSubspace> m_subspaceForGPUExternalTexture;
+    // std::unique_ptr<IsoSubspace> m_subspaceForGPUMapMode;
+    // std::unique_ptr<IsoSubspace> m_subspaceForGPUOutOfMemoryError;
+    // std::unique_ptr<IsoSubspace> m_subspaceForGPUPipelineLayout;
+    // std::unique_ptr<IsoSubspace> m_subspaceForGPUQuerySet;
+    // std::unique_ptr<IsoSubspace> m_subspaceForGPUQueue;
+    // std::unique_ptr<IsoSubspace> m_subspaceForGPURenderBundle;
+    // std::unique_ptr<IsoSubspace> m_subspaceForGPURenderBundleEncoder;
+    // std::unique_ptr<IsoSubspace> m_subspaceForGPURenderPassEncoder;
+    // std::unique_ptr<IsoSubspace> m_subspaceForGPURenderPipeline;
+    // std::unique_ptr<IsoSubspace> m_subspaceForGPUSampler;
+    // std::unique_ptr<IsoSubspace> m_subspaceForGPUShaderModule;
+    // std::unique_ptr<IsoSubspace> m_subspaceForGPUShaderStage;
+    // std::unique_ptr<IsoSubspace> m_subspaceForGPUSupportedFeatures;
+    // std::unique_ptr<IsoSubspace> m_subspaceForGPUSupportedLimits;
+    // std::unique_ptr<IsoSubspace> m_subspaceForGPUTexture;
+    // std::unique_ptr<IsoSubspace> m_subspaceForGPUTextureUsage;
+    // std::unique_ptr<IsoSubspace> m_subspaceForGPUTextureView;
+    // std::unique_ptr<IsoSubspace> m_subspaceForGPUUncapturedErrorEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForGPUValidationError;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebKitPlaybackTargetAvailabilityEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForApplePayCancelEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForApplePayCouponCodeChangedEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForApplePayError;
+    // std::unique_ptr<IsoSubspace> m_subspaceForApplePayPaymentAuthorizedEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForApplePayPaymentMethodSelectedEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForApplePaySession;
+    // std::unique_ptr<IsoSubspace> m_subspaceForApplePaySetup;
+    // std::unique_ptr<IsoSubspace> m_subspaceForApplePaySetupFeature;
+    // std::unique_ptr<IsoSubspace> m_subspaceForApplePayShippingContactSelectedEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForApplePayShippingMethodSelectedEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForApplePayValidateMerchantEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForClipboard;
+    // std::unique_ptr<IsoSubspace> m_subspaceForClipboardItem;
+    // std::unique_ptr<IsoSubspace> m_subspaceForDOMCache;
+    // std::unique_ptr<IsoSubspace> m_subspaceForDOMCacheStorage;
+    // std::unique_ptr<IsoSubspace> m_subspaceForContactsManager;
+    // std::unique_ptr<IsoSubspace> m_subspaceForBasicCredential;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCredentialsContainer;
+    // std::unique_ptr<IsoSubspace> m_subspaceForMediaKeyMessageEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForMediaKeySession;
+    // std::unique_ptr<IsoSubspace> m_subspaceForMediaKeyStatusMap;
+    // std::unique_ptr<IsoSubspace> m_subspaceForMediaKeyStatusMapIterator;
+    // std::unique_ptr<IsoSubspace> m_subspaceForMediaKeySystemAccess;
+    // std::unique_ptr<IsoSubspace> m_subspaceForMediaKeys;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebKitMediaKeyMessageEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebKitMediaKeyNeededEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebKitMediaKeySession;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebKitMediaKeys;
+    // std::unique_ptr<IsoSubspace> m_subspaceForDOMFileSystem;
+    // std::unique_ptr<IsoSubspace> m_subspaceForFileSystemDirectoryEntry;
+    // std::unique_ptr<IsoSubspace> m_subspaceForFileSystemDirectoryReader;
+    // std::unique_ptr<IsoSubspace> m_subspaceForFileSystemEntry;
+    // std::unique_ptr<IsoSubspace> m_subspaceForFileSystemFileEntry;
+    // std::unique_ptr<IsoSubspace> m_subspaceForFetchHeaders;
+    // std::unique_ptr<IsoSubspace> m_subspaceForFetchHeadersIterator;
+    // std::unique_ptr<IsoSubspace> m_subspaceForFetchRequest;
+    // std::unique_ptr<IsoSubspace> m_subspaceForFetchResponse;
+    // std::unique_ptr<IsoSubspace> m_subspaceForFileSystemDirectoryHandle;
+    // std::unique_ptr<IsoSubspace> m_subspaceForFileSystemFileHandle;
+    // std::unique_ptr<IsoSubspace> m_subspaceForFileSystemHandle;
+    // std::unique_ptr<IsoSubspace> m_subspaceForFileSystemSyncAccessHandle;
+    // std::unique_ptr<IsoSubspace> m_subspaceForGamepad;
+    // std::unique_ptr<IsoSubspace> m_subspaceForGamepadButton;
+    // std::unique_ptr<IsoSubspace> m_subspaceForGamepadEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForGeolocation;
+    // std::unique_ptr<IsoSubspace> m_subspaceForGeolocationCoordinates;
+    // std::unique_ptr<IsoSubspace> m_subspaceForGeolocationPosition;
+    // std::unique_ptr<IsoSubspace> m_subspaceForGeolocationPositionError;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHighlight;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHighlightRegister;
+    // std::unique_ptr<IsoSubspace> m_subspaceForIDBCursor;
+    // std::unique_ptr<IsoSubspace> m_subspaceForIDBCursorWithValue;
+    // std::unique_ptr<IsoSubspace> m_subspaceForIDBDatabase;
+    // std::unique_ptr<IsoSubspace> m_subspaceForIDBFactory;
+    // std::unique_ptr<IsoSubspace> m_subspaceForIDBIndex;
+    // std::unique_ptr<IsoSubspace> m_subspaceForIDBKeyRange;
+    // std::unique_ptr<IsoSubspace> m_subspaceForIDBObjectStore;
+    // std::unique_ptr<IsoSubspace> m_subspaceForIDBOpenDBRequest;
+    // std::unique_ptr<IsoSubspace> m_subspaceForIDBRequest;
+    // std::unique_ptr<IsoSubspace> m_subspaceForIDBTransaction;
+    // std::unique_ptr<IsoSubspace> m_subspaceForIDBVersionChangeEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForMediaCapabilities;
+    // std::unique_ptr<IsoSubspace> m_subspaceForMediaControlsHost;
+    // std::unique_ptr<IsoSubspace> m_subspaceForBlobEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForMediaRecorder;
+    // std::unique_ptr<IsoSubspace> m_subspaceForMediaRecorderErrorEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForMediaMetadata;
+    // std::unique_ptr<IsoSubspace> m_subspaceForMediaSession;
+    // std::unique_ptr<IsoSubspace> m_subspaceForMediaSessionCoordinator;
+    // std::unique_ptr<IsoSubspace> m_subspaceForMediaSource;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSourceBuffer;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSourceBufferList;
+    // std::unique_ptr<IsoSubspace> m_subspaceForVideoPlaybackQuality;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCanvasCaptureMediaStreamTrack;
+    // std::unique_ptr<IsoSubspace> m_subspaceForMediaDeviceInfo;
+    // std::unique_ptr<IsoSubspace> m_subspaceForMediaDevices;
+    // std::unique_ptr<IsoSubspace> m_subspaceForMediaStream;
+    // std::unique_ptr<IsoSubspace> m_subspaceForMediaStreamTrack;
+    // std::unique_ptr<IsoSubspace> m_subspaceForMediaStreamTrackEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForOverconstrainedError;
+    // std::unique_ptr<IsoSubspace> m_subspaceForOverconstrainedErrorEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForRTCCertificate;
+    // std::unique_ptr<IsoSubspace> m_subspaceForRTCDTMFSender;
+    // std::unique_ptr<IsoSubspace> m_subspaceForRTCDTMFToneChangeEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForRTCDataChannel;
+    // std::unique_ptr<IsoSubspace> m_subspaceForRTCDataChannelEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForRTCDtlsTransport;
+    // std::unique_ptr<IsoSubspace> m_subspaceForRTCEncodedAudioFrame;
+    // std::unique_ptr<IsoSubspace> m_subspaceForRTCEncodedVideoFrame;
+    // std::unique_ptr<IsoSubspace> m_subspaceForRTCError;
+    // std::unique_ptr<IsoSubspace> m_subspaceForRTCErrorEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForRTCIceCandidate;
+    // std::unique_ptr<IsoSubspace> m_subspaceForRTCIceTransport;
+    // std::unique_ptr<IsoSubspace> m_subspaceForRTCPeerConnection;
+    // std::unique_ptr<IsoSubspace> m_subspaceForRTCPeerConnectionIceErrorEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForRTCPeerConnectionIceEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForRTCRtpReceiver;
+    // std::unique_ptr<IsoSubspace> m_subspaceForRTCRtpSFrameTransform;
+    // std::unique_ptr<IsoSubspace> m_subspaceForRTCRtpSFrameTransformErrorEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForRTCRtpScriptTransform;
+    // std::unique_ptr<IsoSubspace> m_subspaceForRTCRtpScriptTransformer;
+    // std::unique_ptr<IsoSubspace> m_subspaceForRTCRtpSender;
+    // std::unique_ptr<IsoSubspace> m_subspaceForRTCRtpTransceiver;
+    // std::unique_ptr<IsoSubspace> m_subspaceForRTCSctpTransport;
+    // std::unique_ptr<IsoSubspace> m_subspaceForRTCSessionDescription;
+    // std::unique_ptr<IsoSubspace> m_subspaceForRTCStatsReport;
+    // std::unique_ptr<IsoSubspace> m_subspaceForRTCTrackEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForRTCTransformEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLModelElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForNotification;
+    // std::unique_ptr<IsoSubspace> m_subspaceForNotificationEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForMerchantValidationEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForPaymentAddress;
+    // std::unique_ptr<IsoSubspace> m_subspaceForPaymentMethodChangeEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForPaymentRequest;
+    // std::unique_ptr<IsoSubspace> m_subspaceForPaymentRequestUpdateEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForPaymentResponse;
+    // std::unique_ptr<IsoSubspace> m_subspaceForPermissionStatus;
+    // std::unique_ptr<IsoSubspace> m_subspaceForPermissions;
+    // std::unique_ptr<IsoSubspace> m_subspaceForPictureInPictureEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForPictureInPictureWindow;
+    // std::unique_ptr<IsoSubspace> m_subspaceForPushEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForPushManager;
+    // std::unique_ptr<IsoSubspace> m_subspaceForPushMessageData;
+    // std::unique_ptr<IsoSubspace> m_subspaceForPushSubscription;
+    // std::unique_ptr<IsoSubspace> m_subspaceForPushSubscriptionChangeEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForPushSubscriptionOptions;
+    // std::unique_ptr<IsoSubspace> m_subspaceForRemotePlayback;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSpeechRecognition;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSpeechRecognitionAlternative;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSpeechRecognitionErrorEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSpeechRecognitionEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSpeechRecognitionResult;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSpeechRecognitionResultList;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSpeechSynthesis;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSpeechSynthesisErrorEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSpeechSynthesisEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSpeechSynthesisUtterance;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSpeechSynthesisVoice;
+    // std::unique_ptr<IsoSubspace> m_subspaceForStorageManager;
+    // std::unique_ptr<IsoSubspace> m_subspaceForByteLengthQueuingStrategy;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCountQueuingStrategy;
+    // std::unique_ptr<IsoSubspace> m_subspaceForReadableByteStreamController;
+    // std::unique_ptr<IsoSubspace> m_subspaceForReadableStream;
+    // std::unique_ptr<IsoSubspace> m_subspaceForReadableStreamBYOBReader;
+    // std::unique_ptr<IsoSubspace> m_subspaceForReadableStreamBYOBRequest;
+    // std::unique_ptr<IsoSubspace> m_subspaceForReadableStreamDefaultController;
+    // std::unique_ptr<IsoSubspace> m_subspaceForReadableStreamDefaultReader;
+    // std::unique_ptr<IsoSubspace> m_subspaceForReadableStreamSink;
+    // std::unique_ptr<IsoSubspace> m_subspaceForReadableStreamSource;
+    // std::unique_ptr<IsoSubspace> m_subspaceForTransformStream;
+    // std::unique_ptr<IsoSubspace> m_subspaceForTransformStreamDefaultController;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWritableStream;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWritableStreamDefaultController;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWritableStreamDefaultWriter;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWritableStreamSink;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebLock;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebLockManager;
+    // std::unique_ptr<IsoSubspace> m_subspaceForAnalyserNode;
+    // std::unique_ptr<IsoSubspace> m_subspaceForAudioBuffer;
+    // std::unique_ptr<IsoSubspace> m_subspaceForAudioBufferSourceNode;
+    // std::unique_ptr<IsoSubspace> m_subspaceForAudioContext;
+    // std::unique_ptr<IsoSubspace> m_subspaceForAudioDestinationNode;
+    // std::unique_ptr<IsoSubspace> m_subspaceForAudioListener;
+    // std::unique_ptr<IsoSubspace> m_subspaceForAudioNode;
+    // std::unique_ptr<IsoSubspace> m_subspaceForAudioParam;
+    // std::unique_ptr<IsoSubspace> m_subspaceForAudioParamMap;
+    // std::unique_ptr<IsoSubspace> m_subspaceForAudioProcessingEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForAudioScheduledSourceNode;
+    // std::unique_ptr<IsoSubspace> m_subspaceForAudioWorklet;
+    // std::unique_ptr<IsoSubspace> m_subspaceForAudioWorkletGlobalScope;
+    // std::unique_ptr<IsoSubspace> m_subspaceForAudioWorkletNode;
+    // std::unique_ptr<IsoSubspace> m_subspaceForAudioWorkletProcessor;
+    // std::unique_ptr<IsoSubspace> m_subspaceForBaseAudioContext;
+    // std::unique_ptr<IsoSubspace> m_subspaceForBiquadFilterNode;
+    // std::unique_ptr<IsoSubspace> m_subspaceForChannelMergerNode;
+    // std::unique_ptr<IsoSubspace> m_subspaceForChannelSplitterNode;
+    // std::unique_ptr<IsoSubspace> m_subspaceForConstantSourceNode;
+    // std::unique_ptr<IsoSubspace> m_subspaceForConvolverNode;
+    // std::unique_ptr<IsoSubspace> m_subspaceForDelayNode;
+    // std::unique_ptr<IsoSubspace> m_subspaceForDynamicsCompressorNode;
+    // std::unique_ptr<IsoSubspace> m_subspaceForGainNode;
+    // std::unique_ptr<IsoSubspace> m_subspaceForIIRFilterNode;
+    // std::unique_ptr<IsoSubspace> m_subspaceForMediaElementAudioSourceNode;
+    // std::unique_ptr<IsoSubspace> m_subspaceForMediaStreamAudioDestinationNode;
+    // std::unique_ptr<IsoSubspace> m_subspaceForMediaStreamAudioSourceNode;
+    // std::unique_ptr<IsoSubspace> m_subspaceForOfflineAudioCompletionEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForOfflineAudioContext;
+    // std::unique_ptr<IsoSubspace> m_subspaceForOscillatorNode;
+    // std::unique_ptr<IsoSubspace> m_subspaceForPannerNode;
+    // std::unique_ptr<IsoSubspace> m_subspaceForPeriodicWave;
+    // std::unique_ptr<IsoSubspace> m_subspaceForScriptProcessorNode;
+    // std::unique_ptr<IsoSubspace> m_subspaceForStereoPannerNode;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWaveShaperNode;
+    // std::unique_ptr<IsoSubspace> m_subspaceForAuthenticatorAssertionResponse;
+    // std::unique_ptr<IsoSubspace> m_subspaceForAuthenticatorAttestationResponse;
+    // std::unique_ptr<IsoSubspace> m_subspaceForAuthenticatorResponse;
+    // std::unique_ptr<IsoSubspace> m_subspaceForPublicKeyCredential;
+    // std::unique_ptr<IsoSubspace> m_subspaceForVideoColorSpace;
+    // std::unique_ptr<IsoSubspace> m_subspaceForDatabase;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSQLError;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSQLResultSet;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSQLResultSetRowList;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSQLTransaction;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCloseEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebSocket;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebXRBoundedReferenceSpace;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebXRFrame;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebXRHand;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebXRHandIterator;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebXRInputSource;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebXRInputSourceArray;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebXRInputSourceArrayIterator;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebXRJointPose;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebXRJointSpace;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebXRLayer;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebXRPose;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebXRReferenceSpace;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebXRRenderState;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebXRRigidTransform;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebXRSession;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebXRSpace;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebXRSystem;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebXRView;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebXRViewerPose;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebXRViewport;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebXRWebGLLayer;
+    // std::unique_ptr<IsoSubspace> m_subspaceForXRInputSourceEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForXRInputSourcesChangeEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForXRReferenceSpaceEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForXRSessionEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForAnimationEffect;
+    // std::unique_ptr<IsoSubspace> m_subspaceForAnimationPlaybackEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForAnimationTimeline;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCSSAnimation;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCSSTransition;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCustomEffect;
+    // std::unique_ptr<IsoSubspace> m_subspaceForDocumentTimeline;
+    // std::unique_ptr<IsoSubspace> m_subspaceForKeyframeEffect;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebAnimation;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCryptoKey;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSubtleCrypto;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCSSConditionRule;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCSSCounterStyleRule;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCSSFontFaceRule;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCSSFontPaletteValuesRule;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCSSGroupingRule;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCSSImportRule;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCSSKeyframeRule;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCSSKeyframesRule;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCSSLayerBlockRule;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCSSLayerStatementRule;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCSSMediaRule;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCSSNamespaceRule;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCSSPageRule;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCSSPaintSize;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCSSRule;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCSSRuleList;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCSSStyleDeclaration;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCSSStyleRule;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCSSStyleSheet;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCSSSupportsRule;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCSSUnknownRule;
+    // std::unique_ptr<IsoSubspace> m_subspaceForDOMCSSNamespace;
+    // std::unique_ptr<IsoSubspace> m_subspaceForDOMMatrix;
+    // std::unique_ptr<IsoSubspace> m_subspaceForDOMMatrixReadOnly;
+    // std::unique_ptr<IsoSubspace> m_subspaceForDeprecatedCSSOMCounter;
+    // std::unique_ptr<IsoSubspace> m_subspaceForDeprecatedCSSOMPrimitiveValue;
+    // std::unique_ptr<IsoSubspace> m_subspaceForDeprecatedCSSOMRGBColor;
+    // std::unique_ptr<IsoSubspace> m_subspaceForDeprecatedCSSOMRect;
+    // std::unique_ptr<IsoSubspace> m_subspaceForDeprecatedCSSOMValue;
+    // std::unique_ptr<IsoSubspace> m_subspaceForDeprecatedCSSOMValueList;
+    // std::unique_ptr<IsoSubspace> m_subspaceForFontFace;
+    // std::unique_ptr<IsoSubspace> m_subspaceForFontFaceSet;
+    // std::unique_ptr<IsoSubspace> m_subspaceForFontFaceSetIterator;
+    // std::unique_ptr<IsoSubspace> m_subspaceForMediaList;
+    // std::unique_ptr<IsoSubspace> m_subspaceForMediaQueryList;
+    // std::unique_ptr<IsoSubspace> m_subspaceForMediaQueryListEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForStyleMedia;
+    // std::unique_ptr<IsoSubspace> m_subspaceForStyleSheet;
+    // std::unique_ptr<IsoSubspace> m_subspaceForStyleSheetList;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCSSKeywordValue;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCSSNumericValue;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCSSOMVariableReferenceValue;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCSSStyleImageValue;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCSSStyleValue;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCSSUnitValue;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCSSUnparsedValue;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCSSUnparsedValueIterator;
+    // std::unique_ptr<IsoSubspace> m_subspaceForStylePropertyMap;
+    // std::unique_ptr<IsoSubspace> m_subspaceForStylePropertyMapReadOnly;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCSSMathInvert;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCSSMathMax;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCSSMathMin;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCSSMathNegate;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCSSMathProduct;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCSSMathSum;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCSSMathValue;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCSSNumericArray;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCSSNumericArrayIterator;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCSSMatrixComponent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCSSPerspective;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCSSRotate;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCSSScale;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCSSSkew;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCSSSkewX;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCSSSkewY;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCSSTransformComponent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCSSTransformValue;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCSSTransformValueIterator;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCSSTranslate;
+    // std::unique_ptr<IsoSubspace> m_subspaceForAbortController;
+    // std::unique_ptr<IsoSubspace> m_subspaceForAbortSignal;
+    // std::unique_ptr<IsoSubspace> m_subspaceForAbstractRange;
+    // std::unique_ptr<IsoSubspace> m_subspaceForAnimationEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForAttr;
+    // std::unique_ptr<IsoSubspace> m_subspaceForBeforeUnloadEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForBroadcastChannel;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCDATASection;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCharacterData;
+    // std::unique_ptr<IsoSubspace> m_subspaceForClipboardEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForComment;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCompositionEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCustomElementRegistry;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCustomEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForDOMException;
+    // std::unique_ptr<IsoSubspace> m_subspaceForDOMImplementation;
+    // std::unique_ptr<IsoSubspace> m_subspaceForDOMPoint;
+    // std::unique_ptr<IsoSubspace> m_subspaceForDOMPointReadOnly;
+    // std::unique_ptr<IsoSubspace> m_subspaceForDOMQuad;
+    // std::unique_ptr<IsoSubspace> m_subspaceForDOMRect;
+    // std::unique_ptr<IsoSubspace> m_subspaceForDOMRectList;
+    // std::unique_ptr<IsoSubspace> m_subspaceForDOMRectReadOnly;
+    // std::unique_ptr<IsoSubspace> m_subspaceForDOMStringList;
+    // std::unique_ptr<IsoSubspace> m_subspaceForDOMStringMap;
+    // std::unique_ptr<IsoSubspace> m_subspaceForDataTransfer;
+    // std::unique_ptr<IsoSubspace> m_subspaceForDataTransferItem;
+    // std::unique_ptr<IsoSubspace> m_subspaceForDataTransferItemList;
+    // std::unique_ptr<IsoSubspace> m_subspaceForDeviceMotionEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForDeviceOrientationEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForDocument;
+    // std::unique_ptr<IsoSubspace> m_subspaceForDocumentFragment;
+    // std::unique_ptr<IsoSubspace> m_subspaceForDocumentType;
+    // std::unique_ptr<IsoSubspace> m_subspaceForDragEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForErrorEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForEventListener;
+    // std::unique_ptr<IsoSubspace> m_subspaceForEventTarget;
+    // std::unique_ptr<IsoSubspace> m_subspaceForFocusEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForFormDataEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHashChangeEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForIdleDeadline;
+    // std::unique_ptr<IsoSubspace> m_subspaceForInputEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForKeyboardEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForMessageChannel;
+    // std::unique_ptr<IsoSubspace> m_subspaceForMessageEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForMessagePort;
+    // std::unique_ptr<IsoSubspace> m_subspaceForMouseEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForMutationEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForMutationObserver;
+    // std::unique_ptr<IsoSubspace> m_subspaceForMutationRecord;
+    // std::unique_ptr<IsoSubspace> m_subspaceForNamedNodeMap;
+    // std::unique_ptr<IsoSubspace> m_subspaceForNode;
+    // std::unique_ptr<IsoSubspace> m_subspaceForNodeIterator;
+    // std::unique_ptr<IsoSubspace> m_subspaceForNodeList;
+    // std::unique_ptr<IsoSubspace> m_subspaceForNodeListIterator;
+    // std::unique_ptr<IsoSubspace> m_subspaceForOverflowEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForPageTransitionEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForPointerEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForPopStateEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForProcessingInstruction;
+    // std::unique_ptr<IsoSubspace> m_subspaceForProgressEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForPromiseRejectionEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForRange;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSecurityPolicyViolationEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForShadowRoot;
+    // std::unique_ptr<IsoSubspace> m_subspaceForStaticRange;
+    // std::unique_ptr<IsoSubspace> m_subspaceForText;
+    // std::unique_ptr<IsoSubspace> m_subspaceForTextDecoder;
+    // std::unique_ptr<IsoSubspace> m_subspaceForTextDecoderStream;
+    // std::unique_ptr<IsoSubspace> m_subspaceForTextDecoderStreamDecoder;
+    // std::unique_ptr<IsoSubspace> m_subspaceForTextEncoder;
+    // std::unique_ptr<IsoSubspace> m_subspaceForTextEncoderStream;
+    // std::unique_ptr<IsoSubspace> m_subspaceForTextEncoderStreamEncoder;
+    // std::unique_ptr<IsoSubspace> m_subspaceForTextEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForTransitionEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForTreeWalker;
+    // std::unique_ptr<IsoSubspace> m_subspaceForUIEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWheelEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForXMLDocument;
+    // std::unique_ptr<IsoSubspace> m_subspaceForBlob;
+    // std::unique_ptr<IsoSubspace> m_subspaceForFile;
+    // std::unique_ptr<IsoSubspace> m_subspaceForFileList;
+    // std::unique_ptr<IsoSubspace> m_subspaceForFileReader;
+    // std::unique_ptr<IsoSubspace> m_subspaceForFileReaderSync;
+    // std::unique_ptr<IsoSubspace> m_subspaceForDOMFormData;
+    // std::unique_ptr<IsoSubspace> m_subspaceForDOMFormDataIterator;
+    // std::unique_ptr<IsoSubspace> m_subspaceForDOMTokenList;
+    // std::unique_ptr<IsoSubspace> m_subspaceForDOMTokenListIterator;
+    // std::unique_ptr<IsoSubspace> m_subspaceForDOMURL;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLAllCollection;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLAnchorElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLAreaElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLAttachmentElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLAudioElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLBRElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLBaseElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLBodyElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLButtonElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLCanvasElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLCollection;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLDListElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLDataElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLDataListElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLDetailsElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLDialogElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLDirectoryElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLDivElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLDocument;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLEmbedElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLFieldSetElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLFontElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLFormControlsCollection;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLFormElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLFrameElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLFrameSetElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLHRElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLHeadElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLHeadingElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLHtmlElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLIFrameElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLImageElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLInputElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLLIElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLLabelElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLLegendElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLLinkElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLMapElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLMarqueeElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLMediaElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLMenuElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLMenuItemElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLMetaElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLMeterElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLModElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLOListElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLObjectElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLOptGroupElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLOptionElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLOptionsCollection;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLOutputElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLParagraphElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLParamElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLPictureElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLPreElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLProgressElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLQuoteElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLScriptElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLSelectElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLSlotElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLSourceElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLSpanElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLStyleElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLTableCaptionElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLTableCellElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLTableColElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLTableElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLTableRowElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLTableSectionElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLTemplateElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLTextAreaElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLTimeElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLTitleElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLTrackElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLUListElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLUnknownElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHTMLVideoElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForImageBitmap;
+    // std::unique_ptr<IsoSubspace> m_subspaceForImageData;
+    // std::unique_ptr<IsoSubspace> m_subspaceForMediaController;
+    // std::unique_ptr<IsoSubspace> m_subspaceForMediaEncryptedEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForMediaError;
+    // std::unique_ptr<IsoSubspace> m_subspaceForOffscreenCanvas;
+    // std::unique_ptr<IsoSubspace> m_subspaceForRadioNodeList;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSubmitEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForTextMetrics;
+    // std::unique_ptr<IsoSubspace> m_subspaceForTimeRanges;
+    // std::unique_ptr<IsoSubspace> m_subspaceForURLSearchParams;
+    // std::unique_ptr<IsoSubspace> m_subspaceForURLSearchParamsIterator;
+    // std::unique_ptr<IsoSubspace> m_subspaceForValidityState;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebKitMediaKeyError;
+    // std::unique_ptr<IsoSubspace> m_subspaceForANGLEInstancedArrays;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCanvasGradient;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCanvasPattern;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCanvasRenderingContext2D;
+    // std::unique_ptr<IsoSubspace> m_subspaceForEXTBlendMinMax;
+    // std::unique_ptr<IsoSubspace> m_subspaceForEXTColorBufferFloat;
+    // std::unique_ptr<IsoSubspace> m_subspaceForEXTColorBufferHalfFloat;
+    // std::unique_ptr<IsoSubspace> m_subspaceForEXTFloatBlend;
+    // std::unique_ptr<IsoSubspace> m_subspaceForEXTFragDepth;
+    // std::unique_ptr<IsoSubspace> m_subspaceForEXTShaderTextureLOD;
+    // std::unique_ptr<IsoSubspace> m_subspaceForEXTTextureCompressionRGTC;
+    // std::unique_ptr<IsoSubspace> m_subspaceForEXTTextureFilterAnisotropic;
+    // std::unique_ptr<IsoSubspace> m_subspaceForEXTsRGB;
+    // std::unique_ptr<IsoSubspace> m_subspaceForImageBitmapRenderingContext;
+    // std::unique_ptr<IsoSubspace> m_subspaceForKHRParallelShaderCompile;
+    // std::unique_ptr<IsoSubspace> m_subspaceForOESElementIndexUint;
+    // std::unique_ptr<IsoSubspace> m_subspaceForOESFBORenderMipmap;
+    // std::unique_ptr<IsoSubspace> m_subspaceForOESStandardDerivatives;
+    // std::unique_ptr<IsoSubspace> m_subspaceForOESTextureFloat;
+    // std::unique_ptr<IsoSubspace> m_subspaceForOESTextureFloatLinear;
+    // std::unique_ptr<IsoSubspace> m_subspaceForOESTextureHalfFloat;
+    // std::unique_ptr<IsoSubspace> m_subspaceForOESTextureHalfFloatLinear;
+    // std::unique_ptr<IsoSubspace> m_subspaceForOESVertexArrayObject;
+    // std::unique_ptr<IsoSubspace> m_subspaceForOffscreenCanvasRenderingContext2D;
+    // std::unique_ptr<IsoSubspace> m_subspaceForPaintRenderingContext2D;
+    // std::unique_ptr<IsoSubspace> m_subspaceForPath2D;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebGL2RenderingContext;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebGLActiveInfo;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebGLBuffer;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebGLColorBufferFloat;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebGLCompressedTextureASTC;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebGLCompressedTextureATC;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebGLCompressedTextureETC;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebGLCompressedTextureETC1;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebGLCompressedTexturePVRTC;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebGLCompressedTextureS3TC;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebGLCompressedTextureS3TCsRGB;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebGLContextEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebGLDebugRendererInfo;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebGLDebugShaders;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebGLDepthTexture;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebGLDrawBuffers;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebGLFramebuffer;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebGLLoseContext;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebGLMultiDraw;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebGLProgram;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebGLQuery;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebGLRenderbuffer;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebGLRenderingContext;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebGLSampler;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebGLShader;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebGLShaderPrecisionFormat;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebGLSync;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebGLTexture;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebGLTransformFeedback;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebGLUniformLocation;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebGLVertexArrayObject;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebGLVertexArrayObjectOES;
+    // std::unique_ptr<IsoSubspace> m_subspaceForAudioTrack;
+    // std::unique_ptr<IsoSubspace> m_subspaceForAudioTrackConfiguration;
+    // std::unique_ptr<IsoSubspace> m_subspaceForAudioTrackList;
+    // std::unique_ptr<IsoSubspace> m_subspaceForDataCue;
+    // std::unique_ptr<IsoSubspace> m_subspaceForTextTrack;
+    // std::unique_ptr<IsoSubspace> m_subspaceForTextTrackCue;
+    // std::unique_ptr<IsoSubspace> m_subspaceForTextTrackCueGeneric;
+    // std::unique_ptr<IsoSubspace> m_subspaceForTextTrackCueList;
+    // std::unique_ptr<IsoSubspace> m_subspaceForTextTrackList;
+    // std::unique_ptr<IsoSubspace> m_subspaceForTrackEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForVTTCue;
+    // std::unique_ptr<IsoSubspace> m_subspaceForVTTRegion;
+    // std::unique_ptr<IsoSubspace> m_subspaceForVTTRegionList;
+    // std::unique_ptr<IsoSubspace> m_subspaceForVideoTrack;
+    // std::unique_ptr<IsoSubspace> m_subspaceForVideoTrackConfiguration;
+    // std::unique_ptr<IsoSubspace> m_subspaceForVideoTrackList;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCommandLineAPIHost;
+    // std::unique_ptr<IsoSubspace> m_subspaceForInspectorAuditAccessibilityObject;
+    // std::unique_ptr<IsoSubspace> m_subspaceForInspectorAuditDOMObject;
+    // std::unique_ptr<IsoSubspace> m_subspaceForInspectorAuditResourcesObject;
+    // std::unique_ptr<IsoSubspace> m_subspaceForInspectorFrontendHost;
+    // std::unique_ptr<IsoSubspace> m_subspaceForDOMApplicationCache;
+    // std::unique_ptr<IsoSubspace> m_subspaceForMathMLElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForMathMLMathElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForBarProp;
+    // std::unique_ptr<IsoSubspace> m_subspaceForCrypto;
+    // std::unique_ptr<IsoSubspace> m_subspaceForDOMSelection;
+    // std::unique_ptr<IsoSubspace> m_subspaceForDOMWindow;
+    // std::unique_ptr<IsoSubspace> m_subspaceForEventSource;
+    // std::unique_ptr<IsoSubspace> m_subspaceForHistory;
+    // std::unique_ptr<IsoSubspace> m_subspaceForIntersectionObserver;
+    // std::unique_ptr<IsoSubspace> m_subspaceForIntersectionObserverEntry;
+    // std::unique_ptr<IsoSubspace> m_subspaceForLocation;
+    // std::unique_ptr<IsoSubspace> m_subspaceForNavigator;
+    // std::unique_ptr<IsoSubspace> m_subspaceForPerformance;
+    // std::unique_ptr<IsoSubspace> m_subspaceForPerformanceEntry;
+    // std::unique_ptr<IsoSubspace> m_subspaceForPerformanceMark;
+    // std::unique_ptr<IsoSubspace> m_subspaceForPerformanceMeasure;
+    // std::unique_ptr<IsoSubspace> m_subspaceForPerformanceNavigation;
+    // std::unique_ptr<IsoSubspace> m_subspaceForPerformanceNavigationTiming;
+    // std::unique_ptr<IsoSubspace> m_subspaceForPerformanceObserver;
+    // std::unique_ptr<IsoSubspace> m_subspaceForPerformanceObserverEntryList;
+    // std::unique_ptr<IsoSubspace> m_subspaceForPerformancePaintTiming;
+    // std::unique_ptr<IsoSubspace> m_subspaceForPerformanceResourceTiming;
+    // std::unique_ptr<IsoSubspace> m_subspaceForPerformanceServerTiming;
+    // std::unique_ptr<IsoSubspace> m_subspaceForPerformanceTiming;
+    // std::unique_ptr<IsoSubspace> m_subspaceForRemoteDOMWindow;
+    // std::unique_ptr<IsoSubspace> m_subspaceForResizeObserver;
+    // std::unique_ptr<IsoSubspace> m_subspaceForResizeObserverEntry;
+    // std::unique_ptr<IsoSubspace> m_subspaceForResizeObserverSize;
+    // std::unique_ptr<IsoSubspace> m_subspaceForScreen;
+    // std::unique_ptr<IsoSubspace> m_subspaceForShadowRealmGlobalScope;
+    // std::unique_ptr<IsoSubspace> m_subspaceForUndoItem;
+    // std::unique_ptr<IsoSubspace> m_subspaceForUndoManager;
+    // std::unique_ptr<IsoSubspace> m_subspaceForUserMessageHandler;
+    // std::unique_ptr<IsoSubspace> m_subspaceForUserMessageHandlersNamespace;
+    // std::unique_ptr<IsoSubspace> m_subspaceForVisualViewport;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebKitNamespace;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebKitPoint;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWorkerNavigator;
+    // std::unique_ptr<IsoSubspace> m_subspaceForDOMMimeType;
+    // std::unique_ptr<IsoSubspace> m_subspaceForDOMMimeTypeArray;
+    // std::unique_ptr<IsoSubspace> m_subspaceForDOMPlugin;
+    // std::unique_ptr<IsoSubspace> m_subspaceForDOMPluginArray;
+    // std::unique_ptr<IsoSubspace> m_subspaceForStorage;
+    // std::unique_ptr<IsoSubspace> m_subspaceForStorageEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGAElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGAltGlyphDefElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGAltGlyphElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGAltGlyphItemElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGAngle;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGAnimateColorElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGAnimateElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGAnimateMotionElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGAnimateTransformElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGAnimatedAngle;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGAnimatedBoolean;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGAnimatedEnumeration;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGAnimatedInteger;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGAnimatedLength;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGAnimatedLengthList;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGAnimatedNumber;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGAnimatedNumberList;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGAnimatedPreserveAspectRatio;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGAnimatedRect;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGAnimatedString;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGAnimatedTransformList;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGAnimationElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGCircleElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGClipPathElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGComponentTransferFunctionElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGCursorElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGDefsElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGDescElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGEllipseElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGFEBlendElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGFEColorMatrixElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGFEComponentTransferElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGFECompositeElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGFEConvolveMatrixElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGFEDiffuseLightingElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGFEDisplacementMapElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGFEDistantLightElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGFEDropShadowElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGFEFloodElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGFEFuncAElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGFEFuncBElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGFEFuncGElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGFEFuncRElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGFEGaussianBlurElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGFEImageElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGFEMergeElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGFEMergeNodeElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGFEMorphologyElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGFEOffsetElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGFEPointLightElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGFESpecularLightingElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGFESpotLightElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGFETileElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGFETurbulenceElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGFilterElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGFontElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGFontFaceElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGFontFaceFormatElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGFontFaceNameElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGFontFaceSrcElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGFontFaceUriElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGForeignObjectElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGGElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGGeometryElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGGlyphElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGGlyphRefElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGGradientElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGGraphicsElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGHKernElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGImageElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGLength;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGLengthList;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGLineElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGLinearGradientElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGMPathElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGMarkerElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGMaskElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGMatrix;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGMetadataElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGMissingGlyphElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGNumber;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGNumberList;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGPathElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGPathSeg;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGPathSegArcAbs;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGPathSegArcRel;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGPathSegClosePath;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGPathSegCurvetoCubicAbs;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGPathSegCurvetoCubicRel;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGPathSegCurvetoCubicSmoothAbs;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGPathSegCurvetoCubicSmoothRel;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGPathSegCurvetoQuadraticAbs;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGPathSegCurvetoQuadraticRel;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGPathSegCurvetoQuadraticSmoothAbs;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGPathSegCurvetoQuadraticSmoothRel;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGPathSegLinetoAbs;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGPathSegLinetoHorizontalAbs;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGPathSegLinetoHorizontalRel;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGPathSegLinetoRel;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGPathSegLinetoVerticalAbs;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGPathSegLinetoVerticalRel;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGPathSegList;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGPathSegMovetoAbs;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGPathSegMovetoRel;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGPatternElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGPoint;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGPointList;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGPolygonElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGPolylineElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGPreserveAspectRatio;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGRadialGradientElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGRect;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGRectElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGRenderingIntent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGSVGElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGScriptElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGSetElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGStopElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGStringList;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGStyleElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGSwitchElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGSymbolElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGTRefElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGTSpanElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGTextContentElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGTextElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGTextPathElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGTextPositioningElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGTitleElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGTransform;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGTransformList;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGUnitTypes;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGUseElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGVKernElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGViewElement;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGViewSpec;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSVGZoomEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForGCObservation;
+    // std::unique_ptr<IsoSubspace> m_subspaceForInternalSettings;
+    // std::unique_ptr<IsoSubspace> m_subspaceForInternals;
+    // std::unique_ptr<IsoSubspace> m_subspaceForInternalsMapLike;
+    // std::unique_ptr<IsoSubspace> m_subspaceForInternalsSetLike;
+    // std::unique_ptr<IsoSubspace> m_subspaceForMallocStatistics;
+    // std::unique_ptr<IsoSubspace> m_subspaceForMemoryInfo;
+    // std::unique_ptr<IsoSubspace> m_subspaceForMockCDMFactory;
+    // std::unique_ptr<IsoSubspace> m_subspaceForMockContentFilterSettings;
+    // std::unique_ptr<IsoSubspace> m_subspaceForMockPageOverlay;
+    // std::unique_ptr<IsoSubspace> m_subspaceForMockPaymentCoordinator;
+    // std::unique_ptr<IsoSubspace> m_subspaceForServiceWorkerInternals;
+    // std::unique_ptr<IsoSubspace> m_subspaceForTypeConversions;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebFakeXRDevice;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebFakeXRInputController;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWebXRTest;
+    // std::unique_ptr<IsoSubspace> m_subspaceForDedicatedWorkerGlobalScope;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWorker;
+    std::unique_ptr<IsoSubspace> m_subspaceForWorkerGlobalScope;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWorkerLocation;
+    // std::unique_ptr<IsoSubspace> m_subspaceForExtendableEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForExtendableMessageEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForFetchEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForNavigationPreloadManager;
+    // std::unique_ptr<IsoSubspace> m_subspaceForServiceWorker;
+    // std::unique_ptr<IsoSubspace> m_subspaceForServiceWorkerClient;
+    // std::unique_ptr<IsoSubspace> m_subspaceForServiceWorkerClients;
+    // std::unique_ptr<IsoSubspace> m_subspaceForServiceWorkerContainer;
+    // std::unique_ptr<IsoSubspace> m_subspaceForServiceWorkerGlobalScope;
+    // std::unique_ptr<IsoSubspace> m_subspaceForServiceWorkerRegistration;
+    // std::unique_ptr<IsoSubspace> m_subspaceForServiceWorkerWindowClient;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSharedWorker;
+    // std::unique_ptr<IsoSubspace> m_subspaceForSharedWorkerGlobalScope;
+    // std::unique_ptr<IsoSubspace> m_subspaceForPaintWorkletGlobalScope;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWorklet;
+    // std::unique_ptr<IsoSubspace> m_subspaceForWorkletGlobalScope;
+    // std::unique_ptr<IsoSubspace> m_subspaceForDOMParser;
+    // std::unique_ptr<IsoSubspace> m_subspaceForXMLHttpRequest;
+    // std::unique_ptr<IsoSubspace> m_subspaceForXMLHttpRequestEventTarget;
+    // std::unique_ptr<IsoSubspace> m_subspaceForXMLHttpRequestProgressEvent;
+    // std::unique_ptr<IsoSubspace> m_subspaceForXMLHttpRequestUpload;
+    // std::unique_ptr<IsoSubspace> m_subspaceForXMLSerializer;
+    // std::unique_ptr<IsoSubspace> m_subspaceForXPathEvaluator;
+    // std::unique_ptr<IsoSubspace> m_subspaceForXPathExpression;
+    // std::unique_ptr<IsoSubspace> m_subspaceForXPathNSResolver;
+    // std::unique_ptr<IsoSubspace> m_subspaceForXPathResult;
+    // std::unique_ptr<IsoSubspace> m_subspaceForXSLTProcessor;
+
+    std::unique_ptr<IsoSubspace> m_subspaceForGlobalObject;
+
+    std::unique_ptr<IsoSubspace> m_subspaceForExposedToWorkerAndWindow;
+    std::unique_ptr<IsoSubspace> m_subspaceForURLSearchParams;
+    std::unique_ptr<IsoSubspace> m_subspaceForURLSearchParamsIterator;
+
+    std::unique_ptr<IsoSubspace> m_subspaceForDOMException;
+    std::unique_ptr<IsoSubspace> m_subspaceForDOMFormData;
+    std::unique_ptr<IsoSubspace> m_subspaceForDOMFormDataIterator;
+    std::unique_ptr<IsoSubspace> m_subspaceForDOMURL;
+};
+} // namespace WebCore
+
+namespace WebCore {
+using DOMIsoSubspaces = WebCore::DOMIsoSubspaces;
+}
\ No newline at end of file
diff --git a/src/javascript/jsc/bindings/webcore/ExceptionDetails.h b/src/javascript/jsc/bindings/webcore/ExceptionDetails.h
new file mode 100644
index 000000000..d25c2e462
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/ExceptionDetails.h
@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2019 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "wtf/text/WTFString.h"
+
+namespace WebCore {
+
+struct ExceptionDetails {
+    enum class Type : uint8_t {
+        Script,
+        InvalidTargetFrame,
+        AppBoundDomain,
+    };
+
+    String message;
+    int lineNumber { 0 };
+    int columnNumber { 0 };
+    Type type { Type::Script };
+
+    // This bizarre explicit initialization of String is because older compilers (like on High Sierra)
+    // don't properly handle partial initialization lists unless every struct member has an explicit default value.
+    // Once we stop building on those platforms we can remove this.
+    String sourceURL {};
+};
+
+} // namespace WebCore
+
+namespace WTF {
+template<> struct EnumTraits<WebCore::ExceptionDetails::Type> {
+    using values = EnumValues<
+        WebCore::ExceptionDetails::Type,
+        WebCore::ExceptionDetails::Type::Script,
+        WebCore::ExceptionDetails::Type::InvalidTargetFrame,
+        WebCore::ExceptionDetails::Type::AppBoundDomain>;
+};
+}
diff --git a/src/javascript/jsc/bindings/webcore/ExtendedDOMClientIsoSubspaces.h b/src/javascript/jsc/bindings/webcore/ExtendedDOMClientIsoSubspaces.h
new file mode 100644
index 000000000..174eaa194
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/ExtendedDOMClientIsoSubspaces.h
@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2022 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "DOMClientIsoSubspaces.h"
+
+namespace WebCore {
+
+class ExtendedDOMClientIsoSubspaces : public DOMClientIsoSubspaces {
+public:
+    ExtendedDOMClientIsoSubspaces() = default;
+};
+
+} // namespace WebCore
+
+namespace WebCore {
+using ExtendedDOMClientIsoSubspaces = WebCore::ExtendedDOMClientIsoSubspaces;
+}
\ No newline at end of file
diff --git a/src/javascript/jsc/bindings/webcore/ExtendedDOMIsoSubspaces.h b/src/javascript/jsc/bindings/webcore/ExtendedDOMIsoSubspaces.h
new file mode 100644
index 000000000..d5ccb4288
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/ExtendedDOMIsoSubspaces.h
@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2022 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "DOMIsoSubspaces.h"
+
+namespace WebCore {
+
+class ExtendedDOMIsoSubspaces : public DOMIsoSubspaces {
+public:
+    ExtendedDOMIsoSubspaces() = default;
+};
+
+} // namespace WebCore
diff --git a/src/javascript/jsc/bindings/webcore/JSDOMAttribute.h b/src/javascript/jsc/bindings/webcore/JSDOMAttribute.h
new file mode 100644
index 000000000..17b0f588c
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/JSDOMAttribute.h
@@ -0,0 +1,136 @@
+/*
+ *  Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
+ *  Copyright (C) 2003-2020 Apple Inc. All rights reserved.
+ *  Copyright (C) 2007 Samuel Weinig <sam@webkit.org>
+ *  Copyright (C) 2009 Google, Inc. All rights reserved.
+ *  Copyright (C) 2012 Ericsson AB. All rights reserved.
+ *  Copyright (C) 2013 Michael Pruett <michael@68k.org>
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#pragma once
+
+#include "JSDOMCastThisValue.h"
+#include "JSDOMExceptionHandling.h"
+
+namespace WebCore {
+
+template<typename JSClass>
+class IDLAttribute {
+public:
+    using Setter = bool(JSC::JSGlobalObject&, JSClass&, JSC::JSValue);
+    using SetterPassingPropertyName = bool(JSC::JSGlobalObject&, JSClass&, JSC::JSValue, JSC::PropertyName);
+    using StaticSetter = bool(JSC::JSGlobalObject&, JSC::JSValue);
+    using Getter = JSC::JSValue(JSC::JSGlobalObject&, JSClass&);
+    using GetterPassingPropertyName = JSC::JSValue(JSC::JSGlobalObject&, JSClass&, JSC::PropertyName);
+    using StaticGetter = JSC::JSValue(JSC::JSGlobalObject&);
+
+    template<Setter setter, CastedThisErrorBehavior shouldThrow = CastedThisErrorBehavior::Throw>
+    static bool set(JSC::JSGlobalObject& lexicalGlobalObject, JSC::EncodedJSValue thisValue, JSC::EncodedJSValue encodedValue, JSC::PropertyName attributeName)
+    {
+        auto throwScope = DECLARE_THROW_SCOPE(JSC::getVM(&lexicalGlobalObject));
+
+        auto* thisObject = castThisValue<JSClass>(lexicalGlobalObject, JSC::JSValue::decode(thisValue));
+        if (UNLIKELY(!thisObject)) {
+            if constexpr (shouldThrow == CastedThisErrorBehavior::Throw)
+                return JSC::throwVMDOMAttributeSetterTypeError(&lexicalGlobalObject, throwScope, JSClass::info(), attributeName);
+            else
+                return false;
+        }
+
+        RELEASE_AND_RETURN(throwScope, (setter(lexicalGlobalObject, *thisObject, JSC::JSValue::decode(encodedValue))));
+    }
+
+    // FIXME: FIXME: This can be merged with `set` if we replace the explicit setter function template parameter with a generic lambda.
+    template<SetterPassingPropertyName setter, CastedThisErrorBehavior shouldThrow = CastedThisErrorBehavior::Throw>
+    static bool setPassingPropertyName(JSC::JSGlobalObject& lexicalGlobalObject, JSC::EncodedJSValue thisValue, JSC::EncodedJSValue encodedValue, JSC::PropertyName attributeName)
+    {
+        auto throwScope = DECLARE_THROW_SCOPE(JSC::getVM(&lexicalGlobalObject));
+
+        auto* thisObject = castThisValue<JSClass>(lexicalGlobalObject, JSC::JSValue::decode(thisValue));
+        if (UNLIKELY(!thisObject)) {
+            if constexpr (shouldThrow == CastedThisErrorBehavior::Throw)
+                return JSC::throwVMDOMAttributeSetterTypeError(&lexicalGlobalObject, throwScope, JSClass::info(), attributeName);
+            else
+                return false;
+        }
+
+        RELEASE_AND_RETURN(throwScope, (setter(lexicalGlobalObject, *thisObject, JSC::JSValue::decode(encodedValue), attributeName)));
+    }
+
+    template<StaticSetter setter, CastedThisErrorBehavior shouldThrow = CastedThisErrorBehavior::Throw>
+    static bool setStatic(JSC::JSGlobalObject& lexicalGlobalObject, JSC::EncodedJSValue, JSC::EncodedJSValue encodedValue, JSC::PropertyName)
+    {
+        return setter(lexicalGlobalObject, JSC::JSValue::decode(encodedValue));
+    }
+    
+    template<Getter getter, CastedThisErrorBehavior shouldThrow = CastedThisErrorBehavior::Throw>
+    static JSC::EncodedJSValue get(JSC::JSGlobalObject& lexicalGlobalObject, JSC::EncodedJSValue thisValue, JSC::PropertyName attributeName)
+    {
+        auto throwScope = DECLARE_THROW_SCOPE(JSC::getVM(&lexicalGlobalObject));
+
+        if constexpr (shouldThrow == CastedThisErrorBehavior::Assert) {
+            ASSERT(castThisValue<JSClass>(lexicalGlobalObject, JSC::JSValue::decode(thisValue)));
+            auto* thisObject = JSC::jsCast<JSClass*>(JSC::JSValue::decode(thisValue));
+            RELEASE_AND_RETURN(throwScope, (JSC::JSValue::encode(getter(lexicalGlobalObject, *thisObject))));
+        } else {
+            auto* thisObject = castThisValue<JSClass>(lexicalGlobalObject, JSC::JSValue::decode(thisValue));
+            if (UNLIKELY(!thisObject)) {
+                if constexpr (shouldThrow == CastedThisErrorBehavior::Throw)
+                    return JSC::throwVMDOMAttributeGetterTypeError(&lexicalGlobalObject, throwScope, JSClass::info(), attributeName);
+                else if constexpr (shouldThrow == CastedThisErrorBehavior::RejectPromise)
+                    RELEASE_AND_RETURN(throwScope, rejectPromiseWithGetterTypeError(lexicalGlobalObject, JSClass::info(), attributeName));
+                else
+                    return JSC::JSValue::encode(JSC::jsUndefined());
+            }
+
+            RELEASE_AND_RETURN(throwScope, (JSC::JSValue::encode(getter(lexicalGlobalObject, *thisObject))));
+        }
+    }
+
+    // FIXME: This can be merged with `get` if we replace the explicit setter function template parameter with a generic lambda.
+    template<GetterPassingPropertyName getter, CastedThisErrorBehavior shouldThrow = CastedThisErrorBehavior::Throw>
+    static JSC::EncodedJSValue getPassingPropertyName(JSC::JSGlobalObject& lexicalGlobalObject, JSC::EncodedJSValue thisValue, JSC::PropertyName attributeName)
+    {
+        auto throwScope = DECLARE_THROW_SCOPE(JSC::getVM(&lexicalGlobalObject));
+
+        if constexpr (shouldThrow == CastedThisErrorBehavior::Assert) {
+            ASSERT(castThisValue<JSClass>(lexicalGlobalObject, JSC::JSValue::decode(thisValue)));
+            auto* thisObject = JSC::jsCast<JSClass*>(JSC::JSValue::decode(thisValue));
+            RELEASE_AND_RETURN(throwScope, (JSC::JSValue::encode(getter(lexicalGlobalObject, *thisObject, attributeName))));
+        } else {
+            auto* thisObject = castThisValue<JSClass>(lexicalGlobalObject, JSC::JSValue::decode(thisValue));
+            if (UNLIKELY(!thisObject)) {
+                if constexpr (shouldThrow == CastedThisErrorBehavior::Throw)
+                    return JSC::throwVMDOMAttributeGetterTypeError(&lexicalGlobalObject, throwScope, JSClass::info(), attributeName);
+                else if constexpr (shouldThrow == CastedThisErrorBehavior::RejectPromise)
+                    RELEASE_AND_RETURN(throwScope, rejectPromiseWithGetterTypeError(lexicalGlobalObject, JSClass::info(), attributeName));
+                else
+                    return JSC::JSValue::encode(JSC::jsUndefined());
+            }
+
+            RELEASE_AND_RETURN(throwScope, (JSC::JSValue::encode(getter(lexicalGlobalObject, *thisObject, attributeName))));
+        }
+    }
+
+    template<StaticGetter getter, CastedThisErrorBehavior shouldThrow = CastedThisErrorBehavior::Throw>
+    static JSC::EncodedJSValue getStatic(JSC::JSGlobalObject& lexicalGlobalObject, JSC::EncodedJSValue, JSC::PropertyName)
+    {
+        return JSC::JSValue::encode(getter(lexicalGlobalObject));
+    }
+};
+
+} // namespace WebCore
diff --git a/src/javascript/jsc/bindings/webcore/JSDOMBindingInternalsBuiltins.cpp b/src/javascript/jsc/bindings/webcore/JSDOMBindingInternalsBuiltins.cpp
new file mode 100644
index 000000000..2ae04a290
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/JSDOMBindingInternalsBuiltins.cpp
@@ -0,0 +1,79 @@
+// /*
+//  * Copyright (c) 2016 Apple Inc. All rights reserved.
+//  * Copyright (c) 2017 Apple Inc.
+//  *
+//  * Redistribution and use in source and binary forms, with or without
+//  * modification, are permitted provided that the following conditions
+//  * are met:
+//  * 1. Redistributions of source code must retain the above copyright
+//  *    notice, this list of conditions and the following disclaimer.
+//  * 2. Redistributions in binary form must reproduce the above copyright
+//  *    notice, this list of conditions and the following disclaimer in the
+//  *    documentation and/or other materials provided with the distribution.
+//  *
+//  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+//  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+//  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+//  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+//  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+//  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+//  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+//  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+//  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+//  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+//  * THE POSSIBILITY OF SUCH DAMAGE.
+//  *
+//  */
+
+// // DO NOT EDIT THIS FILE. It is automatically generated from JavaScript files for
+// // builtins by the script: Source/JavaScriptCore/Scripts/generate-js-builtins.py
+
+// #include "config.h"
+// #include "JSDOMBindingInternalsBuiltins.h"
+
+// #include "WebCoreJSClientData.h"
+// #include "JavaScriptCore/HeapInlines.h"
+// #include "JavaScriptCore/IdentifierInlines.h"
+// #include "JavaScriptCore/Intrinsic.h"
+// #include "JavaScriptCore/JSCJSValueInlines.h"
+// #include "JavaScriptCore/JSCellInlines.h"
+// #include "JavaScriptCore/StructureInlines.h"
+// #include "JavaScriptCore/VM.h"
+
+// namespace WebCore {
+
+// const JSC::ConstructAbility s_jsDOMBindingInternalsForEachWrapperCodeConstructAbility = JSC::ConstructAbility::CannotConstruct;
+// const JSC::ConstructorKind s_jsDOMBindingInternalsForEachWrapperCodeConstructorKind = JSC::ConstructorKind::None;
+// const int s_jsDOMBindingInternalsForEachWrapperCodeLength = 170;
+// static const JSC::Intrinsic s_jsDOMBindingInternalsForEachWrapperCodeIntrinsic = JSC::NoIntrinsic;
+// const char* const s_jsDOMBindingInternalsForEachWrapperCode =
+//     "(function (mapLikeOrSetLike, callback)\n" \
+//     "{\n" \
+//     "    \"use strict\";\n" \
+//     "    mapLikeOrSetLike.forEach((value, key, backingMapOrSet) => {\n" \
+//     "        callback(value, key, this);\n" \
+//     "    });\n" \
+//     "})\n" \
+// ;
+
+// const JSC::ConstructAbility s_jsDOMBindingInternalsGetUserMediaShimCodeConstructAbility = JSC::ConstructAbility::CannotConstruct;
+// const JSC::ConstructorKind s_jsDOMBindingInternalsGetUserMediaShimCodeConstructorKind = JSC::ConstructorKind::None;
+// const int s_jsDOMBindingInternalsGetUserMediaShimCodeLength = 147;
+// static const JSC::Intrinsic s_jsDOMBindingInternalsGetUserMediaShimCodeIntrinsic = JSC::NoIntrinsic;
+// const char* const s_jsDOMBindingInternalsGetUserMediaShimCode =
+//     "(function (constraints, successCallback, errorCallback)\n" \
+//     "{\n" \
+//     "    this.mediaDevices.getUserMedia(constraints).then(successCallback, errorCallback);\n" \
+//     "})\n" \
+// ;
+
+// #define DEFINE_BUILTIN_GENERATOR(codeName, functionName, overriddenName, argumentCount) \
+// JSC::FunctionExecutable* codeName##Generator(JSC::VM& vm) \
+// {\
+//     JSVMClientData* clientData = static_cast<JSVMClientData*>(vm.clientData); \
+//     return clientData->builtinFunctions().jsDOMBindingInternalsBuiltins().codeName##Executable()->link(vm, nullptr, clientData->builtinFunctions().jsDOMBindingInternalsBuiltins().codeName##Source(), std::nullopt, s_##codeName##Intrinsic); \
+// }
+// WEBCORE_FOREACH_JSDOMBINDINGINTERNALS_BUILTIN_CODE(DEFINE_BUILTIN_GENERATOR)
+// #undef DEFINE_BUILTIN_GENERATOR
+
+// } // namespace WebCore
diff --git a/src/javascript/jsc/bindings/webcore/JSDOMBindingInternalsBuiltins.h b/src/javascript/jsc/bindings/webcore/JSDOMBindingInternalsBuiltins.h
new file mode 100644
index 000000000..40b698c3a
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/JSDOMBindingInternalsBuiltins.h
@@ -0,0 +1,159 @@
+// /*
+//  * Copyright (c) 2016 Apple Inc. All rights reserved.
+//  * Copyright (c) 2017 Apple Inc.
+//  *
+//  * Redistribution and use in source and binary forms, with or without
+//  * modification, are permitted provided that the following conditions
+//  * are met:
+//  * 1. Redistributions of source code must retain the above copyright
+//  *    notice, this list of conditions and the following disclaimer.
+//  * 2. Redistributions in binary form must reproduce the above copyright
+//  *    notice, this list of conditions and the following disclaimer in the
+//  *    documentation and/or other materials provided with the distribution.
+//  *
+//  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+//  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+//  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+//  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+//  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+//  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+//  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+//  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+//  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+//  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+//  * THE POSSIBILITY OF SUCH DAMAGE.
+//  *
+//  */
+
+// // DO NOT EDIT THIS FILE. It is automatically generated from JavaScript files for
+// // builtins by the script: Source/JavaScriptCore/Scripts/generate-js-builtins.py
+
+// #pragma once
+
+// #include "JavaScriptCore/BuiltinUtils.h"
+// #include "JavaScriptCore/Identifier.h"
+// #include "JavaScriptCore/JSFunction.h"
+// #include "JavaScriptCore/UnlinkedFunctionExecutable.h"
+
+// namespace JSC {
+// class FunctionExecutable;
+// }
+
+// namespace WebCore {
+
+// /* JSDOMBindingInternals */
+// extern const char* const s_jsDOMBindingInternalsForEachWrapperCode;
+// extern const int s_jsDOMBindingInternalsForEachWrapperCodeLength;
+// extern const JSC::ConstructAbility s_jsDOMBindingInternalsForEachWrapperCodeConstructAbility;
+// extern const JSC::ConstructorKind s_jsDOMBindingInternalsForEachWrapperCodeConstructorKind;
+// extern const char* const s_jsDOMBindingInternalsGetUserMediaShimCode;
+// extern const int s_jsDOMBindingInternalsGetUserMediaShimCodeLength;
+// extern const JSC::ConstructAbility s_jsDOMBindingInternalsGetUserMediaShimCodeConstructAbility;
+// extern const JSC::ConstructorKind s_jsDOMBindingInternalsGetUserMediaShimCodeConstructorKind;
+
+// #define WEBCORE_BUILTIN_JSDOMBINDINGINTERNALS_FOREACHWRAPPER 0
+// #define WEBCORE_BUILTIN_JSDOMBINDINGINTERNALS_GETUSERMEDIASHIM 0
+
+// #define WEBCORE_FOREACH_JSDOMBINDINGINTERNALS_BUILTIN_CODE(macro)                                                                                      \
+//     macro(jsDOMBindingInternalsForEachWrapperCode, forEachWrapper, static_cast<const char*>(nullptr), s_jsDOMBindingInternalsForEachWrapperCodeLength) \
+//         macro(jsDOMBindingInternalsGetUserMediaShimCode, getUserMediaShim, static_cast<const char*>(nullptr), s_jsDOMBindingInternalsGetUserMediaShimCodeLength)
+
+// #define DECLARE_BUILTIN_GENERATOR(codeName, functionName, overriddenName, argumentCount) \
+//     JSC::FunctionExecutable* codeName##Generator(JSC::VM&);
+
+// WEBCORE_FOREACH_JSDOMBINDINGINTERNALS_BUILTIN_CODE(DECLARE_BUILTIN_GENERATOR)
+// #undef DECLARE_BUILTIN_GENERATOR
+
+// class JSDOMBindingInternalsBuiltinsWrapper : private JSC::WeakHandleOwner {
+// public:
+//     explicit JSDOMBindingInternalsBuiltinsWrapper(JSC::VM& vm)
+//         : m_vm(vm)
+//             WEBCORE_FOREACH_JSDOMBINDINGINTERNALS_BUILTIN_FUNCTION_NAME(INITIALIZE_BUILTIN_NAMES)
+// #define INITIALIZE_BUILTIN_SOURCE_MEMBERS(name, functionName, overriddenName, length) , m_##name##Source(JSC::makeSource(StringImpl::createFromLiteral(s_##name, length), {}))
+//                 WEBCORE_FOREACH_JSDOMBINDINGINTERNALS_BUILTIN_CODE(INITIALIZE_BUILTIN_SOURCE_MEMBERS)
+// #undef INITIALIZE_BUILTIN_SOURCE_MEMBERS
+//     {
+//     }
+
+// #define EXPOSE_BUILTIN_EXECUTABLES(name, functionName, overriddenName, length) \
+//     JSC::UnlinkedFunctionExecutable* name##Executable();                       \
+//     const JSC::SourceCode& name##Source() const { return m_##name##Source; }
+//     WEBCORE_FOREACH_JSDOMBINDINGINTERNALS_BUILTIN_CODE(EXPOSE_BUILTIN_EXECUTABLES)
+// #undef EXPOSE_BUILTIN_EXECUTABLES
+
+//     WEBCORE_FOREACH_JSDOMBINDINGINTERNALS_BUILTIN_FUNCTION_NAME(DECLARE_BUILTIN_IDENTIFIER_ACCESSOR)
+
+//     void exportNames();
+
+// private:
+//     JSC::VM& m_vm;
+
+//     WEBCORE_FOREACH_JSDOMBINDINGINTERNALS_BUILTIN_FUNCTION_NAME(DECLARE_BUILTIN_NAMES)
+
+// #define DECLARE_BUILTIN_SOURCE_MEMBERS(name, functionName, overriddenName, length) \
+//     JSC::SourceCode m_##name##Source;                                              \
+//     JSC::Weak<JSC::UnlinkedFunctionExecutable> m_##name##Executable;
+//     WEBCORE_FOREACH_JSDOMBINDINGINTERNALS_BUILTIN_CODE(DECLARE_BUILTIN_SOURCE_MEMBERS)
+// #undef DECLARE_BUILTIN_SOURCE_MEMBERS
+// };
+
+// #define DEFINE_BUILTIN_EXECUTABLES(name, functionName, overriddenName, length)                                                                                                                                                           \
+//     inline JSC::UnlinkedFunctionExecutable* JSDOMBindingInternalsBuiltinsWrapper::name##Executable()                                                                                                                                     \
+//     {                                                                                                                                                                                                                                    \
+//         if (!m_##name##Executable) {                                                                                                                                                                                                     \
+//             JSC::Identifier executableName = functionName##PublicName();                                                                                                                                                                 \
+//             if (overriddenName)                                                                                                                                                                                                          \
+//                 executableName = JSC::Identifier::fromString(m_vm, overriddenName);                                                                                                                                                      \
+//             m_##name##Executable = JSC::Weak<JSC::UnlinkedFunctionExecutable>(JSC::createBuiltinExecutable(m_vm, m_##name##Source, executableName, s_##name##ConstructorKind, s_##name##ConstructAbility), this, &m_##name##Executable); \
+//         }                                                                                                                                                                                                                                \
+//         return m_##name##Executable.get();                                                                                                                                                                                               \
+//     }
+// WEBCORE_FOREACH_JSDOMBINDINGINTERNALS_BUILTIN_CODE(DEFINE_BUILTIN_EXECUTABLES)
+// #undef DEFINE_BUILTIN_EXECUTABLES
+
+// inline void JSDOMBindingInternalsBuiltinsWrapper::exportNames()
+// {
+// #define EXPORT_FUNCTION_NAME(name) m_vm.propertyNames->appendExternalName(name##PublicName(), name##PrivateName());
+//     WEBCORE_FOREACH_JSDOMBINDINGINTERNALS_BUILTIN_FUNCTION_NAME(EXPORT_FUNCTION_NAME)
+// #undef EXPORT_FUNCTION_NAME
+// }
+
+// class JSDOMBindingInternalsBuiltinFunctions {
+// public:
+//     explicit JSDOMBindingInternalsBuiltinFunctions(JSC::VM& vm)
+//         : m_vm(vm)
+//     {
+//     }
+
+//     void init(JSC::JSGlobalObject&);
+//     template<typename Visitor> void visit(Visitor&);
+
+// public:
+//     JSC::VM& m_vm;
+
+// #define DECLARE_BUILTIN_SOURCE_MEMBERS(functionName) \
+//     JSC::WriteBarrier<JSC::JSFunction> m_##functionName##Function;
+//     WEBCORE_FOREACH_JSDOMBINDINGINTERNALS_BUILTIN_FUNCTION_NAME(DECLARE_BUILTIN_SOURCE_MEMBERS)
+// #undef DECLARE_BUILTIN_SOURCE_MEMBERS
+// };
+
+// inline void JSDOMBindingInternalsBuiltinFunctions::init(JSC::JSGlobalObject& globalObject)
+// {
+// #define EXPORT_FUNCTION(codeName, functionName, overriddenName, length) \
+//     m_##functionName##Function.set(m_vm, &globalObject, JSC::JSFunction::create(m_vm, codeName##Generator(m_vm), &globalObject));
+//     WEBCORE_FOREACH_JSDOMBINDINGINTERNALS_BUILTIN_CODE(EXPORT_FUNCTION)
+// #undef EXPORT_FUNCTION
+// }
+
+// template<typename Visitor>
+// inline void JSDOMBindingInternalsBuiltinFunctions::visit(Visitor& visitor)
+// {
+// #define VISIT_FUNCTION(name) visitor.append(m_##name##Function);
+//     WEBCORE_FOREACH_JSDOMBINDINGINTERNALS_BUILTIN_FUNCTION_NAME(VISIT_FUNCTION)
+// #undef VISIT_FUNCTION
+// }
+
+// template void JSDOMBindingInternalsBuiltinFunctions::visit(JSC::AbstractSlotVisitor&);
+// template void JSDOMBindingInternalsBuiltinFunctions::visit(JSC::SlotVisitor&);
+
+// } // namespace WebCore
diff --git a/src/javascript/jsc/bindings/webcore/JSDOMCastThisValue.h b/src/javascript/jsc/bindings/webcore/JSDOMCastThisValue.h
new file mode 100644
index 000000000..ada862b72
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/JSDOMCastThisValue.h
@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
+ * Copyright (C) 2003-2006, 2008-2009, 2013, 2016 Apple Inc. All rights reserved.
+ * Copyright (C) 2007 Samuel Weinig <sam@webkit.org>
+ * Copyright (C) 2009 Google, Inc. All rights reserved.
+ * Copyright (C) 2012 Ericsson AB. All rights reserved.
+ * Copyright (C) 2013 Michael Pruett <michael@68k.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "JSDOMGlobalObject.h"
+
+namespace WebCore {
+
+enum class CastedThisErrorBehavior : uint8_t {
+    Throw,
+    ReturnEarly,
+    RejectPromise,
+    Assert,
+};
+
+template<class JSClass>
+JSClass* castThisValue(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue thisValue)
+{
+    auto& vm = JSC::getVM(&lexicalGlobalObject);
+    if constexpr (std::is_base_of_v<JSDOMGlobalObject, JSClass>)
+        return toJSDOMGlobalObject<JSClass>(vm, thisValue.isUndefinedOrNull() ? JSC::JSValue(&lexicalGlobalObject) : thisValue);
+    else
+        return JSC::jsDynamicCast<JSClass*>(vm, thisValue);
+}
+
+}
diff --git a/src/javascript/jsc/bindings/webcore/JSDOMConstructor.h b/src/javascript/jsc/bindings/webcore/JSDOMConstructor.h
new file mode 100644
index 000000000..af969de89
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/JSDOMConstructor.h
@@ -0,0 +1,72 @@
+/*
+ *  Copyright (C) 2015, 2016 Canon Inc. All rights reserved.
+ *  Copyright (C) 2016-2021 Apple Inc. All rights reserved.
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#pragma once
+
+#include "JSDOMConstructorBase.h"
+
+namespace WebCore {
+
+template<typename JSClass> class JSDOMConstructor final : public JSDOMConstructorBase {
+public:
+    using Base = JSDOMConstructorBase;
+
+    static JSDOMConstructor* create(JSC::VM&, JSC::Structure*, JSDOMGlobalObject&);
+    static JSC::Structure* createStructure(JSC::VM&, JSC::JSGlobalObject&, JSC::JSValue prototype);
+
+    DECLARE_INFO;
+
+    // Must be defined for each specialization class.
+    static JSC::JSValue prototypeForStructure(JSC::VM&, const JSDOMGlobalObject&);
+
+    // Must be defined for each specialization class.
+    static JSC::EncodedJSValue JSC_HOST_CALL_ATTRIBUTES construct(JSC::JSGlobalObject*, JSC::CallFrame*);
+
+private:
+    JSDOMConstructor(JSC::VM& vm, JSC::Structure* structure)
+        : Base(vm, structure, construct)
+    {
+    }
+
+    void finishCreation(JSC::VM&, JSDOMGlobalObject&);
+
+    // Usually defined for each specialization class.
+    void initializeProperties(JSC::VM&, JSDOMGlobalObject&) { }
+};
+
+template<typename JSClass> inline JSDOMConstructor<JSClass>* JSDOMConstructor<JSClass>::create(JSC::VM& vm, JSC::Structure* structure, JSDOMGlobalObject& globalObject)
+{
+    JSDOMConstructor* constructor = new (NotNull, JSC::allocateCell<JSDOMConstructor>(vm)) JSDOMConstructor(vm, structure);
+    constructor->finishCreation(vm, globalObject);
+    return constructor;
+}
+
+template<typename JSClass> inline JSC::Structure* JSDOMConstructor<JSClass>::createStructure(JSC::VM& vm, JSC::JSGlobalObject& globalObject, JSC::JSValue prototype)
+{
+    return JSC::Structure::create(vm, &globalObject, prototype, JSC::TypeInfo(JSC::InternalFunctionType, StructureFlags), info());
+}
+
+template<typename JSClass> inline void JSDOMConstructor<JSClass>::finishCreation(JSC::VM& vm, JSDOMGlobalObject& globalObject)
+{
+    Base::finishCreation(vm);
+    ASSERT(inherits(vm, info()));
+    initializeProperties(vm, globalObject);
+}
+
+} // namespace WebCore
diff --git a/src/javascript/jsc/bindings/webcore/JSDOMConstructorBase.cpp b/src/javascript/jsc/bindings/webcore/JSDOMConstructorBase.cpp
new file mode 100644
index 000000000..90170e910
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/JSDOMConstructorBase.cpp
@@ -0,0 +1,54 @@
+/*
+ *  Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
+ *  Copyright (C) 2004-2022 Apple Inc. All rights reserved.
+ *  Copyright (C) 2007 Samuel Weinig <sam@webkit.org>
+ *  Copyright (C) 2013 Michael Pruett <michael@68k.org>
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include "config.h"
+#include "JSDOMConstructor.h"
+
+#include "JavaScriptCore/JSCInlines.h"
+#include "WebCoreJSClientData.h"
+
+namespace WebCore {
+using namespace JSC;
+
+STATIC_ASSERT_IS_TRIVIALLY_DESTRUCTIBLE(JSDOMConstructorBase);
+
+JSC_DEFINE_HOST_FUNCTION(callThrowTypeErrorForJSDOMConstructor, (JSGlobalObject * globalObject, CallFrame*))
+{
+    VM& vm = globalObject->vm();
+    auto scope = DECLARE_THROW_SCOPE(vm);
+    throwTypeError(globalObject, scope, "Constructor requires 'new' operator"_s);
+    return JSValue::encode(jsNull());
+}
+
+JSC_DEFINE_HOST_FUNCTION(callThrowTypeErrorForJSDOMConstructorNotConstructable, (JSC::JSGlobalObject * globalObject, JSC::CallFrame*))
+{
+    JSC::VM& vm = globalObject->vm();
+    auto scope = DECLARE_THROW_SCOPE(vm);
+    JSC::throwTypeError(globalObject, scope, "Illegal constructor"_s);
+    return JSC::JSValue::encode(JSC::jsNull());
+}
+
+JSC::GCClient::IsoSubspace* JSDOMConstructorBase::subspaceForImpl(JSC::VM& vm)
+{
+    return &static_cast<JSVMClientData*>(vm.clientData)->domConstructorSpace();
+}
+
+} // namespace WebCore
diff --git a/src/javascript/jsc/bindings/webcore/JSDOMConstructorBase.h b/src/javascript/jsc/bindings/webcore/JSDOMConstructorBase.h
new file mode 100644
index 000000000..a5b644d19
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/JSDOMConstructorBase.h
@@ -0,0 +1,63 @@
+/*
+ *  Copyright (C) 2015, 2016 Canon Inc. All rights reserved.
+ *  Copyright (C) 2016-2022 Apple Inc. All rights reserved.
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#pragma once
+
+#include "JSDOMGlobalObject.h"
+#include "JavaScriptCore/InternalFunction.h"
+
+#include "ZigGlobalObject.h"
+
+namespace WebCore {
+
+JSC_DECLARE_HOST_FUNCTION(callThrowTypeErrorForJSDOMConstructor);
+JSC_DECLARE_HOST_FUNCTION(callThrowTypeErrorForJSDOMConstructorNotConstructable);
+
+// Base class for all callable constructor objects in the JSC bindings.
+class JSDOMConstructorBase : public JSC::InternalFunction {
+public:
+    using Base = InternalFunction;
+
+    static constexpr unsigned StructureFlags = Base::StructureFlags;
+    static constexpr bool needsDestruction = false;
+
+    template<typename CellType, JSC::SubspaceAccess>
+    static JSC::GCClient::IsoSubspace* subspaceFor(JSC::VM& vm)
+    {
+        static_assert(sizeof(CellType) == sizeof(JSDOMConstructorBase));
+        STATIC_ASSERT_ISO_SUBSPACE_SHARABLE(CellType, JSDOMConstructorBase);
+        static_assert(CellType::destroy == JSC::JSCell::destroy, "JSDOMConstructor<JSClass> is not destructible actually");
+        return subspaceForImpl(vm);
+    }
+
+    static JSC::GCClient::IsoSubspace* subspaceForImpl(JSC::VM&);
+
+    JSDOMGlobalObject* globalObject() const { return JSC::jsCast<JSDOMGlobalObject*>(Base::globalObject()); }
+    // ScriptExecutionContext* scriptExecutionContext() const { return globalObject()->scriptExecutionContext(); }
+
+protected:
+    JSDOMConstructorBase(JSC::VM& vm, JSC::Structure* structure, JSC::NativeFunction functionForConstruct)
+        : Base(vm, structure,
+            functionForConstruct ? callThrowTypeErrorForJSDOMConstructor : callThrowTypeErrorForJSDOMConstructorNotConstructable,
+            functionForConstruct ? functionForConstruct : callThrowTypeErrorForJSDOMConstructorNotConstructable)
+    {
+    }
+};
+
+} // namespace WebCore
diff --git a/src/javascript/jsc/bindings/webcore/JSDOMConstructorNotCallable.h b/src/javascript/jsc/bindings/webcore/JSDOMConstructorNotCallable.h
new file mode 100644
index 000000000..da94a3f48
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/JSDOMConstructorNotCallable.h
@@ -0,0 +1,85 @@
+/*
+ * Copyright (C) 2021 Alexey Shvayka <shvaikalesh@gmail.com>
+ * Copyright (C) 2021-2022 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "JSDOMWrapper.h"
+#include "WebCoreJSClientData.h"
+
+namespace WebCore {
+
+template<typename JSClass> class JSDOMConstructorNotCallable : public JSDOMObject {
+public:
+    using Base = JSDOMObject;
+
+    static constexpr unsigned StructureFlags = Base::StructureFlags;
+    static constexpr bool needsDestruction = false;
+    static JSDOMConstructorNotCallable* create(JSC::VM&, JSC::Structure*, JSDOMGlobalObject&);
+    static JSC::Structure* createStructure(JSC::VM&, JSC::JSGlobalObject&, JSC::JSValue prototype);
+
+    DECLARE_INFO;
+
+    static JSC::JSValue prototypeForStructure(JSC::VM&, const JSDOMGlobalObject&);
+
+    template<typename CellType, JSC::SubspaceAccess>
+    static JSC::GCClient::IsoSubspace* subspaceFor(JSC::VM& vm)
+    {
+        static_assert(sizeof(CellType) == sizeof(JSDOMConstructorNotCallable));
+        STATIC_ASSERT_ISO_SUBSPACE_SHARABLE(CellType, JSDOMConstructorNotCallable);
+        static_assert(CellType::destroy == JSC::JSCell::destroy, "JSDOMConstructorNotCallable<JSClass> is not destructible actually");
+        return &static_cast<JSVMClientData*>(vm.clientData)->domNamespaceObjectSpace();
+    }
+
+private:
+    JSDOMConstructorNotCallable(JSC::Structure* structure, JSDOMGlobalObject& globalObject)
+        : Base(structure, globalObject)
+    {
+    }
+
+    void finishCreation(JSC::VM&, JSDOMGlobalObject&);
+    void initializeProperties(JSC::VM&, JSDOMGlobalObject&) {}
+};
+
+template<typename JSClass> inline JSDOMConstructorNotCallable<JSClass>* JSDOMConstructorNotCallable<JSClass>::create(JSC::VM& vm, JSC::Structure* structure, JSDOMGlobalObject& globalObject)
+{
+    JSDOMConstructorNotCallable* constructor = new (NotNull, JSC::allocateCell<JSDOMConstructorNotCallable>(vm)) JSDOMConstructorNotCallable(structure, globalObject);
+    constructor->finishCreation(vm, globalObject);
+    return constructor;
+}
+
+template<typename JSClass> inline JSC::Structure* JSDOMConstructorNotCallable<JSClass>::createStructure(JSC::VM& vm, JSC::JSGlobalObject& globalObject, JSC::JSValue prototype)
+{
+    return JSC::Structure::create(vm, &globalObject, prototype, JSC::TypeInfo(JSC::ObjectType, StructureFlags), info());
+}
+
+template<typename JSClass> inline void JSDOMConstructorNotCallable<JSClass>::finishCreation(JSC::VM& vm, JSDOMGlobalObject& globalObject)
+{
+    Base::finishCreation(vm);
+    ASSERT(inherits(vm, info()));
+    initializeProperties(vm, globalObject);
+}
+
+} // namespace WebCore
diff --git a/src/javascript/jsc/bindings/webcore/JSDOMConstructorNotConstructable.h b/src/javascript/jsc/bindings/webcore/JSDOMConstructorNotConstructable.h
new file mode 100644
index 000000000..55d4e7792
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/JSDOMConstructorNotConstructable.h
@@ -0,0 +1,69 @@
+/*
+ *  Copyright (C) 2015, 2016 Canon Inc. All rights reserved.
+ *  Copyright (C) 2016-2021 Apple Inc. All rights reserved.
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#pragma once
+
+#include "JSDOMConstructorBase.h"
+
+namespace WebCore {
+
+template<typename JSClass> class JSDOMConstructorNotConstructable final : public JSDOMConstructorBase {
+public:
+    using Base = JSDOMConstructorBase;
+
+    static JSDOMConstructorNotConstructable* create(JSC::VM&, JSC::Structure*, JSDOMGlobalObject&);
+    static JSC::Structure* createStructure(JSC::VM&, JSC::JSGlobalObject&, JSC::JSValue prototype);
+
+    DECLARE_INFO;
+
+    // Must be defined for each specialization class.
+    static JSC::JSValue prototypeForStructure(JSC::VM&, const JSDOMGlobalObject&);
+
+private:
+    JSDOMConstructorNotConstructable(JSC::VM& vm, JSC::Structure* structure)
+        : Base(vm, structure, nullptr)
+    {
+    }
+
+    void finishCreation(JSC::VM&, JSDOMGlobalObject&);
+
+    // Usually defined for each specialization class.
+    void initializeProperties(JSC::VM&, JSDOMGlobalObject&) {}
+};
+
+template<typename JSClass> inline JSDOMConstructorNotConstructable<JSClass>* JSDOMConstructorNotConstructable<JSClass>::create(JSC::VM& vm, JSC::Structure* structure, JSDOMGlobalObject& globalObject)
+{
+    JSDOMConstructorNotConstructable* constructor = new (NotNull, JSC::allocateCell<JSDOMConstructorNotConstructable>(vm)) JSDOMConstructorNotConstructable(vm, structure);
+    constructor->finishCreation(vm, globalObject);
+    return constructor;
+}
+
+template<typename JSClass> inline JSC::Structure* JSDOMConstructorNotConstructable<JSClass>::createStructure(JSC::VM& vm, JSC::JSGlobalObject& globalObject, JSC::JSValue prototype)
+{
+    return JSC::Structure::create(vm, &globalObject, prototype, JSC::TypeInfo(JSC::InternalFunctionType, StructureFlags), info());
+}
+
+template<typename JSClass> inline void JSDOMConstructorNotConstructable<JSClass>::finishCreation(JSC::VM& vm, JSDOMGlobalObject& globalObject)
+{
+    Base::finishCreation(vm);
+    ASSERT(inherits(vm, info()));
+    initializeProperties(vm, globalObject);
+}
+
+} // namespace WebCore
diff --git a/src/javascript/jsc/bindings/webcore/JSDOMConvert.h b/src/javascript/jsc/bindings/webcore/JSDOMConvert.h
new file mode 100644
index 000000000..91cd5602c
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/JSDOMConvert.h
@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2016 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "JSDOMConvertAny.h"
+#include "JSDOMConvertBoolean.h"
+#include "JSDOMConvertBufferSource.h"
+#include "JSDOMConvertCallbacks.h"
+#include "JSDOMConvertDate.h"
+#include "JSDOMConvertDictionary.h"
+#include "JSDOMConvertEnumeration.h"
+#include "JSDOMConvertEventListener.h"
+#include "JSDOMConvertInterface.h"
+#include "JSDOMConvertJSON.h"
+#include "JSDOMConvertNull.h"
+#include "JSDOMConvertNullable.h"
+#include "JSDOMConvertNumbers.h"
+#include "JSDOMConvertObject.h"
+#include "JSDOMConvertRecord.h"
+#include "JSDOMConvertSequences.h"
+#include "JSDOMConvertSerializedScriptValue.h"
+#include "JSDOMConvertStrings.h"
+#include "JSDOMConvertUnion.h"
+#include "JSDOMConvertWebGL.h"
diff --git a/src/javascript/jsc/bindings/webcore/JSDOMConvertAny.h b/src/javascript/jsc/bindings/webcore/JSDOMConvertAny.h
new file mode 100644
index 000000000..b744bbb89
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/JSDOMConvertAny.h
@@ -0,0 +1,85 @@
+/*
+ * Copyright (C) 2016 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "IDLTypes.h"
+#include "JSDOMConvertBase.h"
+#include "JSValueInWrappedObject.h"
+
+namespace WebCore {
+
+template<> struct Converter<IDLAny> : DefaultConverter<IDLAny> {
+    using ReturnType = JSC::JSValue;
+
+    static constexpr bool conversionHasSideEffects = false;
+
+    static JSC::JSValue convert(JSC::JSGlobalObject&, JSC::JSValue value)
+    {
+        return value;
+    }
+
+    static JSC::JSValue convert(const JSC::Strong<JSC::Unknown>& value)
+    {
+        return value.get();
+    }
+};
+
+template<> struct JSConverter<IDLAny> {
+    static constexpr bool needsState = false;
+    static constexpr bool needsGlobalObject = false;
+
+    static JSC::JSValue convert(const JSC::JSValue& value)
+    {
+        return value;
+    }
+
+    static JSC::JSValue convert(const JSC::Strong<JSC::Unknown>& value)
+    {
+        return value.get();
+    }
+
+    static JSC::JSValue convert(const JSValueInWrappedObject& value)
+    {
+        return value.getValue();
+    }
+};
+
+template<> struct VariadicConverter<IDLAny> {
+    using Item = typename IDLAny::ImplementationType;
+
+    static std::optional<Item> convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+    {
+        auto& vm = JSC::getVM(&lexicalGlobalObject);
+        auto scope = DECLARE_THROW_SCOPE(vm);
+
+        auto result = Converter<IDLAny>::convert(lexicalGlobalObject, value);
+        RETURN_IF_EXCEPTION(scope, std::nullopt);
+
+        return Item { vm, result };
+    }
+};
+
+} // namespace WebCore
diff --git a/src/javascript/jsc/bindings/webcore/JSDOMConvertBase.h b/src/javascript/jsc/bindings/webcore/JSDOMConvertBase.h
new file mode 100644
index 000000000..928e79b99
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/JSDOMConvertBase.h
@@ -0,0 +1,268 @@
+/*
+ * Copyright (C) 2016 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+#include "root.h"
+#include "ZigGlobalObject.h"
+
+#include "JSDOMExceptionHandling.h"
+#include "JavaScriptCore/Error.h"
+
+namespace WebCore {
+
+// Conversion from JSValue -> Implementation
+template<typename T> struct Converter;
+
+namespace Detail {
+
+template<typename T> inline T* getPtrOrRef(const T* p) { return const_cast<T*>(p); }
+template<typename T> inline T& getPtrOrRef(const T& p) { return const_cast<T&>(p); }
+template<typename T> inline T* getPtrOrRef(const RefPtr<T>& p) { return p.get(); }
+template<typename T> inline T& getPtrOrRef(const Ref<T>& p) { return p.get(); }
+
+}
+
+struct DefaultExceptionThrower {
+    void operator()(JSC::JSGlobalObject& lexicalGlobalObject, JSC::ThrowScope& scope)
+    {
+        throwTypeError(&lexicalGlobalObject, scope);
+    }
+};
+
+template<typename T> typename Converter<T>::ReturnType convert(JSC::JSGlobalObject&, JSC::JSValue);
+template<typename T> typename Converter<T>::ReturnType convert(JSC::JSGlobalObject&, JSC::JSValue, JSC::JSObject&);
+template<typename T> typename Converter<T>::ReturnType convert(JSC::JSGlobalObject&, JSC::JSValue, JSDOMGlobalObject&);
+template<typename T, typename ExceptionThrower> typename Converter<T>::ReturnType convert(JSC::JSGlobalObject&, JSC::JSValue, ExceptionThrower&&);
+template<typename T, typename ExceptionThrower> typename Converter<T>::ReturnType convert(JSC::JSGlobalObject&, JSC::JSValue, JSC::JSObject&, ExceptionThrower&&);
+template<typename T, typename ExceptionThrower> typename Converter<T>::ReturnType convert(JSC::JSGlobalObject&, JSC::JSValue, JSDOMGlobalObject&, ExceptionThrower&&);
+
+template<typename T> inline typename Converter<T>::ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+{
+    return Converter<T>::convert(lexicalGlobalObject, value);
+}
+
+template<typename T> inline typename Converter<T>::ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value, JSC::JSObject& thisObject)
+{
+    return Converter<T>::convert(lexicalGlobalObject, value, thisObject);
+}
+
+template<typename T> inline typename Converter<T>::ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value, JSDOMGlobalObject& globalObject)
+{
+    return Converter<T>::convert(lexicalGlobalObject, value, globalObject);
+}
+
+template<typename T, typename ExceptionThrower> inline typename Converter<T>::ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value, ExceptionThrower&& exceptionThrower)
+{
+    return Converter<T>::convert(lexicalGlobalObject, value, std::forward<ExceptionThrower>(exceptionThrower));
+}
+
+template<typename T, typename ExceptionThrower> inline typename Converter<T>::ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value, JSC::JSObject& thisObject, ExceptionThrower&& exceptionThrower)
+{
+    return Converter<T>::convert(lexicalGlobalObject, value, thisObject, std::forward<ExceptionThrower>(exceptionThrower));
+}
+
+template<typename T, typename ExceptionThrower> inline typename Converter<T>::ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value, JSDOMGlobalObject& globalObject, ExceptionThrower&& exceptionThrower)
+{
+    return Converter<T>::convert(lexicalGlobalObject, value, globalObject, std::forward<ExceptionThrower>(exceptionThrower));
+}
+
+// Conversion from Implementation -> JSValue
+template<typename T> struct JSConverter;
+
+template<typename T, typename U> inline JSC::JSValue toJS(U&&);
+template<typename T, typename U> inline JSC::JSValue toJS(JSC::JSGlobalObject&, U&&);
+template<typename T, typename U> inline JSC::JSValue toJS(JSC::JSGlobalObject&, JSDOMGlobalObject&, U&&);
+template<typename T, typename U> inline JSC::JSValue toJSNewlyCreated(JSC::JSGlobalObject&, JSDOMGlobalObject&, U&&);
+
+template<typename T, typename U> inline JSC::JSValue toJS(JSC::JSGlobalObject&, JSC::ThrowScope&, U&& valueOrFunctor);
+template<typename T, typename U> inline JSC::JSValue toJS(JSC::JSGlobalObject&, JSDOMGlobalObject&, JSC::ThrowScope&, U&& valueOrFunctor);
+template<typename T, typename U> inline JSC::JSValue toJSNewlyCreated(JSC::JSGlobalObject&, JSDOMGlobalObject&, JSC::ThrowScope&, U&& valueOrFunctor);
+
+template<typename T, bool needsState = JSConverter<T>::needsState, bool needsGlobalObject = JSConverter<T>::needsGlobalObject>
+struct JSConverterOverloader;
+
+template<typename T>
+struct JSConverterOverloader<T, true, true> {
+    template<typename U> static JSC::JSValue convert(JSC::JSGlobalObject& lexicalGlobalObject, JSDOMGlobalObject& globalObject, U&& value)
+    {
+        return JSConverter<T>::convert(lexicalGlobalObject, globalObject, std::forward<U>(value));
+    }
+};
+
+template<typename T>
+struct JSConverterOverloader<T, true, false> {
+    template<typename U> static JSC::JSValue convert(JSC::JSGlobalObject& lexicalGlobalObject, U&& value)
+    {
+        return JSConverter<T>::convert(lexicalGlobalObject, std::forward<U>(value));
+    }
+
+    template<typename U> static JSC::JSValue convert(JSC::JSGlobalObject& lexicalGlobalObject, JSDOMGlobalObject&, U&& value)
+    {
+        return JSConverter<T>::convert(lexicalGlobalObject, std::forward<U>(value));
+    }
+};
+
+template<typename T>
+struct JSConverterOverloader<T, false, false> {
+    template<typename U> static JSC::JSValue convert(JSC::JSGlobalObject&, U&& value)
+    {
+        return JSConverter<T>::convert(std::forward<U>(value));
+    }
+
+    template<typename U> static JSC::JSValue convert(JSC::JSGlobalObject&, JSDOMGlobalObject&, U&& value)
+    {
+        return JSConverter<T>::convert(std::forward<U>(value));
+    }
+};
+
+template<typename T, typename U> inline JSC::JSValue toJS(U&& value)
+{
+    return JSConverter<T>::convert(std::forward<U>(value));
+}
+
+template<typename T, typename U> inline JSC::JSValue toJS(JSC::JSGlobalObject& lexicalGlobalObject, U&& value)
+{
+    return JSConverterOverloader<T>::convert(lexicalGlobalObject, std::forward<U>(value));
+}
+
+template<typename T, typename U> inline JSC::JSValue toJS(JSC::JSGlobalObject& lexicalGlobalObject, JSDOMGlobalObject& globalObject, U&& value)
+{
+    return JSConverterOverloader<T>::convert(lexicalGlobalObject, globalObject, std::forward<U>(value));
+}
+
+template<typename T, typename U> inline JSC::JSValue toJSNewlyCreated(JSC::JSGlobalObject& lexicalGlobalObject, JSDOMGlobalObject& globalObject, U&& value)
+{
+    return JSConverter<T>::convertNewlyCreated(lexicalGlobalObject, globalObject, std::forward<U>(value));
+}
+
+template<typename T, typename U> inline JSC::JSValue toJS(JSC::JSGlobalObject& lexicalGlobalObject, JSC::ThrowScope& throwScope, U&& valueOrFunctor)
+{
+    if constexpr (std::is_invocable_v<U>) {
+        using FunctorReturnType = std::invoke_result_t<U>;
+
+        if constexpr (std::is_same_v<void, FunctorReturnType>) {
+            valueOrFunctor();
+            return JSC::jsUndefined();
+        } else if constexpr (std::is_same_v<ExceptionOr<void>, FunctorReturnType>) {
+            auto result = valueOrFunctor();
+            if (UNLIKELY(result.hasException())) {
+                propagateException(lexicalGlobalObject, throwScope, result.releaseException());
+                return {};
+            }
+            return JSC::jsUndefined();
+        } else
+            return toJS<T>(lexicalGlobalObject, throwScope, valueOrFunctor());
+    } else {
+        if constexpr (IsExceptionOr<U>) {
+            if (UNLIKELY(valueOrFunctor.hasException())) {
+                propagateException(lexicalGlobalObject, throwScope, valueOrFunctor.releaseException());
+                return {};
+            }
+
+            return toJS<T>(lexicalGlobalObject, valueOrFunctor.releaseReturnValue());
+        } else
+            return toJS<T>(lexicalGlobalObject, std::forward<U>(valueOrFunctor));
+    }
+}
+
+template<typename T, typename U> inline JSC::JSValue toJS(JSC::JSGlobalObject& lexicalGlobalObject, JSDOMGlobalObject& globalObject, JSC::ThrowScope& throwScope, U&& valueOrFunctor)
+{
+    if constexpr (std::is_invocable_v<U>) {
+        using FunctorReturnType = std::invoke_result_t<U>;
+
+        if constexpr (std::is_same_v<void, FunctorReturnType>) {
+            valueOrFunctor();
+            return JSC::jsUndefined();
+        } else if constexpr (std::is_same_v<ExceptionOr<void>, FunctorReturnType>) {
+            auto result = valueOrFunctor();
+            if (UNLIKELY(result.hasException())) {
+                propagateException(lexicalGlobalObject, throwScope, result.releaseException());
+                return {};
+            }
+            return JSC::jsUndefined();
+        } else
+            return toJS<T>(lexicalGlobalObject, globalObject, throwScope, valueOrFunctor());
+    } else {
+        if constexpr (IsExceptionOr<U>) {
+            if (UNLIKELY(valueOrFunctor.hasException())) {
+                propagateException(lexicalGlobalObject, throwScope, valueOrFunctor.releaseException());
+                return {};
+            }
+
+            return toJS<T>(lexicalGlobalObject, globalObject, valueOrFunctor.releaseReturnValue());
+        } else
+            return toJS<T>(lexicalGlobalObject, globalObject, std::forward<U>(valueOrFunctor));
+    }
+}
+
+template<typename T, typename U> inline JSC::JSValue toJSNewlyCreated(JSC::JSGlobalObject& lexicalGlobalObject, JSDOMGlobalObject& globalObject, JSC::ThrowScope& throwScope, U&& valueOrFunctor)
+{
+    if constexpr (std::is_invocable_v<U>) {
+        using FunctorReturnType = std::invoke_result_t<U>;
+
+        if constexpr (std::is_same_v<void, FunctorReturnType>) {
+            valueOrFunctor();
+            return JSC::jsUndefined();
+        } else if constexpr (std::is_same_v<ExceptionOr<void>, FunctorReturnType>) {
+            auto result = valueOrFunctor();
+            if (UNLIKELY(result.hasException())) {
+                propagateException(lexicalGlobalObject, throwScope, result.releaseException());
+                return {};
+            }
+            return JSC::jsUndefined();
+        } else
+            return toJSNewlyCreated<T>(lexicalGlobalObject, globalObject, throwScope, valueOrFunctor());
+
+    } else {
+        if constexpr (IsExceptionOr<U>) {
+            if (UNLIKELY(valueOrFunctor.hasException())) {
+                propagateException(lexicalGlobalObject, throwScope, valueOrFunctor.releaseException());
+                return {};
+            }
+
+            return toJSNewlyCreated<T>(lexicalGlobalObject, globalObject, valueOrFunctor.releaseReturnValue());
+        } else
+            return toJSNewlyCreated<T>(lexicalGlobalObject, globalObject, std::forward<U>(valueOrFunctor));
+    }
+}
+
+template<typename T> struct DefaultConverter {
+    using ReturnType = typename T::ImplementationType;
+
+    // We assume the worst, subtypes can override to be less pessimistic.
+    // An example of something that can have side effects
+    // is having a converter that does JSC::JSValue::toNumber.
+    // toNumber() in JavaScript can call arbitrary JS functions.
+    //
+    // An example of something that does not have side effects
+    // is something having a converter that does JSC::JSValue::toBoolean.
+    // toBoolean() in JS can't call arbitrary functions.
+    static constexpr bool conversionHasSideEffects = true;
+};
+
+// Conversion from JSValue -> Implementation for variadic arguments
+template<typename IDLType> struct VariadicConverter;
+
+} // namespace WebCore
diff --git a/src/javascript/jsc/bindings/webcore/JSDOMConvertBoolean.h b/src/javascript/jsc/bindings/webcore/JSDOMConvertBoolean.h
new file mode 100644
index 000000000..ed8ea5211
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/JSDOMConvertBoolean.h
@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2016 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "IDLTypes.h"
+#include "JSDOMConvertBase.h"
+
+namespace WebCore {
+
+template<> struct Converter<IDLBoolean> : DefaultConverter<IDLBoolean> {
+
+    static constexpr bool conversionHasSideEffects = false;
+
+    static bool convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+    {
+        return value.toBoolean(&lexicalGlobalObject);
+    }
+};
+
+template<> struct JSConverter<IDLBoolean> {
+    static constexpr bool needsState = false;
+    static constexpr bool needsGlobalObject = false;
+
+    static JSC::JSValue convert(bool value)
+    {
+        return JSC::jsBoolean(value);
+    }
+};
+
+} // namespace WebCore
diff --git a/src/javascript/jsc/bindings/webcore/JSDOMConvertBufferSource.h b/src/javascript/jsc/bindings/webcore/JSDOMConvertBufferSource.h
new file mode 100644
index 000000000..7cc629ab8
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/JSDOMConvertBufferSource.h
@@ -0,0 +1,481 @@
+/*
+ * Copyright (C) 2016 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "BufferSource.h"
+#include "IDLTypes.h"
+#include "JSDOMConvertBase.h"
+#include "JSDOMWrapperCache.h"
+#include "JavaScriptCore/JSTypedArrays.h"
+
+namespace WebCore {
+
+struct IDLInt8Array : IDLTypedArray<JSC::Int8Array> {
+};
+struct IDLInt16Array : IDLTypedArray<JSC::Int16Array> {
+};
+struct IDLInt32Array : IDLTypedArray<JSC::Int32Array> {
+};
+struct IDLUint8Array : IDLTypedArray<JSC::Uint8Array> {
+};
+struct IDLUint16Array : IDLTypedArray<JSC::Uint16Array> {
+};
+struct IDLUint32Array : IDLTypedArray<JSC::Uint32Array> {
+};
+struct IDLUint8ClampedArray : IDLTypedArray<JSC::Uint8ClampedArray> {
+};
+struct IDLFloat32Array : IDLTypedArray<JSC::Float32Array> {
+};
+struct IDLFloat64Array : IDLTypedArray<JSC::Float64Array> {
+};
+struct IDLBigInt64Array : IDLTypedArray<JSC::BigInt64Array> {
+};
+struct IDLBigUint64Array : IDLTypedArray<JSC::BigUint64Array> {
+};
+
+inline RefPtr<JSC::Int8Array> toPossiblySharedInt8Array(JSC::VM& vm, JSC::JSValue value) { return JSC::toPossiblySharedNativeTypedView<JSC::Int8Adaptor>(vm, value); }
+inline RefPtr<JSC::Int16Array> toPossiblySharedInt16Array(JSC::VM& vm, JSC::JSValue value) { return JSC::toPossiblySharedNativeTypedView<JSC::Int16Adaptor>(vm, value); }
+inline RefPtr<JSC::Int32Array> toPossiblySharedInt32Array(JSC::VM& vm, JSC::JSValue value) { return JSC::toPossiblySharedNativeTypedView<JSC::Int32Adaptor>(vm, value); }
+inline RefPtr<JSC::Uint8Array> toPossiblySharedUint8Array(JSC::VM& vm, JSC::JSValue value) { return JSC::toPossiblySharedNativeTypedView<JSC::Uint8Adaptor>(vm, value); }
+inline RefPtr<JSC::Uint8ClampedArray> toPossiblySharedUint8ClampedArray(JSC::VM& vm, JSC::JSValue value) { return JSC::toPossiblySharedNativeTypedView<JSC::Uint8ClampedAdaptor>(vm, value); }
+inline RefPtr<JSC::Uint16Array> toPossiblySharedUint16Array(JSC::VM& vm, JSC::JSValue value) { return JSC::toPossiblySharedNativeTypedView<JSC::Uint16Adaptor>(vm, value); }
+inline RefPtr<JSC::Uint32Array> toPossiblySharedUint32Array(JSC::VM& vm, JSC::JSValue value) { return JSC::toPossiblySharedNativeTypedView<JSC::Uint32Adaptor>(vm, value); }
+inline RefPtr<JSC::Float32Array> toPossiblySharedFloat32Array(JSC::VM& vm, JSC::JSValue value) { return JSC::toPossiblySharedNativeTypedView<JSC::Float32Adaptor>(vm, value); }
+inline RefPtr<JSC::Float64Array> toPossiblySharedFloat64Array(JSC::VM& vm, JSC::JSValue value) { return JSC::toPossiblySharedNativeTypedView<JSC::Float64Adaptor>(vm, value); }
+inline RefPtr<JSC::BigInt64Array> toPossiblySharedBigInt64Array(JSC::VM& vm, JSC::JSValue value) { return JSC::toPossiblySharedNativeTypedView<JSC::BigInt64Adaptor>(vm, value); }
+inline RefPtr<JSC::BigUint64Array> toPossiblySharedBigUint64Array(JSC::VM& vm, JSC::JSValue value) { return JSC::toPossiblySharedNativeTypedView<JSC::BigUint64Adaptor>(vm, value); }
+
+inline RefPtr<JSC::Int8Array> toUnsharedInt8Array(JSC::VM& vm, JSC::JSValue value) { return JSC::toUnsharedNativeTypedView<JSC::Int8Adaptor>(vm, value); }
+inline RefPtr<JSC::Int16Array> toUnsharedInt16Array(JSC::VM& vm, JSC::JSValue value) { return JSC::toUnsharedNativeTypedView<JSC::Int16Adaptor>(vm, value); }
+inline RefPtr<JSC::Int32Array> toUnsharedInt32Array(JSC::VM& vm, JSC::JSValue value) { return JSC::toUnsharedNativeTypedView<JSC::Int32Adaptor>(vm, value); }
+inline RefPtr<JSC::Uint8Array> toUnsharedUint8Array(JSC::VM& vm, JSC::JSValue value) { return JSC::toUnsharedNativeTypedView<JSC::Uint8Adaptor>(vm, value); }
+inline RefPtr<JSC::Uint8ClampedArray> toUnsharedUint8ClampedArray(JSC::VM& vm, JSC::JSValue value) { return JSC::toUnsharedNativeTypedView<JSC::Uint8ClampedAdaptor>(vm, value); }
+inline RefPtr<JSC::Uint16Array> toUnsharedUint16Array(JSC::VM& vm, JSC::JSValue value) { return JSC::toUnsharedNativeTypedView<JSC::Uint16Adaptor>(vm, value); }
+inline RefPtr<JSC::Uint32Array> toUnsharedUint32Array(JSC::VM& vm, JSC::JSValue value) { return JSC::toUnsharedNativeTypedView<JSC::Uint32Adaptor>(vm, value); }
+inline RefPtr<JSC::Float32Array> toUnsharedFloat32Array(JSC::VM& vm, JSC::JSValue value) { return JSC::toUnsharedNativeTypedView<JSC::Float32Adaptor>(vm, value); }
+inline RefPtr<JSC::Float64Array> toUnsharedFloat64Array(JSC::VM& vm, JSC::JSValue value) { return JSC::toUnsharedNativeTypedView<JSC::Float64Adaptor>(vm, value); }
+inline RefPtr<JSC::BigInt64Array> toUnsharedBigInt64Array(JSC::VM& vm, JSC::JSValue value) { return JSC::toUnsharedNativeTypedView<JSC::BigInt64Adaptor>(vm, value); }
+inline RefPtr<JSC::BigUint64Array> toUnsharedBigUint64Array(JSC::VM& vm, JSC::JSValue value) { return JSC::toUnsharedNativeTypedView<JSC::BigUint64Adaptor>(vm, value); }
+
+inline JSC::JSValue toJS(JSC::JSGlobalObject* lexicalGlobalObject, JSDOMGlobalObject* globalObject, JSC::ArrayBuffer& buffer)
+{
+    if (auto result = getCachedWrapper(globalObject->world(), buffer))
+        return result;
+
+    // The JSArrayBuffer::create function will register the wrapper in finishCreation.
+    return JSC::JSArrayBuffer::create(JSC::getVM(lexicalGlobalObject), globalObject->arrayBufferStructure(buffer.sharingMode()), &buffer);
+}
+
+inline JSC::JSValue toJS(JSC::JSGlobalObject* lexicalGlobalObject, JSC::JSGlobalObject* globalObject, JSC::ArrayBufferView& view)
+{
+    return view.wrap(lexicalGlobalObject, globalObject);
+}
+
+inline JSC::JSValue toJS(JSC::JSGlobalObject* lexicalGlobalObject, JSDOMGlobalObject* globalObject, JSC::ArrayBuffer* buffer)
+{
+    if (!buffer)
+        return JSC::jsNull();
+    return toJS(lexicalGlobalObject, globalObject, *buffer);
+}
+
+inline JSC::JSValue toJS(JSC::JSGlobalObject* lexicalGlobalObject, JSC::JSGlobalObject* globalObject, JSC::ArrayBufferView* view)
+{
+    if (!view)
+        return JSC::jsNull();
+    return toJS(lexicalGlobalObject, globalObject, *view);
+}
+
+inline RefPtr<JSC::ArrayBufferView> toPossiblySharedArrayBufferView(JSC::VM& vm, JSC::JSValue value)
+{
+    auto* wrapper = JSC::jsDynamicCast<JSC::JSArrayBufferView*>(vm, value);
+    if (!wrapper)
+        return nullptr;
+    return wrapper->possiblySharedImpl();
+}
+
+inline RefPtr<JSC::ArrayBufferView> toUnsharedArrayBufferView(JSC::VM& vm, JSC::JSValue value)
+{
+    auto result = toPossiblySharedArrayBufferView(vm, value);
+    if (!result || result->isShared())
+        return nullptr;
+    return result;
+}
+
+namespace Detail {
+
+enum class BufferSourceConverterAllowSharedMode { Allow,
+    Disallow };
+template<typename BufferSourceType, BufferSourceConverterAllowSharedMode mode>
+struct BufferSourceConverter {
+    using WrapperType = typename Converter<BufferSourceType>::WrapperType;
+    using ReturnType = typename Converter<BufferSourceType>::ReturnType;
+
+    template<typename ExceptionThrower = DefaultExceptionThrower>
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value, ExceptionThrower&& exceptionThrower = ExceptionThrower())
+    {
+        auto& vm = JSC::getVM(&lexicalGlobalObject);
+        auto scope = DECLARE_THROW_SCOPE(vm);
+        ReturnType object {};
+        if constexpr (mode == BufferSourceConverterAllowSharedMode::Allow)
+            object = WrapperType::toWrappedAllowShared(vm, value);
+        else
+            object = WrapperType::toWrapped(vm, value);
+        if (UNLIKELY(!object))
+            exceptionThrower(lexicalGlobalObject, scope);
+        return object;
+    }
+};
+
+}
+
+template<> struct Converter<IDLArrayBuffer> : DefaultConverter<IDLArrayBuffer> {
+    using WrapperType = JSC::JSArrayBuffer;
+    using ReturnType = JSC::ArrayBuffer*;
+
+    template<typename ExceptionThrower = DefaultExceptionThrower>
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value, ExceptionThrower&& exceptionThrower = ExceptionThrower())
+    {
+        return Detail::BufferSourceConverter<IDLArrayBuffer, Detail::BufferSourceConverterAllowSharedMode::Disallow>::convert(lexicalGlobalObject, value, std::forward<ExceptionThrower>(exceptionThrower));
+    }
+};
+
+template<> struct JSConverter<IDLArrayBuffer> {
+    static constexpr bool needsState = true;
+    static constexpr bool needsGlobalObject = true;
+
+    template<typename U>
+    static JSC::JSValue convert(JSC::JSGlobalObject& lexicalGlobalObject, JSDOMGlobalObject& globalObject, const U& value)
+    {
+        return toJS(&lexicalGlobalObject, &globalObject, Detail::getPtrOrRef(value));
+    }
+};
+
+template<> struct Converter<IDLDataView> : DefaultConverter<IDLDataView> {
+    using WrapperType = JSC::JSDataView;
+    using ReturnType = RefPtr<JSC::DataView>;
+
+    template<typename ExceptionThrower = DefaultExceptionThrower>
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value, ExceptionThrower&& exceptionThrower = ExceptionThrower())
+    {
+        return Detail::BufferSourceConverter<IDLDataView, Detail::BufferSourceConverterAllowSharedMode::Disallow>::convert(lexicalGlobalObject, value, std::forward<ExceptionThrower>(exceptionThrower));
+    }
+};
+
+template<> struct JSConverter<IDLDataView> {
+    static constexpr bool needsState = true;
+    static constexpr bool needsGlobalObject = true;
+
+    template<typename U>
+    static JSC::JSValue convert(JSC::JSGlobalObject& lexicalGlobalObject, JSDOMGlobalObject& globalObject, const U& value)
+    {
+        return toJS(&lexicalGlobalObject, &globalObject, Detail::getPtrOrRef(value));
+    }
+};
+
+template<> struct Converter<IDLInt8Array> : DefaultConverter<IDLInt8Array> {
+    using WrapperType = JSC::JSInt8Array;
+    using ReturnType = RefPtr<JSC::Int8Array>;
+
+    template<typename ExceptionThrower = DefaultExceptionThrower>
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value, ExceptionThrower&& exceptionThrower = ExceptionThrower())
+    {
+        return Detail::BufferSourceConverter<IDLInt8Array, Detail::BufferSourceConverterAllowSharedMode::Disallow>::convert(lexicalGlobalObject, value, std::forward<ExceptionThrower>(exceptionThrower));
+    }
+};
+
+template<> struct JSConverter<IDLInt8Array> {
+    static constexpr bool needsState = true;
+    static constexpr bool needsGlobalObject = true;
+
+    template<typename U>
+    static JSC::JSValue convert(JSC::JSGlobalObject& lexicalGlobalObject, JSDOMGlobalObject& globalObject, const U& value)
+    {
+        return toJS(&lexicalGlobalObject, &globalObject, Detail::getPtrOrRef(value));
+    }
+};
+
+template<> struct Converter<IDLInt16Array> : DefaultConverter<IDLInt16Array> {
+    using WrapperType = JSC::JSInt16Array;
+    using ReturnType = RefPtr<JSC::Int16Array>;
+
+    template<typename ExceptionThrower = DefaultExceptionThrower>
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value, ExceptionThrower&& exceptionThrower = ExceptionThrower())
+    {
+        return Detail::BufferSourceConverter<IDLInt16Array, Detail::BufferSourceConverterAllowSharedMode::Disallow>::convert(lexicalGlobalObject, value, std::forward<ExceptionThrower>(exceptionThrower));
+    }
+};
+
+template<> struct JSConverter<IDLInt16Array> {
+    static constexpr bool needsState = true;
+    static constexpr bool needsGlobalObject = true;
+
+    template<typename U>
+    static JSC::JSValue convert(JSC::JSGlobalObject& lexicalGlobalObject, JSDOMGlobalObject& globalObject, const U& value)
+    {
+        return toJS(&lexicalGlobalObject, &globalObject, Detail::getPtrOrRef(value));
+    }
+};
+
+template<> struct Converter<IDLInt32Array> : DefaultConverter<IDLInt32Array> {
+    using WrapperType = JSC::JSInt32Array;
+    using ReturnType = RefPtr<JSC::Int32Array>;
+
+    template<typename ExceptionThrower = DefaultExceptionThrower>
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value, ExceptionThrower&& exceptionThrower = ExceptionThrower())
+    {
+        return Detail::BufferSourceConverter<IDLInt32Array, Detail::BufferSourceConverterAllowSharedMode::Disallow>::convert(lexicalGlobalObject, value, std::forward<ExceptionThrower>(exceptionThrower));
+    }
+};
+
+template<> struct JSConverter<IDLInt32Array> {
+    static constexpr bool needsState = true;
+    static constexpr bool needsGlobalObject = true;
+
+    template<typename U>
+    static JSC::JSValue convert(JSC::JSGlobalObject& lexicalGlobalObject, JSDOMGlobalObject& globalObject, const U& value)
+    {
+        return toJS(&lexicalGlobalObject, &globalObject, Detail::getPtrOrRef(value));
+    }
+};
+
+template<> struct Converter<IDLUint8Array> : DefaultConverter<IDLUint8Array> {
+    using WrapperType = JSC::JSUint8Array;
+    using ReturnType = RefPtr<JSC::Uint8Array>;
+
+    template<typename ExceptionThrower = DefaultExceptionThrower>
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value, ExceptionThrower&& exceptionThrower = ExceptionThrower())
+    {
+        return Detail::BufferSourceConverter<IDLUint8Array, Detail::BufferSourceConverterAllowSharedMode::Disallow>::convert(lexicalGlobalObject, value, std::forward<ExceptionThrower>(exceptionThrower));
+    }
+};
+
+template<> struct JSConverter<IDLUint8Array> {
+    static constexpr bool needsState = true;
+    static constexpr bool needsGlobalObject = true;
+
+    template<typename U>
+    static JSC::JSValue convert(JSC::JSGlobalObject& lexicalGlobalObject, JSDOMGlobalObject& globalObject, const U& value)
+    {
+        return toJS(&lexicalGlobalObject, &globalObject, Detail::getPtrOrRef(value));
+    }
+
+    template<typename U>
+    static JSC::JSValue convertNewlyCreated(JSC::JSGlobalObject& lexicalGlobalObject, JSDOMGlobalObject& globalObject, U&& value)
+    {
+        return convert(lexicalGlobalObject, globalObject, std::forward<U>(value));
+    }
+};
+
+template<> struct Converter<IDLUint16Array> : DefaultConverter<IDLUint16Array> {
+    using WrapperType = JSC::JSUint16Array;
+    using ReturnType = RefPtr<JSC::Uint16Array>;
+
+    template<typename ExceptionThrower = DefaultExceptionThrower>
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value, ExceptionThrower&& exceptionThrower = ExceptionThrower())
+    {
+        return Detail::BufferSourceConverter<IDLUint16Array, Detail::BufferSourceConverterAllowSharedMode::Disallow>::convert(lexicalGlobalObject, value, std::forward<ExceptionThrower>(exceptionThrower));
+    }
+};
+
+template<> struct JSConverter<IDLUint16Array> {
+    static constexpr bool needsState = true;
+    static constexpr bool needsGlobalObject = true;
+
+    template<typename U>
+    static JSC::JSValue convert(JSC::JSGlobalObject& lexicalGlobalObject, JSDOMGlobalObject& globalObject, const U& value)
+    {
+        return toJS(&lexicalGlobalObject, &globalObject, Detail::getPtrOrRef(value));
+    }
+};
+
+template<> struct Converter<IDLUint32Array> : DefaultConverter<IDLUint32Array> {
+    using WrapperType = JSC::JSUint32Array;
+    using ReturnType = RefPtr<JSC::Uint32Array>;
+
+    template<typename ExceptionThrower = DefaultExceptionThrower>
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value, ExceptionThrower&& exceptionThrower = ExceptionThrower())
+    {
+        return Detail::BufferSourceConverter<IDLUint32Array, Detail::BufferSourceConverterAllowSharedMode::Disallow>::convert(lexicalGlobalObject, value, std::forward<ExceptionThrower>(exceptionThrower));
+    }
+};
+
+template<> struct JSConverter<IDLUint32Array> {
+    static constexpr bool needsState = true;
+    static constexpr bool needsGlobalObject = true;
+
+    template<typename U>
+    static JSC::JSValue convert(JSC::JSGlobalObject& lexicalGlobalObject, JSDOMGlobalObject& globalObject, const U& value)
+    {
+        return toJS(&lexicalGlobalObject, &globalObject, Detail::getPtrOrRef(value));
+    }
+};
+
+template<> struct Converter<IDLUint8ClampedArray> : DefaultConverter<IDLUint8ClampedArray> {
+    using WrapperType = JSC::JSUint8ClampedArray;
+    using ReturnType = RefPtr<JSC::Uint8ClampedArray>;
+
+    template<typename ExceptionThrower = DefaultExceptionThrower>
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value, ExceptionThrower&& exceptionThrower = ExceptionThrower())
+    {
+        return Detail::BufferSourceConverter<IDLUint8ClampedArray, Detail::BufferSourceConverterAllowSharedMode::Disallow>::convert(lexicalGlobalObject, value, std::forward<ExceptionThrower>(exceptionThrower));
+    }
+};
+
+template<> struct JSConverter<IDLUint8ClampedArray> {
+    static constexpr bool needsState = true;
+    static constexpr bool needsGlobalObject = true;
+
+    template<typename U>
+    static JSC::JSValue convert(JSC::JSGlobalObject& lexicalGlobalObject, JSDOMGlobalObject& globalObject, const U& value)
+    {
+        return toJS(&lexicalGlobalObject, &globalObject, Detail::getPtrOrRef(value));
+    }
+};
+
+template<> struct Converter<IDLFloat32Array> : DefaultConverter<IDLFloat32Array> {
+    using WrapperType = JSC::JSFloat32Array;
+    using ReturnType = RefPtr<JSC::Float32Array>;
+
+    template<typename ExceptionThrower = DefaultExceptionThrower>
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value, ExceptionThrower&& exceptionThrower = ExceptionThrower())
+    {
+        return Detail::BufferSourceConverter<IDLFloat32Array, Detail::BufferSourceConverterAllowSharedMode::Disallow>::convert(lexicalGlobalObject, value, std::forward<ExceptionThrower>(exceptionThrower));
+    }
+};
+
+template<> struct JSConverter<IDLFloat32Array> {
+    static constexpr bool needsState = true;
+    static constexpr bool needsGlobalObject = true;
+
+    template<typename U>
+    static JSC::JSValue convert(JSC::JSGlobalObject& lexicalGlobalObject, JSDOMGlobalObject& globalObject, const U& value)
+    {
+        return toJS(&lexicalGlobalObject, &globalObject, Detail::getPtrOrRef(value));
+    }
+};
+
+template<> struct Converter<IDLFloat64Array> : DefaultConverter<IDLFloat64Array> {
+    using WrapperType = JSC::JSFloat64Array;
+    using ReturnType = RefPtr<JSC::Float64Array>;
+
+    template<typename ExceptionThrower = DefaultExceptionThrower>
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value, ExceptionThrower&& exceptionThrower = ExceptionThrower())
+    {
+        return Detail::BufferSourceConverter<IDLFloat64Array, Detail::BufferSourceConverterAllowSharedMode::Disallow>::convert(lexicalGlobalObject, value, std::forward<ExceptionThrower>(exceptionThrower));
+    }
+};
+
+template<> struct JSConverter<IDLFloat64Array> {
+    static constexpr bool needsState = true;
+    static constexpr bool needsGlobalObject = true;
+
+    template<typename U>
+    static JSC::JSValue convert(JSC::JSGlobalObject& lexicalGlobalObject, JSDOMGlobalObject& globalObject, const U& value)
+    {
+        return toJS(&lexicalGlobalObject, &globalObject, Detail::getPtrOrRef(value));
+    }
+};
+
+template<> struct Converter<IDLBigInt64Array> : DefaultConverter<IDLBigInt64Array> {
+    using WrapperType = JSC::JSBigInt64Array;
+    using ReturnType = RefPtr<JSC::BigInt64Array>;
+
+    template<typename ExceptionThrower = DefaultExceptionThrower>
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value, ExceptionThrower&& exceptionThrower = ExceptionThrower())
+    {
+        return Detail::BufferSourceConverter<IDLBigInt64Array, Detail::BufferSourceConverterAllowSharedMode::Disallow>::convert(lexicalGlobalObject, value, std::forward<ExceptionThrower>(exceptionThrower));
+    }
+};
+
+template<> struct JSConverter<IDLBigInt64Array> {
+    static constexpr bool needsState = true;
+    static constexpr bool needsGlobalObject = true;
+
+    template<typename U>
+    static JSC::JSValue convert(JSC::JSGlobalObject& lexicalGlobalObject, JSDOMGlobalObject& globalObject, const U& value)
+    {
+        return toJS(&lexicalGlobalObject, &globalObject, Detail::getPtrOrRef(value));
+    }
+};
+
+template<> struct Converter<IDLBigUint64Array> : DefaultConverter<IDLBigUint64Array> {
+    using WrapperType = JSC::JSBigUint64Array;
+    using ReturnType = RefPtr<JSC::BigUint64Array>;
+
+    template<typename ExceptionThrower = DefaultExceptionThrower>
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value, ExceptionThrower&& exceptionThrower = ExceptionThrower())
+    {
+        return Detail::BufferSourceConverter<IDLBigUint64Array, Detail::BufferSourceConverterAllowSharedMode::Disallow>::convert(lexicalGlobalObject, value, std::forward<ExceptionThrower>(exceptionThrower));
+    }
+};
+
+template<> struct JSConverter<IDLBigUint64Array> {
+    static constexpr bool needsState = true;
+    static constexpr bool needsGlobalObject = true;
+
+    template<typename U>
+    static JSC::JSValue convert(JSC::JSGlobalObject& lexicalGlobalObject, JSDOMGlobalObject& globalObject, const U& value)
+    {
+        return toJS(&lexicalGlobalObject, &globalObject, Detail::getPtrOrRef(value));
+    }
+};
+
+template<> struct Converter<IDLArrayBufferView> : DefaultConverter<IDLArrayBufferView> {
+    using WrapperType = JSC::JSArrayBufferView;
+    using ReturnType = RefPtr<JSC::ArrayBufferView>;
+
+    template<typename ExceptionThrower = DefaultExceptionThrower>
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value, ExceptionThrower&& exceptionThrower = ExceptionThrower())
+    {
+        return Detail::BufferSourceConverter<IDLArrayBufferView, Detail::BufferSourceConverterAllowSharedMode::Disallow>::convert(lexicalGlobalObject, value, std::forward<ExceptionThrower>(exceptionThrower));
+    }
+};
+
+template<> struct JSConverter<IDLArrayBufferView> {
+    static constexpr bool needsState = true;
+    static constexpr bool needsGlobalObject = true;
+
+    template<typename U>
+    static JSC::JSValue convert(JSC::JSGlobalObject& lexicalGlobalObject, JSDOMGlobalObject& globalObject, const U& value)
+    {
+        return toJS(&lexicalGlobalObject, &globalObject, Detail::getPtrOrRef(value));
+    }
+};
+
+template<typename T>
+struct Converter<IDLAllowSharedAdaptor<T>> : DefaultConverter<T> {
+    using ConverterType = Converter<T>;
+    using WrapperType = typename ConverterType::WrapperType;
+    using ReturnType = typename ConverterType::ReturnType;
+
+    template<typename ExceptionThrower = DefaultExceptionThrower>
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value, ExceptionThrower&& exceptionThrower = ExceptionThrower())
+    {
+        return Detail::BufferSourceConverter<T, Detail::BufferSourceConverterAllowSharedMode::Allow>::convert(lexicalGlobalObject, value, std::forward<ExceptionThrower>(exceptionThrower));
+    }
+};
+
+} // namespace WebCore
diff --git a/src/javascript/jsc/bindings/webcore/JSDOMConvertCallbacks.h b/src/javascript/jsc/bindings/webcore/JSDOMConvertCallbacks.h
new file mode 100644
index 000000000..c8ce13c14
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/JSDOMConvertCallbacks.h
@@ -0,0 +1,104 @@
+/*
+ * Copyright (C) 2016 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "IDLTypes.h"
+#include "JSDOMConvertBase.h"
+#include "JSDOMGlobalObject.h"
+
+namespace WebCore {
+
+template<typename T> struct Converter<IDLCallbackFunction<T>> : DefaultConverter<IDLCallbackFunction<T>> {
+
+    static constexpr bool conversionHasSideEffects = false;
+
+    template<typename ExceptionThrower = DefaultExceptionThrower>
+    static RefPtr<T> convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value, ExceptionThrower&& exceptionThrower = ExceptionThrower())
+    {
+        JSC::VM& vm = JSC::getVM(&lexicalGlobalObject);
+        auto scope = DECLARE_THROW_SCOPE(vm);
+
+        if (!value.isCallable(vm)) {
+            exceptionThrower(lexicalGlobalObject, scope);
+            return nullptr;
+        }
+
+        return T::create(vm, JSC::asObject(value));
+    }
+};
+
+template<typename T> struct JSConverter<IDLCallbackFunction<T>> {
+    static constexpr bool needsState = false;
+    static constexpr bool needsGlobalObject = false;
+
+    template <typename U>
+    static JSC::JSValue convert(const U& value)
+    {
+        return toJS(Detail::getPtrOrRef(value));
+    }
+
+    template<typename U>
+    static JSC::JSValue convertNewlyCreated(U&& value)
+    {
+        return toJSNewlyCreated(std::forward<U>(value));
+    }
+};
+
+
+template<typename T> struct Converter<IDLCallbackInterface<T>> : DefaultConverter<IDLCallbackInterface<T>> {
+    template<typename ExceptionThrower = DefaultExceptionThrower>
+    static RefPtr<T> convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value, ExceptionThrower&& exceptionThrower = ExceptionThrower())
+    {
+        JSC::VM& vm = JSC::getVM(&lexicalGlobalObject);
+        auto scope = DECLARE_THROW_SCOPE(vm);
+
+        if (!value.isObject()) {
+            exceptionThrower(lexicalGlobalObject, scope);
+            return nullptr;
+        }
+
+        return T::create(vm, JSC::asObject(value));
+    }
+};
+
+template<typename T> struct JSConverter<IDLCallbackInterface<T>> {
+    static constexpr bool needsState = false;
+    static constexpr bool needsGlobalObject = false;
+
+    template <typename U>
+    static JSC::JSValue convert(const U& value)
+    {
+        return toJS(Detail::getPtrOrRef(value));
+    }
+
+    template<typename U>
+    static JSC::JSValue convertNewlyCreated(U&& value)
+    {
+        return toJSNewlyCreated(std::forward<U>(value));
+    }
+};
+
+} // namespace WebCore
diff --git a/src/javascript/jsc/bindings/webcore/JSDOMConvertDate.cpp b/src/javascript/jsc/bindings/webcore/JSDOMConvertDate.cpp
new file mode 100644
index 000000000..739be11ef
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/JSDOMConvertDate.cpp
@@ -0,0 +1,53 @@
+/*
+ *  Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
+ *  Copyright (C) 2004-2011, 2013, 2016 Apple Inc. All rights reserved.
+ *  Copyright (C) 2007 Samuel Weinig <sam@webkit.org>
+ *  Copyright (C) 2013 Michael Pruett <michael@68k.org>
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include "config.h"
+#include "JSDOMConvertDate.h"
+
+#include "JavaScriptCore/DateInstance.h"
+#include "JavaScriptCore/HeapInlines.h"
+#include "JavaScriptCore/JSCJSValueInlines.h"
+#include "JavaScriptCore/JSGlobalObject.h"
+
+namespace WebCore {
+using namespace JSC;
+
+JSValue jsDate(JSGlobalObject& lexicalGlobalObject, WallTime value)
+{
+    return DateInstance::create(lexicalGlobalObject.vm(), lexicalGlobalObject.dateStructure(), value.secondsSinceEpoch().milliseconds());
+}
+
+WallTime valueToDate(JSC::JSGlobalObject& lexicalGlobalObject, JSValue value)
+{
+    double milliseconds = std::numeric_limits<double>::quiet_NaN();
+
+    auto& vm = lexicalGlobalObject.vm();
+    if (value.inherits<DateInstance>(vm))
+        milliseconds = jsCast<DateInstance*>(value)->internalNumber();
+    else if (value.isNumber())
+        milliseconds = value.asNumber();
+    else if (value.isString())
+        milliseconds = vm.dateCache.parseDate(&lexicalGlobalObject, vm, value.getString(&lexicalGlobalObject));
+
+    return WallTime::fromRawSeconds(Seconds::fromMilliseconds(milliseconds).value());
+}
+
+} // namespace WebCore
diff --git a/src/javascript/jsc/bindings/webcore/JSDOMConvertDate.h b/src/javascript/jsc/bindings/webcore/JSDOMConvertDate.h
new file mode 100644
index 000000000..de0a9f770
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/JSDOMConvertDate.h
@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2016 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "IDLTypes.h"
+#include "JSDOMConvertBase.h"
+#include "JavaScriptCore/JSGlobalObject.h"
+#include "wtf/WallTime.h"
+
+namespace WebCore {
+
+JSC::JSValue jsDate(JSC::JSGlobalObject&, WallTime value);
+WallTime valueToDate(JSC::JSGlobalObject&, JSC::JSValue); // NaN if the value can't be converted to a date.
+
+template<> struct Converter<IDLDate> : DefaultConverter<IDLDate> {
+    static WallTime convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+    {
+        return valueToDate(lexicalGlobalObject, value);
+    }
+};
+
+template<> struct JSConverter<IDLDate> {
+    static constexpr bool needsState = true;
+    static constexpr bool needsGlobalObject = false;
+
+    // FIXME: This should be taking a JSDOMGlobalObject and passing it to jsDate.
+    static JSC::JSValue convert(JSC::JSGlobalObject& lexicalGlobalObject, WallTime value)
+    {
+        return jsDate(lexicalGlobalObject, value);
+    }
+};
+
+} // namespace WebCore
diff --git a/src/javascript/jsc/bindings/webcore/JSDOMConvertDictionary.h b/src/javascript/jsc/bindings/webcore/JSDOMConvertDictionary.h
new file mode 100644
index 000000000..94173b16f
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/JSDOMConvertDictionary.h
@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2016 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "IDLTypes.h"
+#include "JSDOMConvertBase.h"
+
+namespace WebCore {
+
+// Specialized by generated code for IDL dictionary conversion.
+template<typename T> T convertDictionary(JSC::JSGlobalObject&, JSC::JSValue);
+
+
+template<typename T> struct Converter<IDLDictionary<T>> : DefaultConverter<IDLDictionary<T>> {
+    using ReturnType = T;
+
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+    {
+        return convertDictionary<T>(lexicalGlobalObject, value);
+    }
+};
+
+template<typename T> struct JSConverter<IDLDictionary<T>> {
+    static constexpr bool needsState = true;
+    static constexpr bool needsGlobalObject = true;
+
+    static JSC::JSValue convert(JSC::JSGlobalObject& lexicalGlobalObject, JSDOMGlobalObject& globalObject, const T& dictionary)
+    {
+        return convertDictionaryToJS(lexicalGlobalObject, globalObject, dictionary);
+    }
+};
+
+} // namespace WebCore
diff --git a/src/javascript/jsc/bindings/webcore/JSDOMConvertEnumeration.h b/src/javascript/jsc/bindings/webcore/JSDOMConvertEnumeration.h
new file mode 100644
index 000000000..d458e4aa8
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/JSDOMConvertEnumeration.h
@@ -0,0 +1,70 @@
+/*
+ * Copyright (C) 2016 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "IDLTypes.h"
+#include "JSDOMConvertBase.h"
+#include "JSDOMGlobalObject.h"
+
+namespace WebCore {
+
+// Specialized by generated code for IDL enumeration conversion.
+template<typename T> std::optional<T> parseEnumeration(JSC::JSGlobalObject&, JSC::JSValue);
+template<typename T> const char* expectedEnumerationValues();
+
+// Specialized by generated code for IDL enumeration conversion.
+template<typename T> JSC::JSString* convertEnumerationToJS(JSC::JSGlobalObject&, T);
+
+
+template<typename T> struct Converter<IDLEnumeration<T>> : DefaultConverter<IDLEnumeration<T>> {
+    template<typename ExceptionThrower = DefaultExceptionThrower>
+    static T convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value, ExceptionThrower&& exceptionThrower = ExceptionThrower())
+    {
+        auto& vm = JSC::getVM(&lexicalGlobalObject);
+        auto throwScope = DECLARE_THROW_SCOPE(vm);
+
+        auto result = parseEnumeration<T>(lexicalGlobalObject, value);
+        RETURN_IF_EXCEPTION(throwScope, { });
+
+        if (UNLIKELY(!result)) {
+            exceptionThrower(lexicalGlobalObject, throwScope);
+            return { };
+        }
+        return result.value();
+    }
+};
+
+template<typename T> struct JSConverter<IDLEnumeration<T>> {
+    static constexpr bool needsState = true;
+    static constexpr bool needsGlobalObject = false;
+
+    static JSC::JSValue convert(JSC::JSGlobalObject& lexicalGlobalObject, T value)
+    {
+        return convertEnumerationToJS(lexicalGlobalObject, value);
+    }
+};
+
+} // namespace WebCore
diff --git a/src/javascript/jsc/bindings/webcore/JSDOMConvertEventListener.h b/src/javascript/jsc/bindings/webcore/JSDOMConvertEventListener.h
new file mode 100644
index 000000000..09d0cbb6e
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/JSDOMConvertEventListener.h
@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2016 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "IDLTypes.h"
+#include "JSDOMConvertBase.h"
+
+namespace WebCore {
+
+template<typename T> struct Converter<IDLEventListener<T>> : DefaultConverter<IDLEventListener<T>> {
+    using ReturnType = RefPtr<T>;
+
+    template<typename ExceptionThrower = DefaultExceptionThrower>
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value, JSC::JSObject& thisObject, ExceptionThrower&& exceptionThrower = ExceptionThrower())
+    {
+        auto scope = DECLARE_THROW_SCOPE(JSC::getVM(&lexicalGlobalObject));
+
+        if (UNLIKELY(!value.isObject())) {
+            exceptionThrower(lexicalGlobalObject, scope);
+            return nullptr;
+        }
+
+        bool isAttribute = false;
+        return T::create(*asObject(value), thisObject, isAttribute, currentWorld(lexicalGlobalObject));
+    }
+};
+
+} // namespace WebCore
diff --git a/src/javascript/jsc/bindings/webcore/JSDOMConvertInterface.h b/src/javascript/jsc/bindings/webcore/JSDOMConvertInterface.h
new file mode 100644
index 000000000..349276467
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/JSDOMConvertInterface.h
@@ -0,0 +1,105 @@
+/*
+ * Copyright (C) 2016 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "root.h"
+
+#include "IDLTypes.h"
+#include "JSDOMConvertBase.h"
+#include "JavaScriptCore/Error.h"
+
+namespace WebCore {
+
+template<typename ImplementationClass> struct JSDOMWrapperConverterTraits;
+
+template<typename T, typename Enable = void>
+struct JSToWrappedOverloader {
+    using ReturnType = typename JSDOMWrapperConverterTraits<T>::ToWrappedReturnType;
+    using WrapperType = typename JSDOMWrapperConverterTraits<T>::WrapperClass;
+
+    static ReturnType toWrapped(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+    {
+        return WrapperType::toWrapped(JSC::getVM(&lexicalGlobalObject), value);
+    }
+};
+
+template<typename T>
+struct JSToWrappedOverloader<T, typename std::enable_if<JSDOMWrapperConverterTraits<T>::needsState>::type> {
+    using ReturnType = typename JSDOMWrapperConverterTraits<T>::ToWrappedReturnType;
+    using WrapperType = typename JSDOMWrapperConverterTraits<T>::WrapperClass;
+
+    static ReturnType toWrapped(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+    {
+        return WrapperType::toWrapped(lexicalGlobalObject, value);
+    }
+};
+
+template<typename T> struct Converter<IDLInterface<T>> : DefaultConverter<IDLInterface<T>> {
+    using ReturnType = typename JSDOMWrapperConverterTraits<T>::ToWrappedReturnType;
+    using WrapperType = typename JSDOMWrapperConverterTraits<T>::WrapperClass;
+
+    template<typename ExceptionThrower = DefaultExceptionThrower>
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value, ExceptionThrower&& exceptionThrower = ExceptionThrower())
+    {
+        auto& vm = JSC::getVM(&lexicalGlobalObject);
+        auto scope = DECLARE_THROW_SCOPE(vm);
+        ReturnType object = JSToWrappedOverloader<T>::toWrapped(lexicalGlobalObject, value);
+        if (UNLIKELY(!object))
+            exceptionThrower(lexicalGlobalObject, scope);
+        return object;
+    }
+};
+
+template<typename T> struct JSConverter<IDLInterface<T>> {
+    static constexpr bool needsState = true;
+    static constexpr bool needsGlobalObject = true;
+
+    template<typename U>
+    static JSC::JSValue convert(JSC::JSGlobalObject& lexicalGlobalObject, JSDOMGlobalObject& globalObject, const U& value)
+    {
+        return toJS(&lexicalGlobalObject, &globalObject, Detail::getPtrOrRef(value));
+    }
+
+    template<typename U>
+    static JSC::JSValue convertNewlyCreated(JSC::JSGlobalObject& lexicalGlobalObject, JSDOMGlobalObject& globalObject, U&& value)
+    {
+        return toJSNewlyCreated(&lexicalGlobalObject, &globalObject, std::forward<U>(value));
+    }
+};
+
+template<typename T> struct VariadicConverter<IDLInterface<T>> {
+    using Item = std::reference_wrapper<T>;
+
+    static std::optional<Item> convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+    {
+        auto* result = Converter<IDLInterface<T>>::convert(lexicalGlobalObject, value);
+        if (!result)
+            return std::nullopt;
+        return std::optional<Item> { *result };
+    }
+};
+
+} // namespace WebCore
diff --git a/src/javascript/jsc/bindings/webcore/JSDOMConvertJSON.h b/src/javascript/jsc/bindings/webcore/JSDOMConvertJSON.h
new file mode 100644
index 000000000..9a289ef6c
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/JSDOMConvertJSON.h
@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2016 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "IDLTypes.h"
+#include "JSDOMConvertBase.h"
+#include "JavaScriptCore/JSONObject.h"
+
+namespace WebCore {
+
+template<> struct Converter<IDLJSON> : DefaultConverter<IDLJSON> {
+    static String convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+    {
+        return JSC::JSONStringify(&lexicalGlobalObject, value, 0);
+    }
+};
+
+template<> struct JSConverter<IDLJSON> {
+    static constexpr bool needsState = true;
+    static constexpr bool needsGlobalObject = false;
+
+    static JSC::JSValue convert(JSC::JSGlobalObject& lexicalGlobalObject, const String& value)
+    {
+        return JSC::JSONParse(&lexicalGlobalObject, value);
+    }
+};
+
+} // namespace WebCore
diff --git a/src/javascript/jsc/bindings/webcore/JSDOMConvertNull.h b/src/javascript/jsc/bindings/webcore/JSDOMConvertNull.h
new file mode 100644
index 000000000..b132825d2
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/JSDOMConvertNull.h
@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2016 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "IDLTypes.h"
+#include "JSDOMConvertBase.h"
+
+namespace WebCore {
+
+template<> struct Converter<IDLNull> : DefaultConverter<IDLNull> {
+    static std::nullptr_t convert(JSC::JSGlobalObject&, JSC::JSValue)
+    {
+        return nullptr;
+    }
+};
+
+template<> struct JSConverter<IDLNull> {
+    static constexpr bool needsState = false;
+    static constexpr bool needsGlobalObject = false;
+
+    static JSC::JSValue convert(std::nullptr_t)
+    {
+        return JSC::jsNull();
+    }
+};
+
+} // namespace WebCore
diff --git a/src/javascript/jsc/bindings/webcore/JSDOMConvertNullable.h b/src/javascript/jsc/bindings/webcore/JSDOMConvertNullable.h
new file mode 100644
index 000000000..a3e4b5cc4
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/JSDOMConvertNullable.h
@@ -0,0 +1,150 @@
+/*
+ * Copyright (C) 2016 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "IDLTypes.h"
+#include "JSDOMConvertAny.h"
+#include "JSDOMConvertInterface.h"
+#include "JSDOMConvertNumbers.h"
+#include "JSDOMConvertStrings.h"
+
+namespace WebCore {
+
+namespace Detail {
+
+template<typename IDLType>
+struct NullableConversionType;
+
+template<typename IDLType> 
+struct NullableConversionType {
+    using Type = typename IDLNullable<IDLType>::ImplementationType;
+};
+
+template<typename T>
+struct NullableConversionType<IDLInterface<T>> {
+    using Type = typename Converter<IDLInterface<T>>::ReturnType;
+};
+
+template<>
+struct NullableConversionType<IDLAny> {
+    using Type = typename Converter<IDLAny>::ReturnType;
+};
+
+}
+
+template<typename T> struct Converter<IDLNullable<T>> : DefaultConverter<IDLNullable<T>> {
+    using ReturnType = typename Detail::NullableConversionType<T>::Type;
+    
+    // 1. If Type(V) is not Object, and the conversion to an IDL value is being performed
+    // due to V being assigned to an attribute whose type is a nullable callback function
+    // that is annotated with [LegacyTreatNonObjectAsNull], then return the IDL nullable
+    // type T? value null.
+    //
+    // NOTE: Handled elsewhere.
+    //
+    // 2. Otherwise, if V is null or undefined, then return the IDL nullable type T? value null.
+    // 3. Otherwise, return the result of converting V using the rules for the inner IDL type T.
+
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+    {
+        if (value.isUndefinedOrNull())
+            return T::nullValue();
+        return Converter<T>::convert(lexicalGlobalObject, value);
+    }
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value, JSC::JSObject& thisObject)
+    {
+        if (value.isUndefinedOrNull())
+            return T::nullValue();
+        return Converter<T>::convert(lexicalGlobalObject, value, thisObject);
+    }
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value, JSDOMGlobalObject& globalObject)
+    {
+        if (value.isUndefinedOrNull())
+            return T::nullValue();
+        return Converter<T>::convert(lexicalGlobalObject, value, globalObject);
+    }
+    template<typename ExceptionThrower = DefaultExceptionThrower>
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value, ExceptionThrower&& exceptionThrower)
+    {
+        if (value.isUndefinedOrNull())
+            return T::nullValue();
+        return Converter<T>::convert(lexicalGlobalObject, value, std::forward<ExceptionThrower>(exceptionThrower));
+    }
+    template<typename ExceptionThrower = DefaultExceptionThrower>
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value, JSC::JSObject& thisObject, ExceptionThrower&& exceptionThrower)
+    {
+        if (value.isUndefinedOrNull())
+            return T::nullValue();
+        return Converter<T>::convert(lexicalGlobalObject, value, thisObject, std::forward<ExceptionThrower>(exceptionThrower));
+    }
+    template<typename ExceptionThrower = DefaultExceptionThrower>
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value, JSDOMGlobalObject& globalObject, ExceptionThrower&& exceptionThrower)
+    {
+        if (value.isUndefinedOrNull())
+            return T::nullValue();
+        return Converter<T>::convert(lexicalGlobalObject, value, globalObject, std::forward<ExceptionThrower>(exceptionThrower));
+    }
+};
+
+template<typename T> struct JSConverter<IDLNullable<T>> {
+    using ImplementationType = typename IDLNullable<T>::ImplementationType;
+
+    static constexpr bool needsState = JSConverter<T>::needsState;
+    static constexpr bool needsGlobalObject = JSConverter<T>::needsGlobalObject;
+
+    template<typename U>
+    static JSC::JSValue convert(U&& value)
+    {
+        if (T::isNullValue(value))
+            return JSC::jsNull();
+        return JSConverter<T>::convert(T::extractValueFromNullable(value));
+    }
+    template<typename U>
+    static JSC::JSValue convert(JSC::JSGlobalObject& lexicalGlobalObject, U&& value)
+    {
+        if (T::isNullValue(value))
+            return JSC::jsNull();
+        return JSConverter<T>::convert(lexicalGlobalObject, T::extractValueFromNullable(value));
+    }
+    template<typename U>
+    static JSC::JSValue convert(JSC::JSGlobalObject& lexicalGlobalObject, JSDOMGlobalObject& globalObject, U&& value)
+    {
+        if (T::isNullValue(value))
+            return JSC::jsNull();
+        return JSConverter<T>::convert(lexicalGlobalObject, globalObject, T::extractValueFromNullable(value));
+    }
+
+    template<typename U>
+    static JSC::JSValue convertNewlyCreated(JSC::JSGlobalObject& lexicalGlobalObject, JSDOMGlobalObject& globalObject, U&& value)
+    {
+        if (T::isNullValue(value))
+            return JSC::jsNull();
+        return JSConverter<T>::convert(lexicalGlobalObject, globalObject, T::extractValueFromNullable(value));
+    }
+};
+
+
+} // namespace WebCore
diff --git a/src/javascript/jsc/bindings/webcore/JSDOMConvertNumbers.cpp b/src/javascript/jsc/bindings/webcore/JSDOMConvertNumbers.cpp
new file mode 100644
index 000000000..438d32723
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/JSDOMConvertNumbers.cpp
@@ -0,0 +1,379 @@
+/*
+ *  Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
+ *  Copyright (C) 2004-2011, 2013, 2016 Apple Inc. All rights reserved.
+ *  Copyright (C) 2007 Samuel Weinig <sam@webkit.org>
+ *  Copyright (C) 2013 Michael Pruett <michael@68k.org>
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include "config.h"
+#include "JSDOMConvertNumbers.h"
+
+#include "JSDOMExceptionHandling.h"
+#include "JavaScriptCore/HeapInlines.h"
+#include "JavaScriptCore/JSCJSValueInlines.h"
+#include "wtf/MathExtras.h"
+#include "wtf/text/StringConcatenateNumbers.h"
+#include "wtf/text/WTFString.h"
+
+namespace WebCore {
+using namespace JSC;
+
+enum class IntegerConversionConfiguration { Normal,
+    EnforceRange,
+    Clamp };
+
+static const int32_t kMaxInt32 = 0x7fffffff;
+static const int32_t kMinInt32 = -kMaxInt32 - 1;
+static const uint32_t kMaxUInt32 = 0xffffffffU;
+static const int64_t kJSMaxInteger = 0x20000000000000LL - 1; // 2^53 - 1, largest integer exactly representable in ECMAScript.
+
+static String rangeErrorString(double value, double min, double max)
+{
+    return makeString("Value ", value, " is outside the range [", min, ", ", max, ']');
+}
+
+static double enforceRange(JSGlobalObject& lexicalGlobalObject, double x, double minimum, double maximum)
+{
+    VM& vm = lexicalGlobalObject.vm();
+    auto scope = DECLARE_THROW_SCOPE(vm);
+
+    if (std::isnan(x) || std::isinf(x)) {
+        throwTypeError(&lexicalGlobalObject, scope, rangeErrorString(x, minimum, maximum));
+        return 0;
+    }
+    x = trunc(x);
+    if (x < minimum || x > maximum) {
+        throwTypeError(&lexicalGlobalObject, scope, rangeErrorString(x, minimum, maximum));
+        return 0;
+    }
+    return x;
+}
+
+namespace {
+
+template<typename T>
+struct IntTypeLimits {
+};
+
+template<>
+struct IntTypeLimits<int8_t> {
+    static const int8_t minValue = -128;
+    static const int8_t maxValue = 127;
+    static const unsigned numberOfValues = 256; // 2^8
+};
+
+template<>
+struct IntTypeLimits<uint8_t> {
+    static const uint8_t maxValue = 255;
+    static const unsigned numberOfValues = 256; // 2^8
+};
+
+template<>
+struct IntTypeLimits<int16_t> {
+    static const short minValue = -32768;
+    static const short maxValue = 32767;
+    static const unsigned numberOfValues = 65536; // 2^16
+};
+
+template<>
+struct IntTypeLimits<uint16_t> {
+    static const unsigned short maxValue = 65535;
+    static const unsigned numberOfValues = 65536; // 2^16
+};
+
+}
+
+template<typename T, IntegerConversionConfiguration configuration>
+static inline T toSmallerInt(JSGlobalObject& lexicalGlobalObject, JSValue value)
+{
+    VM& vm = lexicalGlobalObject.vm();
+    auto scope = DECLARE_THROW_SCOPE(vm);
+
+    static_assert(std::is_signed<T>::value && std::is_integral<T>::value, "Should only be used for signed integral types");
+
+    typedef IntTypeLimits<T> LimitsTrait;
+    // Fast path if the value is already a 32-bit signed integer in the right range.
+    if (value.isInt32()) {
+        int32_t d = value.asInt32();
+        if (d >= LimitsTrait::minValue && d <= LimitsTrait::maxValue)
+            return static_cast<T>(d);
+        switch (configuration) {
+        case IntegerConversionConfiguration::Normal:
+            break;
+        case IntegerConversionConfiguration::EnforceRange:
+            throwTypeError(&lexicalGlobalObject, scope);
+            return 0;
+        case IntegerConversionConfiguration::Clamp:
+            return d < LimitsTrait::minValue ? LimitsTrait::minValue : LimitsTrait::maxValue;
+        }
+        d %= LimitsTrait::numberOfValues;
+        return static_cast<T>(d > LimitsTrait::maxValue ? d - LimitsTrait::numberOfValues : d);
+    }
+
+    double x = value.toNumber(&lexicalGlobalObject);
+    RETURN_IF_EXCEPTION(scope, 0);
+
+    switch (configuration) {
+    case IntegerConversionConfiguration::Normal:
+        break;
+    case IntegerConversionConfiguration::EnforceRange:
+        return enforceRange(lexicalGlobalObject, x, LimitsTrait::minValue, LimitsTrait::maxValue);
+    case IntegerConversionConfiguration::Clamp:
+        return std::isnan(x) ? 0 : clampTo<T>(x);
+    }
+
+    if (std::isnan(x) || std::isinf(x) || !x)
+        return 0;
+
+    x = x < 0 ? -floor(fabs(x)) : floor(fabs(x));
+    x = fmod(x, LimitsTrait::numberOfValues);
+
+    return static_cast<T>(x > LimitsTrait::maxValue ? x - LimitsTrait::numberOfValues : x);
+}
+
+template<typename T, IntegerConversionConfiguration configuration>
+static inline T toSmallerUInt(JSGlobalObject& lexicalGlobalObject, JSValue value)
+{
+    VM& vm = lexicalGlobalObject.vm();
+    auto scope = DECLARE_THROW_SCOPE(vm);
+
+    static_assert(std::is_unsigned<T>::value && std::is_integral<T>::value, "Should only be used for unsigned integral types");
+
+    typedef IntTypeLimits<T> LimitsTrait;
+    // Fast path if the value is already a 32-bit unsigned integer in the right range.
+    if (value.isUInt32()) {
+        uint32_t d = value.asUInt32();
+        if (d <= LimitsTrait::maxValue)
+            return static_cast<T>(d);
+        switch (configuration) {
+        case IntegerConversionConfiguration::Normal:
+            return static_cast<T>(d);
+        case IntegerConversionConfiguration::EnforceRange:
+            throwTypeError(&lexicalGlobalObject, scope);
+            return 0;
+        case IntegerConversionConfiguration::Clamp:
+            return LimitsTrait::maxValue;
+        }
+    }
+
+    double x = value.toNumber(&lexicalGlobalObject);
+    RETURN_IF_EXCEPTION(scope, 0);
+
+    switch (configuration) {
+    case IntegerConversionConfiguration::Normal:
+        break;
+    case IntegerConversionConfiguration::EnforceRange:
+        return enforceRange(lexicalGlobalObject, x, 0, LimitsTrait::maxValue);
+    case IntegerConversionConfiguration::Clamp:
+        return std::isnan(x) ? 0 : clampTo<T>(x);
+    }
+
+    if (std::isnan(x) || std::isinf(x) || !x)
+        return 0;
+
+    x = x < 0 ? -floor(fabs(x)) : floor(fabs(x));
+    x = fmod(x, LimitsTrait::numberOfValues);
+    if (x < 0)
+        x += LimitsTrait::numberOfValues;
+    return static_cast<T>(x);
+}
+
+template<> int8_t convertToIntegerEnforceRange<int8_t>(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+{
+    return toSmallerInt<int8_t, IntegerConversionConfiguration::EnforceRange>(lexicalGlobalObject, value);
+}
+
+template<> uint8_t convertToIntegerEnforceRange<uint8_t>(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+{
+    return toSmallerUInt<uint8_t, IntegerConversionConfiguration::EnforceRange>(lexicalGlobalObject, value);
+}
+
+template<> int8_t convertToIntegerClamp<int8_t>(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+{
+    return toSmallerInt<int8_t, IntegerConversionConfiguration::Clamp>(lexicalGlobalObject, value);
+}
+
+template<> uint8_t convertToIntegerClamp<uint8_t>(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+{
+    return toSmallerUInt<uint8_t, IntegerConversionConfiguration::Clamp>(lexicalGlobalObject, value);
+}
+
+template<> int8_t convertToInteger<int8_t>(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+{
+    return toSmallerInt<int8_t, IntegerConversionConfiguration::Normal>(lexicalGlobalObject, value);
+}
+
+template<> uint8_t convertToInteger<uint8_t>(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+{
+    return toSmallerUInt<uint8_t, IntegerConversionConfiguration::Normal>(lexicalGlobalObject, value);
+}
+
+template<> int16_t convertToIntegerEnforceRange<int16_t>(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+{
+    return toSmallerInt<int16_t, IntegerConversionConfiguration::EnforceRange>(lexicalGlobalObject, value);
+}
+
+template<> uint16_t convertToIntegerEnforceRange<uint16_t>(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+{
+    return toSmallerUInt<uint16_t, IntegerConversionConfiguration::EnforceRange>(lexicalGlobalObject, value);
+}
+
+template<> int16_t convertToIntegerClamp<int16_t>(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+{
+    return toSmallerInt<int16_t, IntegerConversionConfiguration::Clamp>(lexicalGlobalObject, value);
+}
+
+template<> uint16_t convertToIntegerClamp<uint16_t>(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+{
+    return toSmallerUInt<uint16_t, IntegerConversionConfiguration::Clamp>(lexicalGlobalObject, value);
+}
+
+template<> int16_t convertToInteger<int16_t>(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+{
+    return toSmallerInt<int16_t, IntegerConversionConfiguration::Normal>(lexicalGlobalObject, value);
+}
+
+template<> uint16_t convertToInteger<uint16_t>(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+{
+    return toSmallerUInt<uint16_t, IntegerConversionConfiguration::Normal>(lexicalGlobalObject, value);
+}
+
+template<> int32_t convertToIntegerEnforceRange<int32_t>(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+{
+    if (value.isInt32())
+        return value.asInt32();
+
+    VM& vm = lexicalGlobalObject.vm();
+    auto scope = DECLARE_THROW_SCOPE(vm);
+
+    double x = value.toNumber(&lexicalGlobalObject);
+    RETURN_IF_EXCEPTION(scope, 0);
+    return enforceRange(lexicalGlobalObject, x, kMinInt32, kMaxInt32);
+}
+
+template<> uint32_t convertToIntegerEnforceRange<uint32_t>(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+{
+    if (value.isUInt32())
+        return value.asUInt32();
+
+    VM& vm = lexicalGlobalObject.vm();
+    auto scope = DECLARE_THROW_SCOPE(vm);
+
+    double x = value.toNumber(&lexicalGlobalObject);
+    RETURN_IF_EXCEPTION(scope, 0);
+    return enforceRange(lexicalGlobalObject, x, 0, kMaxUInt32);
+}
+
+template<> int32_t convertToIntegerClamp<int32_t>(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+{
+    if (value.isInt32())
+        return value.asInt32();
+
+    double x = value.toNumber(&lexicalGlobalObject);
+    return std::isnan(x) ? 0 : clampTo<int32_t>(x);
+}
+
+template<> uint32_t convertToIntegerClamp<uint32_t>(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+{
+    if (value.isUInt32())
+        return value.asUInt32();
+
+    double x = value.toNumber(&lexicalGlobalObject);
+    return std::isnan(x) ? 0 : clampTo<uint32_t>(x);
+}
+
+template<> int32_t convertToInteger<int32_t>(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+{
+    return value.toInt32(&lexicalGlobalObject);
+}
+
+template<> uint32_t convertToInteger<uint32_t>(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+{
+    return value.toUInt32(&lexicalGlobalObject);
+}
+
+template<> int64_t convertToIntegerEnforceRange<int64_t>(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+{
+    if (value.isInt32())
+        return value.asInt32();
+
+    VM& vm = lexicalGlobalObject.vm();
+    auto scope = DECLARE_THROW_SCOPE(vm);
+
+    double x = value.toNumber(&lexicalGlobalObject);
+    RETURN_IF_EXCEPTION(scope, 0);
+    return enforceRange(lexicalGlobalObject, x, -kJSMaxInteger, kJSMaxInteger);
+}
+
+template<> uint64_t convertToIntegerEnforceRange<uint64_t>(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+{
+    if (value.isUInt32())
+        return value.asUInt32();
+
+    VM& vm = lexicalGlobalObject.vm();
+    auto scope = DECLARE_THROW_SCOPE(vm);
+
+    double x = value.toNumber(&lexicalGlobalObject);
+    RETURN_IF_EXCEPTION(scope, 0);
+    return enforceRange(lexicalGlobalObject, x, 0, kJSMaxInteger);
+}
+
+template<> int64_t convertToIntegerClamp<int64_t>(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+{
+    if (value.isInt32())
+        return value.asInt32();
+
+    double x = value.toNumber(&lexicalGlobalObject);
+    return std::isnan(x) ? 0 : static_cast<int64_t>(std::min<double>(std::max<double>(x, -kJSMaxInteger), kJSMaxInteger));
+}
+
+template<> uint64_t convertToIntegerClamp<uint64_t>(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+{
+    if (value.isUInt32())
+        return value.asUInt32();
+
+    double x = value.toNumber(&lexicalGlobalObject);
+    return std::isnan(x) ? 0 : static_cast<uint64_t>(std::min<double>(std::max<double>(x, 0), kJSMaxInteger));
+}
+
+template<> int64_t convertToInteger<int64_t>(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+{
+    if (value.isInt32())
+        return value.asInt32();
+
+    double x = value.toNumber(&lexicalGlobalObject);
+
+    // Map NaNs and +/-Infinity to 0; convert finite values modulo 2^64.
+    unsigned long long n;
+    doubleToInteger(x, n);
+    return n;
+}
+
+template<> uint64_t convertToInteger<uint64_t>(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+{
+    if (value.isUInt32())
+        return value.asUInt32();
+
+    double x = value.toNumber(&lexicalGlobalObject);
+
+    // Map NaNs and +/-Infinity to 0; convert finite values modulo 2^64.
+    unsigned long long n;
+    doubleToInteger(x, n);
+    return n;
+}
+
+} // namespace WebCore
diff --git a/src/javascript/jsc/bindings/webcore/JSDOMConvertNumbers.h b/src/javascript/jsc/bindings/webcore/JSDOMConvertNumbers.h
new file mode 100644
index 000000000..399a85ebb
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/JSDOMConvertNumbers.h
@@ -0,0 +1,409 @@
+/*
+ * Copyright (C) 2016 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "IDLTypes.h"
+#include "JSDOMConvertBase.h"
+#include "JSDOMExceptionHandling.h"
+#include "JavaScriptCore/JSCJSValueInlines.h"
+#include "JavaScriptCore/PureNaN.h"
+
+namespace WebCore {
+
+// The following functions convert values to integers as per the WebIDL specification.
+// The conversion fails if the value cannot be converted to a number or, if EnforceRange is specified,
+// the value is outside the range of the destination integer type.
+
+template<typename T> T convertToInteger(JSC::JSGlobalObject&, JSC::JSValue);
+template<> WEBCORE_EXPORT int8_t convertToInteger<int8_t>(JSC::JSGlobalObject&, JSC::JSValue);
+template<> WEBCORE_EXPORT uint8_t convertToInteger<uint8_t>(JSC::JSGlobalObject&, JSC::JSValue);
+template<> WEBCORE_EXPORT int16_t convertToInteger<int16_t>(JSC::JSGlobalObject&, JSC::JSValue);
+template<> WEBCORE_EXPORT uint16_t convertToInteger<uint16_t>(JSC::JSGlobalObject&, JSC::JSValue);
+template<> WEBCORE_EXPORT int32_t convertToInteger<int32_t>(JSC::JSGlobalObject&, JSC::JSValue);
+template<> WEBCORE_EXPORT uint32_t convertToInteger<uint32_t>(JSC::JSGlobalObject&, JSC::JSValue);
+template<> WEBCORE_EXPORT int64_t convertToInteger<int64_t>(JSC::JSGlobalObject&, JSC::JSValue);
+template<> WEBCORE_EXPORT uint64_t convertToInteger<uint64_t>(JSC::JSGlobalObject&, JSC::JSValue);
+
+template<typename T> T convertToIntegerEnforceRange(JSC::JSGlobalObject&, JSC::JSValue);
+template<> WEBCORE_EXPORT int8_t convertToIntegerEnforceRange<int8_t>(JSC::JSGlobalObject&, JSC::JSValue);
+template<> WEBCORE_EXPORT uint8_t convertToIntegerEnforceRange<uint8_t>(JSC::JSGlobalObject&, JSC::JSValue);
+template<> WEBCORE_EXPORT int16_t convertToIntegerEnforceRange<int16_t>(JSC::JSGlobalObject&, JSC::JSValue);
+template<> WEBCORE_EXPORT uint16_t convertToIntegerEnforceRange<uint16_t>(JSC::JSGlobalObject&, JSC::JSValue);
+template<> WEBCORE_EXPORT int32_t convertToIntegerEnforceRange<int32_t>(JSC::JSGlobalObject&, JSC::JSValue);
+template<> WEBCORE_EXPORT uint32_t convertToIntegerEnforceRange<uint32_t>(JSC::JSGlobalObject&, JSC::JSValue);
+template<> WEBCORE_EXPORT int64_t convertToIntegerEnforceRange<int64_t>(JSC::JSGlobalObject&, JSC::JSValue);
+template<> WEBCORE_EXPORT uint64_t convertToIntegerEnforceRange<uint64_t>(JSC::JSGlobalObject&, JSC::JSValue);
+
+template<typename T> T convertToIntegerClamp(JSC::JSGlobalObject&, JSC::JSValue);
+template<> WEBCORE_EXPORT int8_t convertToIntegerClamp<int8_t>(JSC::JSGlobalObject&, JSC::JSValue);
+template<> WEBCORE_EXPORT uint8_t convertToIntegerClamp<uint8_t>(JSC::JSGlobalObject&, JSC::JSValue);
+template<> WEBCORE_EXPORT int16_t convertToIntegerClamp<int16_t>(JSC::JSGlobalObject&, JSC::JSValue);
+template<> WEBCORE_EXPORT uint16_t convertToIntegerClamp<uint16_t>(JSC::JSGlobalObject&, JSC::JSValue);
+template<> WEBCORE_EXPORT int32_t convertToIntegerClamp<int32_t>(JSC::JSGlobalObject&, JSC::JSValue);
+template<> WEBCORE_EXPORT uint32_t convertToIntegerClamp<uint32_t>(JSC::JSGlobalObject&, JSC::JSValue);
+template<> WEBCORE_EXPORT int64_t convertToIntegerClamp<int64_t>(JSC::JSGlobalObject&, JSC::JSValue);
+template<> WEBCORE_EXPORT uint64_t convertToIntegerClamp<uint64_t>(JSC::JSGlobalObject&, JSC::JSValue);
+
+// MARK: -
+// MARK: Integer types
+
+template<> struct Converter<IDLByte> : DefaultConverter<IDLByte> {
+    static int8_t convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+    {
+        return convertToInteger<int8_t>(lexicalGlobalObject, value);
+    }
+};
+
+template<> struct JSConverter<IDLByte> {
+    using Type = typename IDLByte::ImplementationType;
+
+    static constexpr bool needsState = false;
+    static constexpr bool needsGlobalObject = false;
+
+    static JSC::JSValue convert(Type value)
+    {
+        return JSC::jsNumber(value);
+    }
+};
+
+template<> struct Converter<IDLOctet> : DefaultConverter<IDLOctet> {
+    static uint8_t convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+    {
+        return convertToInteger<uint8_t>(lexicalGlobalObject, value);
+    }
+};
+
+template<> struct JSConverter<IDLOctet> {
+    using Type = typename IDLOctet::ImplementationType;
+
+    static constexpr bool needsState = false;
+    static constexpr bool needsGlobalObject = false;
+
+    static JSC::JSValue convert(Type value)
+    {
+        return JSC::jsNumber(value);
+    }
+};
+
+template<> struct Converter<IDLShort> : DefaultConverter<IDLShort> {
+    static int16_t convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+    {
+        return convertToInteger<int16_t>(lexicalGlobalObject, value);
+    }
+};
+
+template<> struct JSConverter<IDLShort> {
+    using Type = typename IDLShort::ImplementationType;
+
+    static constexpr bool needsState = false;
+    static constexpr bool needsGlobalObject = false;
+
+    static JSC::JSValue convert(Type value)
+    {
+        return JSC::jsNumber(value);
+    }
+};
+
+template<> struct Converter<IDLUnsignedShort> : DefaultConverter<IDLUnsignedShort> {
+    static uint16_t convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+    {
+        return convertToInteger<uint16_t>(lexicalGlobalObject, value);
+    }
+};
+
+template<> struct JSConverter<IDLUnsignedShort> {
+    using Type = typename IDLUnsignedShort::ImplementationType;
+
+    static constexpr bool needsState = false;
+    static constexpr bool needsGlobalObject = false;
+
+    static JSC::JSValue convert(Type value)
+    {
+        return JSC::jsNumber(value);
+    }
+};
+
+template<> struct Converter<IDLLong> : DefaultConverter<IDLLong> {
+    static inline int32_t convert(JSC::JSGlobalObject&, JSC::ThrowScope&, double number)
+    {
+        return JSC::toInt32(number);
+    }
+
+    static int32_t convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+    {
+        return convertToInteger<int32_t>(lexicalGlobalObject, value);
+    }
+};
+
+template<> struct JSConverter<IDLLong> {
+    using Type = typename IDLLong::ImplementationType;
+
+    static constexpr bool needsState = false;
+    static constexpr bool needsGlobalObject = false;
+
+    static JSC::JSValue convert(Type value)
+    {
+        return JSC::jsNumber(value);
+    }
+};
+
+template<> struct Converter<IDLUnsignedLong> : DefaultConverter<IDLUnsignedLong> {
+    static uint32_t convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+    {
+        return convertToInteger<uint32_t>(lexicalGlobalObject, value);
+    }
+};
+
+template<> struct JSConverter<IDLUnsignedLong> {
+    using Type = typename IDLUnsignedLong::ImplementationType;
+
+    static constexpr bool needsState = false;
+    static constexpr bool needsGlobalObject = false;
+
+    static JSC::JSValue convert(Type value)
+    {
+        return JSC::jsNumber(value);
+    }
+};
+
+template<> struct Converter<IDLLongLong> : DefaultConverter<IDLLongLong> {
+    static int64_t convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+    {
+        return convertToInteger<int64_t>(lexicalGlobalObject, value);
+    }
+};
+
+template<> struct JSConverter<IDLLongLong> {
+    using Type = typename IDLLongLong::ImplementationType;
+
+    static constexpr bool needsState = false;
+    static constexpr bool needsGlobalObject = false;
+
+    static JSC::JSValue convert(Type value)
+    {
+        return JSC::jsNumber(value);
+    }
+};
+
+template<> struct Converter<IDLUnsignedLongLong> : DefaultConverter<IDLUnsignedLongLong> {
+    static uint64_t convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+    {
+        return convertToInteger<uint64_t>(lexicalGlobalObject, value);
+    }
+};
+
+template<> struct JSConverter<IDLUnsignedLongLong> {
+    using Type = typename IDLUnsignedLongLong::ImplementationType;
+
+    static constexpr bool needsState = false;
+    static constexpr bool needsGlobalObject = false;
+
+    static JSC::JSValue convert(Type value)
+    {
+        return JSC::jsNumber(value);
+    }
+};
+
+// MARK: -
+// MARK: Annotated Integer types
+
+template<typename T> struct Converter<IDLClampAdaptor<T>> : DefaultConverter<IDLClampAdaptor<T>> {
+    using ReturnType = typename IDLClampAdaptor<T>::ImplementationType;
+
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+    {
+        return convertToIntegerClamp<ReturnType>(lexicalGlobalObject, value);
+    }
+};
+
+template<typename T> struct JSConverter<IDLClampAdaptor<T>> {
+    using Type = typename IDLClampAdaptor<T>::ImplementationType;
+
+    static constexpr bool needsState = false;
+    static constexpr bool needsGlobalObject = false;
+
+    static JSC::JSValue convert(Type value)
+    {
+        return JSConverter<T>::convert(value);
+    }
+};
+
+template<typename T> struct Converter<IDLEnforceRangeAdaptor<T>> : DefaultConverter<IDLEnforceRangeAdaptor<T>> {
+    using ReturnType = typename IDLEnforceRangeAdaptor<T>::ImplementationType;
+
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+    {
+        return convertToIntegerEnforceRange<ReturnType>(lexicalGlobalObject, value);
+    }
+};
+
+template<typename T> struct JSConverter<IDLEnforceRangeAdaptor<T>> {
+    using Type = typename IDLEnforceRangeAdaptor<T>::ImplementationType;
+
+    static constexpr bool needsState = false;
+    static constexpr bool needsGlobalObject = false;
+
+    static JSC::JSValue convert(Type value)
+    {
+        return JSConverter<T>::convert(value);
+    }
+};
+
+// MARK: -
+// MARK: Floating point types
+
+template<> struct Converter<IDLFloat> : DefaultConverter<IDLFloat> {
+
+    static inline float convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::ThrowScope& scope, double number)
+    {
+        if (UNLIKELY(!std::isfinite(number)))
+            throwNonFiniteTypeError(lexicalGlobalObject, scope);
+        return static_cast<float>(number);
+    }
+
+    static float convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+    {
+        JSC::VM& vm = JSC::getVM(&lexicalGlobalObject);
+        auto scope = DECLARE_THROW_SCOPE(vm);
+        double number = value.toNumber(&lexicalGlobalObject);
+        RETURN_IF_EXCEPTION(scope, 0.0);
+        if (UNLIKELY(number < std::numeric_limits<float>::lowest() || number > std::numeric_limits<float>::max()))
+            throwTypeError(&lexicalGlobalObject, scope, "The provided value is outside the range of a float");
+        if (UNLIKELY(!std::isfinite(number)))
+            throwNonFiniteTypeError(lexicalGlobalObject, scope);
+        return static_cast<float>(number);
+    }
+};
+
+template<> struct JSConverter<IDLFloat> {
+    using Type = typename IDLFloat::ImplementationType;
+
+    static constexpr bool needsState = false;
+    static constexpr bool needsGlobalObject = false;
+
+    static JSC::JSValue convert(Type value)
+    {
+        return JSC::jsNumber(value);
+    }
+};
+
+template<> struct Converter<IDLUnrestrictedFloat> : DefaultConverter<IDLUnrestrictedFloat> {
+    static inline float convert(JSC::JSGlobalObject&, JSC::ThrowScope&, double number)
+    {
+        return static_cast<float>(number);
+    }
+
+    static float convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+    {
+        JSC::VM& vm = JSC::getVM(&lexicalGlobalObject);
+        auto scope = DECLARE_THROW_SCOPE(vm);
+        double number = value.toNumber(&lexicalGlobalObject);
+        RETURN_IF_EXCEPTION(scope, 0.0);
+
+        if (UNLIKELY(number < std::numeric_limits<float>::lowest()))
+            return -std::numeric_limits<float>::infinity();
+        if (UNLIKELY(number > std::numeric_limits<float>::max()))
+            return std::numeric_limits<float>::infinity();
+        return static_cast<float>(number);
+    }
+};
+
+template<> struct JSConverter<IDLUnrestrictedFloat> {
+    using Type = typename IDLUnrestrictedFloat::ImplementationType;
+
+    static constexpr bool needsState = false;
+    static constexpr bool needsGlobalObject = false;
+
+    static JSC::JSValue convert(Type value)
+    {
+        return JSC::jsNumber(value);
+    }
+};
+
+template<> struct Converter<IDLDouble> : DefaultConverter<IDLDouble> {
+    static inline double convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::ThrowScope& scope, double number)
+    {
+        if (UNLIKELY(!std::isfinite(number)))
+            throwNonFiniteTypeError(lexicalGlobalObject, scope);
+        return number;
+    }
+
+    static double convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+    {
+        JSC::VM& vm = JSC::getVM(&lexicalGlobalObject);
+        auto scope = DECLARE_THROW_SCOPE(vm);
+        double number = value.toNumber(&lexicalGlobalObject);
+        RETURN_IF_EXCEPTION(scope, 0.0);
+        if (UNLIKELY(!std::isfinite(number)))
+            throwNonFiniteTypeError(lexicalGlobalObject, scope);
+        return number;
+    }
+};
+
+template<> struct JSConverter<IDLDouble> {
+    using Type = typename IDLDouble::ImplementationType;
+
+    static constexpr bool needsState = false;
+    static constexpr bool needsGlobalObject = false;
+
+    static JSC::JSValue convert(Type value)
+    {
+        ASSERT(!std::isnan(value));
+        return JSC::jsNumber(value);
+    }
+};
+
+template<> struct Converter<IDLUnrestrictedDouble> : DefaultConverter<IDLUnrestrictedDouble> {
+    static inline double convert(JSC::JSGlobalObject&, JSC::ThrowScope&, double number)
+    {
+        return number;
+    }
+
+    static double convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+    {
+        return value.toNumber(&lexicalGlobalObject);
+    }
+};
+
+template<> struct JSConverter<IDLUnrestrictedDouble> {
+    using Type = typename IDLUnrestrictedDouble::ImplementationType;
+
+    static constexpr bool needsState = false;
+    static constexpr bool needsGlobalObject = false;
+
+    static JSC::JSValue convert(Type value)
+    {
+        return JSC::jsNumber(JSC::purifyNaN(value));
+    }
+
+    // Add overload for MediaTime.
+    static JSC::JSValue convert(const MediaTime& value)
+    {
+        return JSC::jsNumber(JSC::purifyNaN(value.toDouble()));
+    }
+};
+
+} // namespace WebCore
diff --git a/src/javascript/jsc/bindings/webcore/JSDOMConvertObject.h b/src/javascript/jsc/bindings/webcore/JSDOMConvertObject.h
new file mode 100644
index 000000000..24dacac9e
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/JSDOMConvertObject.h
@@ -0,0 +1,63 @@
+/*
+ * Copyright (C) 2016 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "IDLTypes.h"
+#include "JSDOMConvertBase.h"
+#include "JavaScriptCore/StrongInlines.h"
+
+namespace WebCore {
+
+template<> struct Converter<IDLObject> : DefaultConverter<IDLObject> {
+
+    static constexpr bool conversionHasSideEffects = false;
+
+    template<typename ExceptionThrower = DefaultExceptionThrower>
+    static JSC::Strong<JSC::JSObject> convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value, ExceptionThrower&& exceptionThrower = ExceptionThrower())
+    {
+        JSC::VM& vm = JSC::getVM(&lexicalGlobalObject);
+        auto scope = DECLARE_THROW_SCOPE(vm);
+
+        if (!value.isObject()) {
+            exceptionThrower(lexicalGlobalObject, scope);
+            return {};
+        }
+
+        return { vm, JSC::asObject(value) };
+    }
+};
+
+template<> struct JSConverter<IDLObject> {
+    static constexpr bool needsState = false;
+    static constexpr bool needsGlobalObject = false;
+
+    static JSC::JSValue convert(const JSC::Strong<JSC::JSObject>& value)
+    {
+        return value.get();
+    }
+};
+
+} // namespace WebCore
diff --git a/src/javascript/jsc/bindings/webcore/JSDOMConvertPromise.h b/src/javascript/jsc/bindings/webcore/JSDOMConvertPromise.h
new file mode 100644
index 000000000..a0051c383
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/JSDOMConvertPromise.h
@@ -0,0 +1,87 @@
+/*
+ * Copyright (C) 2017 Yusuke Suzuki <utatane.tea@gmail.com>.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "IDLTypes.h"
+#include "JSDOMConvertBase.h"
+#include "JSDOMPromise.h"
+#include "WorkerGlobalScope.h"
+
+namespace WebCore {
+
+template<typename T> struct Converter<IDLPromise<T>> : DefaultConverter<IDLPromise<T>> {
+    using ReturnType = RefPtr<DOMPromise>;
+
+    // https://webidl.spec.whatwg.org/#es-promise
+    template<typename ExceptionThrower = DefaultExceptionThrower>
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value, ExceptionThrower&& exceptionThrower = ExceptionThrower())
+    {
+        JSC::VM& vm = JSC::getVM(&lexicalGlobalObject);
+        auto scope = DECLARE_THROW_SCOPE(vm);
+        auto* globalObject = JSC::jsDynamicCast<JSDOMGlobalObject*>(vm, &lexicalGlobalObject);
+        if (!globalObject)
+            return nullptr;
+
+        // 1. Let resolve be the original value of %Promise%.resolve.
+        // 2. Let promise be the result of calling resolve with %Promise% as the this value and V as the single argument value.
+        auto* promise = JSC::JSPromise::resolvedPromise(globalObject, value);
+        if (scope.exception()) {
+            auto* scriptExecutionContext = globalObject->scriptExecutionContext();
+            if (is<WorkerGlobalScope>(scriptExecutionContext)) {
+                auto* scriptController = downcast<WorkerGlobalScope>(*scriptExecutionContext).script();
+                bool terminatorCausedException = vm.isTerminationException(scope.exception());
+                if (terminatorCausedException || (scriptController && scriptController->isTerminatingExecution())) {
+                    scriptController->forbidExecution();
+                    return nullptr;
+                }
+            }
+            exceptionThrower(lexicalGlobalObject, scope);
+            return nullptr;
+        }
+        ASSERT(promise);
+
+        // 3. Return the IDL promise type value that is a reference to the same object as promise.
+        return DOMPromise::create(*globalObject, *promise);
+    }
+};
+
+template<typename T> struct JSConverter<IDLPromise<T>> {
+    static constexpr bool needsState = true;
+    static constexpr bool needsGlobalObject = true;
+
+    static JSC::JSValue convert(JSC::JSGlobalObject&, JSDOMGlobalObject&, DOMPromise& promise)
+    {
+        return promise.promise();
+    }
+
+    template<template<typename> class U>
+    static JSC::JSValue convert(JSC::JSGlobalObject& lexicalGlobalObject, JSDOMGlobalObject& globalObject, U<T>& promiseProxy)
+    {
+        return promiseProxy.promise(lexicalGlobalObject, globalObject);
+    }
+};
+
+} // namespace WebCore
diff --git a/src/javascript/jsc/bindings/webcore/JSDOMConvertRecord.h b/src/javascript/jsc/bindings/webcore/JSDOMConvertRecord.h
new file mode 100644
index 000000000..736fe7303
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/JSDOMConvertRecord.h
@@ -0,0 +1,191 @@
+/*
+ * Copyright (C) 2016-2019 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "IDLTypes.h"
+#include "JSDOMConvertStrings.h"
+#include "JSDOMGlobalObject.h"
+#include "JavaScriptCore/ObjectConstructor.h"
+
+namespace WebCore {
+
+namespace Detail {
+
+template<typename IDLStringType>
+struct IdentifierConverter;
+
+template<> struct IdentifierConverter<IDLDOMString> {
+    static String convert(JSC::JSGlobalObject& lexicalGlobalObject, const JSC::Identifier& identifier)
+    {
+        return identifierToString(lexicalGlobalObject, identifier);
+    }
+};
+
+template<> struct IdentifierConverter<IDLByteString> {
+    static String convert(JSC::JSGlobalObject& lexicalGlobalObject, const JSC::Identifier& identifier)
+    {
+        return identifierToByteString(lexicalGlobalObject, identifier);
+    }
+};
+
+template<> struct IdentifierConverter<IDLUSVString> {
+    static String convert(JSC::JSGlobalObject& lexicalGlobalObject, const JSC::Identifier& identifier)
+    {
+        return identifierToUSVString(lexicalGlobalObject, identifier);
+    }
+};
+
+}
+
+template<typename K, typename V> struct Converter<IDLRecord<K, V>> : DefaultConverter<IDLRecord<K, V>> {
+    using ReturnType = typename IDLRecord<K, V>::ImplementationType;
+    using KeyType = typename K::ImplementationType;
+    using ValueType = typename V::ImplementationType;
+
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value, JSDOMGlobalObject& globalObject)
+    {
+        return convertRecord<JSDOMGlobalObject&>(lexicalGlobalObject, value, globalObject);
+    }
+
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+    {
+        return convertRecord(lexicalGlobalObject, value);
+    }
+
+private:
+    template<class... Args>
+    static ReturnType convertRecord(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value, Args... args)
+    {
+        auto& vm = JSC::getVM(&lexicalGlobalObject);
+        auto scope = DECLARE_THROW_SCOPE(vm);
+
+        // 1. Let result be a new empty instance of record<K, V>.
+        // 2. If Type(O) is Undefined or Null, return result.
+        if (value.isUndefinedOrNull())
+            return {};
+
+        // 3. If Type(O) is not Object, throw a TypeError.
+        if (!value.isObject()) {
+            throwTypeError(&lexicalGlobalObject, scope);
+            return {};
+        }
+
+        JSC::JSObject* object = JSC::asObject(value);
+
+        ReturnType result;
+        HashMap<KeyType, size_t> resultMap;
+
+        // 4. Let keys be ? O.[[OwnPropertyKeys]]().
+        JSC::PropertyNameArray keys(vm, JSC::PropertyNameMode::StringsAndSymbols, JSC::PrivateSymbolMode::Exclude);
+        object->methodTable(vm)->getOwnPropertyNames(object, &lexicalGlobalObject, keys, JSC::DontEnumPropertiesMode::Include);
+        RETURN_IF_EXCEPTION(scope, {});
+
+        // 5. Repeat, for each element key of keys in List order:
+        for (auto& key : keys) {
+            // 1. Let desc be ? O.[[GetOwnProperty]](key).
+            JSC::PropertySlot slot(object, JSC::PropertySlot::InternalMethodType::GetOwnProperty);
+            bool hasProperty = object->methodTable(vm)->getOwnPropertySlot(object, &lexicalGlobalObject, key, slot);
+            RETURN_IF_EXCEPTION(scope, {});
+
+            // 2. If desc is not undefined and desc.[[Enumerable]] is true:
+
+            // It's necessary to filter enumerable here rather than using DontEnumPropertiesMode::Exclude,
+            // to prevent an observable extra [[GetOwnProperty]] operation in the case of ProxyObject records.
+            if (hasProperty && !(slot.attributes() & JSC::PropertyAttribute::DontEnum)) {
+                // 1. Let typedKey be key converted to an IDL value of type K.
+                auto typedKey = Detail::IdentifierConverter<K>::convert(lexicalGlobalObject, key);
+                RETURN_IF_EXCEPTION(scope, {});
+
+                // 2. Let value be ? Get(O, key).
+                JSC::JSValue subValue;
+                if (LIKELY(!slot.isTaintedByOpaqueObject()))
+                    subValue = slot.getValue(&lexicalGlobalObject, key);
+                else
+                    subValue = object->get(&lexicalGlobalObject, key);
+                RETURN_IF_EXCEPTION(scope, {});
+
+                // 3. Let typedValue be value converted to an IDL value of type V.
+                auto typedValue = Converter<V>::convert(lexicalGlobalObject, subValue, args...);
+                RETURN_IF_EXCEPTION(scope, {});
+
+                // 4. Set result[typedKey] to typedValue.
+                // Note: It's possible that typedKey is already in result if K is USVString and key contains unpaired surrogates.
+                if constexpr (std::is_same_v<K, IDLUSVString>) {
+                    if (!typedKey.is8Bit()) {
+                        auto addResult = resultMap.add(typedKey, result.size());
+                        if (!addResult.isNewEntry) {
+                            ASSERT(result[addResult.iterator->value].key == typedKey);
+                            result[addResult.iterator->value].value = WTFMove(typedValue);
+                            continue;
+                        }
+                    }
+                } else
+                    UNUSED_VARIABLE(resultMap);
+
+                // 5. Otherwise, append to result a mapping (typedKey, typedValue).
+                result.append({ WTFMove(typedKey), WTFMove(typedValue) });
+            }
+        }
+
+        // 6. Return result.
+        return result;
+    }
+};
+
+template<typename K, typename V> struct JSConverter<IDLRecord<K, V>> {
+    static constexpr bool needsState = true;
+    static constexpr bool needsGlobalObject = true;
+
+    template<typename MapType>
+    static JSC::JSValue convert(JSC::JSGlobalObject& lexicalGlobalObject, JSDOMGlobalObject& globalObject, const MapType& map)
+    {
+        auto& vm = JSC::getVM(&lexicalGlobalObject);
+
+        // 1. Let result be ! ObjectCreate(%ObjectPrototype%).
+        auto result = constructEmptyObject(&lexicalGlobalObject, globalObject.objectPrototype());
+
+        // 2. Repeat, for each mapping (key, value) in D:
+        for (const auto& keyValuePair : map) {
+            // 1. Let esKey be key converted to an ECMAScript value.
+            // Note, this step is not required, as we need the key to be
+            // an Identifier, not a JSValue.
+
+            // 2. Let esValue be value converted to an ECMAScript value.
+            auto esValue = toJS<V>(lexicalGlobalObject, globalObject, keyValuePair.value);
+
+            // 3. Let created be ! CreateDataProperty(result, esKey, esValue).
+            bool created = result->putDirect(vm, JSC::Identifier::fromString(vm, keyValuePair.key), esValue);
+
+            // 4. Assert: created is true.
+            ASSERT_UNUSED(created, created);
+        }
+
+        // 3. Return result.
+        return result;
+    }
+};
+
+} // namespace WebCore
diff --git a/src/javascript/jsc/bindings/webcore/JSDOMConvertScheduledAction.h b/src/javascript/jsc/bindings/webcore/JSDOMConvertScheduledAction.h
new file mode 100644
index 000000000..85a7fd6ab
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/JSDOMConvertScheduledAction.h
@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2017 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "IDLTypes.h"
+#include "JSDOMConvertBase.h"
+#include "JSDOMConvertStrings.h"
+#include "ScheduledAction.h"
+
+namespace WebCore {
+
+template<> struct Converter<IDLScheduledAction> : DefaultConverter<IDLScheduledAction> {
+    static std::unique_ptr<ScheduledAction> convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value, JSDOMGlobalObject& globalObject)
+    {
+        JSC::VM& vm = JSC::getVM(&lexicalGlobalObject);
+        auto scope = DECLARE_THROW_SCOPE(vm);
+
+        if (!value.isCallable(vm)) {
+            auto code = Converter<IDLDOMString>::convert(lexicalGlobalObject, value);
+            RETURN_IF_EXCEPTION(scope, nullptr);
+            return ScheduledAction::create(globalObject.world(), WTFMove(code));
+        }
+
+        // The value must be an object at this point because no non-object values are callable.
+        ASSERT(value.isObject());
+        return ScheduledAction::create(globalObject.world(), JSC::Strong<JSC::Unknown> { vm, JSC::asObject(value) });
+    }
+};
+
+}
+
diff --git a/src/javascript/jsc/bindings/webcore/JSDOMConvertSequences.h b/src/javascript/jsc/bindings/webcore/JSDOMConvertSequences.h
new file mode 100644
index 000000000..a08336f64
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/JSDOMConvertSequences.h
@@ -0,0 +1,435 @@
+/*
+ * Copyright (C) 2016-2017 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "IDLTypes.h"
+#include "JSDOMConvertBase.h"
+#include "JSDOMConvertNumbers.h"
+#include "JSDOMGlobalObject.h"
+#include "JavaScriptCore/IteratorOperations.h"
+#include "JavaScriptCore/JSArray.h"
+#include "JavaScriptCore/JSGlobalObjectInlines.h"
+#include "JavaScriptCore/ObjectConstructor.h"
+
+namespace WebCore {
+
+namespace Detail {
+
+template<typename IDLType>
+struct GenericSequenceConverter {
+    using ReturnType = Vector<typename IDLType::SequenceStorageType>;
+
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSObject* object)
+    {
+        return convert(lexicalGlobalObject, object, ReturnType());
+    }
+
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSObject* object, ReturnType&& result)
+    {
+        forEachInIterable(&lexicalGlobalObject, object, [&result](JSC::VM& vm, JSC::JSGlobalObject* lexicalGlobalObject, JSC::JSValue nextValue) {
+            auto scope = DECLARE_THROW_SCOPE(vm);
+
+            auto convertedValue = Converter<IDLType>::convert(*lexicalGlobalObject, nextValue);
+            if (UNLIKELY(scope.exception()))
+                return;
+            result.append(WTFMove(convertedValue));
+        });
+        return WTFMove(result);
+    }
+
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSObject* object, JSC::JSValue method)
+    {
+        return convert(lexicalGlobalObject, object, method, ReturnType());
+    }
+
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSObject* object, JSC::JSValue method, ReturnType&& result)
+    {
+        forEachInIterable(lexicalGlobalObject, object, method, [&result](JSC::VM& vm, JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue nextValue) {
+            auto scope = DECLARE_THROW_SCOPE(vm);
+
+            auto convertedValue = Converter<IDLType>::convert(lexicalGlobalObject, nextValue);
+            if (UNLIKELY(scope.exception()))
+                return;
+            result.append(WTFMove(convertedValue));
+        });
+        return WTFMove(result);
+    }
+};
+
+// Specialization for numeric types
+// FIXME: This is only implemented for the IDLFloatingPointTypes and IDLLong. To add
+// support for more numeric types, add an overload of Converter<IDLType>::convert that
+// takes a JSGlobalObject, ThrowScope and double as its arguments.
+template<typename IDLType>
+struct NumericSequenceConverter {
+    using GenericConverter = GenericSequenceConverter<IDLType>;
+    using ReturnType = typename GenericConverter::ReturnType;
+
+    static ReturnType convertArray(JSC::JSGlobalObject& lexicalGlobalObject, JSC::ThrowScope& scope, JSC::JSArray* array, unsigned length, JSC::IndexingType indexingType, ReturnType&& result)
+    {
+        if (indexingType == JSC::Int32Shape) {
+            for (unsigned i = 0; i < length; i++) {
+                auto indexValue = array->butterfly()->contiguousInt32().at(array, i).get();
+                ASSERT(!indexValue || indexValue.isInt32());
+                if (!indexValue)
+                    result.uncheckedAppend(0);
+                else
+                    result.uncheckedAppend(indexValue.asInt32());
+            }
+            return WTFMove(result);
+        }
+
+        ASSERT(indexingType == JSC::DoubleShape);
+        for (unsigned i = 0; i < length; i++) {
+            double doubleValue = array->butterfly()->contiguousDouble().at(array, i);
+            if (std::isnan(doubleValue))
+                result.uncheckedAppend(0);
+            else {
+                auto convertedValue = Converter<IDLType>::convert(lexicalGlobalObject, scope, doubleValue);
+                RETURN_IF_EXCEPTION(scope, {});
+
+                result.uncheckedAppend(convertedValue);
+            }
+        }
+        return WTFMove(result);
+    }
+
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+    {
+        auto& vm = JSC::getVM(&lexicalGlobalObject);
+        auto scope = DECLARE_THROW_SCOPE(vm);
+
+        if (!value.isObject()) {
+            throwSequenceTypeError(lexicalGlobalObject, scope);
+            return {};
+        }
+
+        JSC::JSObject* object = JSC::asObject(value);
+        if (!JSC::isJSArray(object))
+            RELEASE_AND_RETURN(scope, GenericConverter::convert(lexicalGlobalObject, object));
+
+        JSC::JSArray* array = JSC::asArray(object);
+        if (!array->isIteratorProtocolFastAndNonObservable())
+            RELEASE_AND_RETURN(scope, GenericConverter::convert(lexicalGlobalObject, object));
+
+        unsigned length = array->length();
+        ReturnType result;
+        // If we're not an int32/double array, it's possible that converting a
+        // JSValue to a number could cause the iterator protocol to change, hence,
+        // we may need more capacity, or less. In such cases, we use the length
+        // as a proxy for the capacity we will most likely need (it's unlikely that
+        // a program is written with a valueOf that will augment the iterator protocol).
+        // If we are an int32/double array, then length is precisely the capacity we need.
+        if (!result.tryReserveCapacity(length)) {
+            // FIXME: Is the right exception to throw?
+            throwTypeError(&lexicalGlobalObject, scope);
+            return {};
+        }
+
+        JSC::IndexingType indexingType = array->indexingType() & JSC::IndexingShapeMask;
+        if (indexingType != JSC::Int32Shape && indexingType != JSC::DoubleShape)
+            RELEASE_AND_RETURN(scope, GenericConverter::convert(lexicalGlobalObject, object, WTFMove(result)));
+
+        return convertArray(lexicalGlobalObject, scope, array, length, indexingType, WTFMove(result));
+    }
+
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSObject* object, JSC::JSValue method)
+    {
+        auto& vm = JSC::getVM(&lexicalGlobalObject);
+        auto scope = DECLARE_THROW_SCOPE(vm);
+
+        if (!JSC::isJSArray(object))
+            RELEASE_AND_RETURN(scope, GenericConverter::convert(lexicalGlobalObject, object, method));
+
+        JSC::JSArray* array = JSC::asArray(object);
+        if (!array->isIteratorProtocolFastAndNonObservable())
+            RELEASE_AND_RETURN(scope, GenericConverter::convert(lexicalGlobalObject, object, method));
+
+        unsigned length = array->length();
+        ReturnType result;
+        // If we're not an int32/double array, it's possible that converting a
+        // JSValue to a number could cause the iterator protocol to change, hence,
+        // we may need more capacity, or less. In such cases, we use the length
+        // as a proxy for the capacity we will most likely need (it's unlikely that
+        // a program is written with a valueOf that will augment the iterator protocol).
+        // If we are an int32/double array, then length is precisely the capacity we need.
+        if (!result.tryReserveCapacity(length)) {
+            // FIXME: Is the right exception to throw?
+            throwTypeError(&lexicalGlobalObject, scope);
+            return {};
+        }
+
+        JSC::IndexingType indexingType = array->indexingType() & JSC::IndexingShapeMask;
+        if (indexingType != JSC::Int32Shape && indexingType != JSC::DoubleShape)
+            RELEASE_AND_RETURN(scope, GenericConverter::convert(lexicalGlobalObject, object, method, WTFMove(result)));
+
+        return convertArray(lexicalGlobalObject, scope, array, length, indexingType, WTFMove(result));
+    }
+};
+
+template<typename IDLType>
+struct SequenceConverter {
+    using GenericConverter = GenericSequenceConverter<IDLType>;
+    using ReturnType = typename GenericConverter::ReturnType;
+
+    static ReturnType convertArray(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSArray* array)
+    {
+        auto& vm = lexicalGlobalObject.vm();
+        auto scope = DECLARE_THROW_SCOPE(vm);
+        unsigned length = array->length();
+
+        ReturnType result;
+        if (!result.tryReserveCapacity(length)) {
+            // FIXME: Is the right exception to throw?
+            throwTypeError(&lexicalGlobalObject, scope);
+            return {};
+        }
+
+        JSC::IndexingType indexingType = array->indexingType() & JSC::IndexingShapeMask;
+
+        if (indexingType == JSC::ContiguousShape) {
+            for (unsigned i = 0; i < length; i++) {
+                auto indexValue = array->butterfly()->contiguous().at(array, i).get();
+                if (!indexValue)
+                    indexValue = JSC::jsUndefined();
+
+                auto convertedValue = Converter<IDLType>::convert(lexicalGlobalObject, indexValue);
+                RETURN_IF_EXCEPTION(scope, {});
+
+                result.uncheckedAppend(convertedValue);
+            }
+            return result;
+        }
+
+        for (unsigned i = 0; i < length; i++) {
+            auto indexValue = array->getDirectIndex(&lexicalGlobalObject, i);
+            RETURN_IF_EXCEPTION(scope, {});
+
+            if (!indexValue)
+                indexValue = JSC::jsUndefined();
+
+            auto convertedValue = Converter<IDLType>::convert(lexicalGlobalObject, indexValue);
+            RETURN_IF_EXCEPTION(scope, {});
+
+            result.uncheckedAppend(convertedValue);
+        }
+        return result;
+    }
+
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+    {
+        auto& vm = JSC::getVM(&lexicalGlobalObject);
+        auto scope = DECLARE_THROW_SCOPE(vm);
+
+        if (!value.isObject()) {
+            throwSequenceTypeError(lexicalGlobalObject, scope);
+            return {};
+        }
+
+        JSC::JSObject* object = JSC::asObject(value);
+        if (Converter<IDLType>::conversionHasSideEffects)
+            RELEASE_AND_RETURN(scope, (GenericConverter::convert(lexicalGlobalObject, object)));
+
+        if (!JSC::isJSArray(object))
+            RELEASE_AND_RETURN(scope, (GenericConverter::convert(lexicalGlobalObject, object)));
+
+        JSC::JSArray* array = JSC::asArray(object);
+        if (!array->isIteratorProtocolFastAndNonObservable())
+            RELEASE_AND_RETURN(scope, (GenericConverter::convert(lexicalGlobalObject, object)));
+
+        RELEASE_AND_RETURN(scope, (convertArray(lexicalGlobalObject, array)));
+    }
+
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSObject* object, JSC::JSValue method)
+    {
+        if (Converter<IDLType>::conversionHasSideEffects)
+            return GenericConverter::convert(lexicalGlobalObject, object, method);
+
+        if (!JSC::isJSArray(object))
+            return GenericConverter::convert(lexicalGlobalObject, object, method);
+
+        JSC::JSArray* array = JSC::asArray(object);
+        if (!array->isIteratorProtocolFastAndNonObservable())
+            return GenericConverter::convert(lexicalGlobalObject, object, method);
+
+        return convertArray(lexicalGlobalObject, array);
+    }
+};
+
+template<>
+struct SequenceConverter<IDLLong> {
+    using ReturnType = typename GenericSequenceConverter<IDLLong>::ReturnType;
+
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+    {
+        return NumericSequenceConverter<IDLLong>::convert(lexicalGlobalObject, value);
+    }
+
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSObject* object, JSC::JSValue method)
+    {
+        return NumericSequenceConverter<IDLLong>::convert(lexicalGlobalObject, object, method);
+    }
+};
+
+template<>
+struct SequenceConverter<IDLFloat> {
+    using ReturnType = typename GenericSequenceConverter<IDLFloat>::ReturnType;
+
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+    {
+        return NumericSequenceConverter<IDLFloat>::convert(lexicalGlobalObject, value);
+    }
+
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSObject* object, JSC::JSValue method)
+    {
+        return NumericSequenceConverter<IDLFloat>::convert(lexicalGlobalObject, object, method);
+    }
+};
+
+template<>
+struct SequenceConverter<IDLUnrestrictedFloat> {
+    using ReturnType = typename GenericSequenceConverter<IDLUnrestrictedFloat>::ReturnType;
+
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+    {
+        return NumericSequenceConverter<IDLUnrestrictedFloat>::convert(lexicalGlobalObject, value);
+    }
+
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSObject* object, JSC::JSValue method)
+    {
+        return NumericSequenceConverter<IDLUnrestrictedFloat>::convert(lexicalGlobalObject, object, method);
+    }
+};
+
+template<>
+struct SequenceConverter<IDLDouble> {
+    using ReturnType = typename GenericSequenceConverter<IDLDouble>::ReturnType;
+
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+    {
+        return NumericSequenceConverter<IDLDouble>::convert(lexicalGlobalObject, value);
+    }
+
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSObject* object, JSC::JSValue method)
+    {
+        return NumericSequenceConverter<IDLDouble>::convert(lexicalGlobalObject, object, method);
+    }
+};
+
+template<>
+struct SequenceConverter<IDLUnrestrictedDouble> {
+    using ReturnType = typename GenericSequenceConverter<IDLUnrestrictedDouble>::ReturnType;
+
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+    {
+        return NumericSequenceConverter<IDLUnrestrictedDouble>::convert(lexicalGlobalObject, value);
+    }
+
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSObject* object, JSC::JSValue method)
+    {
+        return NumericSequenceConverter<IDLUnrestrictedDouble>::convert(lexicalGlobalObject, object, method);
+    }
+};
+
+}
+
+template<typename T> struct Converter<IDLSequence<T>> : DefaultConverter<IDLSequence<T>> {
+    using ReturnType = typename Detail::SequenceConverter<T>::ReturnType;
+
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+    {
+        return Detail::SequenceConverter<T>::convert(lexicalGlobalObject, value);
+    }
+
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSObject* object, JSC::JSValue method)
+    {
+        return Detail::SequenceConverter<T>::convert(lexicalGlobalObject, object, method);
+    }
+};
+
+template<typename T> struct JSConverter<IDLSequence<T>> {
+    static constexpr bool needsState = true;
+    static constexpr bool needsGlobalObject = true;
+
+    template<typename U, size_t inlineCapacity>
+    static JSC::JSValue convert(JSC::JSGlobalObject& lexicalGlobalObject, JSDOMGlobalObject& globalObject, const Vector<U, inlineCapacity>& vector)
+    {
+        JSC::VM& vm = JSC::getVM(&lexicalGlobalObject);
+        auto scope = DECLARE_THROW_SCOPE(vm);
+        JSC::MarkedArgumentBuffer list;
+        for (auto& element : vector) {
+            auto jsValue = toJS<T>(lexicalGlobalObject, globalObject, element);
+            RETURN_IF_EXCEPTION(scope, {});
+            list.append(jsValue);
+        }
+        if (UNLIKELY(list.hasOverflowed())) {
+            throwOutOfMemoryError(&lexicalGlobalObject, scope);
+            return {};
+        }
+        RELEASE_AND_RETURN(scope, JSC::constructArray(&globalObject, static_cast<JSC::ArrayAllocationProfile*>(nullptr), list));
+    }
+};
+
+template<typename T> struct Converter<IDLFrozenArray<T>> : DefaultConverter<IDLFrozenArray<T>> {
+    using ReturnType = typename Detail::SequenceConverter<T>::ReturnType;
+
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+    {
+        return Detail::SequenceConverter<T>::convert(lexicalGlobalObject, value);
+    }
+
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSObject* object, JSC::JSValue method)
+    {
+        return Detail::SequenceConverter<T>::convert(lexicalGlobalObject, object, method);
+    }
+};
+
+template<typename T> struct JSConverter<IDLFrozenArray<T>> {
+    static constexpr bool needsState = true;
+    static constexpr bool needsGlobalObject = true;
+
+    template<typename U, size_t inlineCapacity>
+    static JSC::JSValue convert(JSC::JSGlobalObject& lexicalGlobalObject, JSDOMGlobalObject& globalObject, const Vector<U, inlineCapacity>& vector)
+    {
+        JSC::VM& vm = JSC::getVM(&lexicalGlobalObject);
+        auto scope = DECLARE_THROW_SCOPE(vm);
+        JSC::MarkedArgumentBuffer list;
+        for (auto& element : vector) {
+            auto jsValue = toJS<T>(lexicalGlobalObject, globalObject, element);
+            RETURN_IF_EXCEPTION(scope, {});
+            list.append(jsValue);
+        }
+        if (UNLIKELY(list.hasOverflowed())) {
+            throwOutOfMemoryError(&lexicalGlobalObject, scope);
+            return {};
+        }
+        auto* array = JSC::constructArray(&globalObject, static_cast<JSC::ArrayAllocationProfile*>(nullptr), list);
+        RETURN_IF_EXCEPTION(scope, {});
+        RELEASE_AND_RETURN(scope, JSC::objectConstructorFreeze(&lexicalGlobalObject, array));
+    }
+};
+
+} // namespace WebCore
diff --git a/src/javascript/jsc/bindings/webcore/JSDOMConvertSerializedScriptValue.h b/src/javascript/jsc/bindings/webcore/JSDOMConvertSerializedScriptValue.h
new file mode 100644
index 000000000..ba714ff67
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/JSDOMConvertSerializedScriptValue.h
@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2016 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "IDLTypes.h"
+#include "JSDOMConvertStrings.h"
+
+namespace WebCore {
+
+template<typename T> struct Converter<IDLSerializedScriptValue<T>> : DefaultConverter<IDLSerializedScriptValue<T>> {
+    static RefPtr<T> convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+    {
+        return T::create(lexicalGlobalObject, value);
+    }
+};
+
+template<typename T> struct JSConverter<IDLSerializedScriptValue<T>> {
+    static constexpr bool needsState = true;
+    static constexpr bool needsGlobalObject = true;
+
+    static JSC::JSValue convert(JSC::JSGlobalObject& lexicalGlobalObject, JSDOMGlobalObject& globalObject, RefPtr<T> value)
+    {
+        return value ? value->deserialize(lexicalGlobalObject, &globalObject) : JSC::jsNull();
+    }
+};
+
+} // namespace WebCore
diff --git a/src/javascript/jsc/bindings/webcore/JSDOMConvertStrings.cpp b/src/javascript/jsc/bindings/webcore/JSDOMConvertStrings.cpp
new file mode 100644
index 000000000..6c0a208d8
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/JSDOMConvertStrings.cpp
@@ -0,0 +1,92 @@
+/*
+ *  Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
+ *  Copyright (C) 2004-2011, 2013, 2016 Apple Inc. All rights reserved.
+ *  Copyright (C) 2007 Samuel Weinig <sam@webkit.org>
+ *  Copyright (C) 2013 Michael Pruett <michael@68k.org>
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include "config.h"
+#include "JSDOMConvertStrings.h"
+
+#include "JSDOMExceptionHandling.h"
+#include "JavaScriptCore/HeapInlines.h"
+#include "JavaScriptCore/JSCJSValueInlines.h"
+#include "wtf/text/StringBuilder.h"
+#include "wtf/unicode/CharacterNames.h"
+
+namespace WebCore {
+using namespace JSC;
+
+String identifierToString(JSGlobalObject& lexicalGlobalObject, const Identifier& identifier)
+{
+    if (UNLIKELY(identifier.isSymbol())) {
+        auto scope = DECLARE_THROW_SCOPE(lexicalGlobalObject.vm());
+        throwTypeError(&lexicalGlobalObject, scope, SymbolCoercionError);
+        return {};
+    }
+
+    return identifier.string();
+}
+
+static inline String stringToByteString(JSGlobalObject& lexicalGlobalObject, JSC::ThrowScope& scope, String&& string)
+{
+    if (!string.isAllLatin1()) {
+        throwTypeError(&lexicalGlobalObject, scope);
+        return {};
+    }
+
+    return WTFMove(string);
+}
+
+String identifierToByteString(JSGlobalObject& lexicalGlobalObject, const Identifier& identifier)
+{
+    VM& vm = lexicalGlobalObject.vm();
+    auto scope = DECLARE_THROW_SCOPE(vm);
+
+    auto string = identifierToString(lexicalGlobalObject, identifier);
+    RETURN_IF_EXCEPTION(scope, {});
+    return stringToByteString(lexicalGlobalObject, scope, WTFMove(string));
+}
+
+String valueToByteString(JSGlobalObject& lexicalGlobalObject, JSValue value)
+{
+    VM& vm = lexicalGlobalObject.vm();
+    auto scope = DECLARE_THROW_SCOPE(vm);
+
+    auto string = value.toWTFString(&lexicalGlobalObject);
+    RETURN_IF_EXCEPTION(scope, {});
+
+    return stringToByteString(lexicalGlobalObject, scope, WTFMove(string));
+}
+
+String identifierToUSVString(JSGlobalObject& lexicalGlobalObject, const Identifier& identifier)
+{
+    return replaceUnpairedSurrogatesWithReplacementCharacter(identifierToString(lexicalGlobalObject, identifier));
+}
+
+String valueToUSVString(JSGlobalObject& lexicalGlobalObject, JSValue value)
+{
+    VM& vm = lexicalGlobalObject.vm();
+    auto scope = DECLARE_THROW_SCOPE(vm);
+
+    auto string = value.toWTFString(&lexicalGlobalObject);
+    RETURN_IF_EXCEPTION(scope, {});
+
+    return replaceUnpairedSurrogatesWithReplacementCharacter(WTFMove(string));
+}
+
+} // namespace WebCore
diff --git a/src/javascript/jsc/bindings/webcore/JSDOMConvertStrings.h b/src/javascript/jsc/bindings/webcore/JSDOMConvertStrings.h
new file mode 100644
index 000000000..29fa7259a
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/JSDOMConvertStrings.h
@@ -0,0 +1,214 @@
+/*
+ * Copyright (C) 2016-2019 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "IDLTypes.h"
+#include "JSDOMConvertBase.h"
+#include "StringAdaptors.h"
+
+namespace WebCore {
+
+WEBCORE_EXPORT String identifierToString(JSC::JSGlobalObject&, const JSC::Identifier&);
+WEBCORE_EXPORT String identifierToByteString(JSC::JSGlobalObject&, const JSC::Identifier&);
+WEBCORE_EXPORT String valueToByteString(JSC::JSGlobalObject&, JSC::JSValue);
+WEBCORE_EXPORT String identifierToUSVString(JSC::JSGlobalObject&, const JSC::Identifier&);
+WEBCORE_EXPORT String valueToUSVString(JSC::JSGlobalObject&, JSC::JSValue);
+
+inline String propertyNameToString(JSC::PropertyName propertyName)
+{
+    ASSERT(!propertyName.isSymbol());
+    return propertyName.uid() ? propertyName.uid() : propertyName.publicName();
+}
+
+inline AtomString propertyNameToAtomString(JSC::PropertyName propertyName)
+{
+    return AtomString(propertyName.uid() ? propertyName.uid() : propertyName.publicName());
+}
+
+// MARK: -
+// MARK: String types
+
+template<> struct Converter<IDLDOMString> : DefaultConverter<IDLDOMString> {
+    static String convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+    {
+        return value.toWTFString(&lexicalGlobalObject);
+    }
+};
+
+template<> struct JSConverter<IDLDOMString> {
+    static constexpr bool needsState = true;
+    static constexpr bool needsGlobalObject = false;
+
+    static JSC::JSValue convert(JSC::JSGlobalObject& lexicalGlobalObject, const String& value)
+    {
+        return JSC::jsStringWithCache(JSC::getVM(&lexicalGlobalObject), value);
+    }
+
+    static JSC::JSValue convert(JSC::JSGlobalObject& lexicalGlobalObject, const UncachedString& value)
+    {
+        return JSC::jsString(JSC::getVM(&lexicalGlobalObject), value.string);
+    }
+
+    static JSC::JSValue convert(JSC::JSGlobalObject& lexicalGlobalObject, const OwnedString& value)
+    {
+        return JSC::jsOwnedString(JSC::getVM(&lexicalGlobalObject), value.string);
+    }
+
+    static JSC::JSValue convert(JSC::JSGlobalObject& lexicalGlobalObject, const URL& value)
+    {
+        return JSC::jsOwnedString(JSC::getVM(&lexicalGlobalObject), value.string());
+    }
+};
+
+template<> struct Converter<IDLByteString> : DefaultConverter<IDLByteString> {
+    static String convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+    {
+        return valueToByteString(lexicalGlobalObject, value);
+    }
+};
+
+template<> struct JSConverter<IDLByteString> {
+    static constexpr bool needsState = true;
+    static constexpr bool needsGlobalObject = false;
+
+    static JSC::JSValue convert(JSC::JSGlobalObject& lexicalGlobalObject, const String& value)
+    {
+        return JSC::jsStringWithCache(JSC::getVM(&lexicalGlobalObject), value);
+    }
+
+    static JSC::JSValue convert(JSC::JSGlobalObject& lexicalGlobalObject, const UncachedString& value)
+    {
+        return JSC::jsString(JSC::getVM(&lexicalGlobalObject), value.string);
+    }
+
+    static JSC::JSValue convert(JSC::JSGlobalObject& lexicalGlobalObject, const OwnedString& value)
+    {
+        return JSC::jsOwnedString(JSC::getVM(&lexicalGlobalObject), value.string);
+    }
+};
+
+template<> struct Converter<IDLUSVString> : DefaultConverter<IDLUSVString> {
+    static String convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+    {
+        return valueToUSVString(lexicalGlobalObject, value);
+    }
+    static JSC::JSValue convert(JSC::JSGlobalObject& lexicalGlobalObject, const URL& value)
+    {
+        return JSC::jsOwnedString(JSC::getVM(&lexicalGlobalObject), value.string());
+    }
+};
+
+template<> struct JSConverter<IDLUSVString> {
+    static constexpr bool needsState = true;
+    static constexpr bool needsGlobalObject = false;
+
+    static JSC::JSValue convert(JSC::JSGlobalObject& lexicalGlobalObject, const String& value)
+    {
+        return JSC::jsStringWithCache(JSC::getVM(&lexicalGlobalObject), value);
+    }
+
+    static JSC::JSValue convert(JSC::JSGlobalObject& lexicalGlobalObject, const UncachedString& value)
+    {
+        return JSC::jsString(JSC::getVM(&lexicalGlobalObject), value.string);
+    }
+
+    static JSC::JSValue convert(JSC::JSGlobalObject& lexicalGlobalObject, const OwnedString& value)
+    {
+        return JSC::jsOwnedString(JSC::getVM(&lexicalGlobalObject), value.string);
+    }
+
+    static JSC::JSValue convert(JSC::JSGlobalObject& lexicalGlobalObject, const URL& value)
+    {
+        return JSC::jsOwnedString(JSC::getVM(&lexicalGlobalObject), value.string());
+    }
+};
+
+// MARK: -
+// MARK: String type adaptors
+
+template<typename T> struct Converter<IDLLegacyNullToEmptyStringAdaptor<T>> : DefaultConverter<IDLLegacyNullToEmptyStringAdaptor<T>> {
+    static String convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+    {
+        if (value.isNull())
+            return emptyString();
+        return Converter<T>::convert(lexicalGlobalObject, value);
+    }
+};
+
+template<typename T>  struct JSConverter<IDLLegacyNullToEmptyStringAdaptor<T>> {
+    static constexpr bool needsState = true;
+    static constexpr bool needsGlobalObject = false;
+
+    static JSC::JSValue convert(JSC::JSGlobalObject& lexicalGlobalObject, const String& value)
+    {
+        return JSConverter<T>::convert(lexicalGlobalObject, value);
+    }
+};
+
+template<typename T> struct Converter<IDLAtomStringAdaptor<T>> : DefaultConverter<IDLAtomStringAdaptor<T>> {
+    static AtomString convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+    {
+        static_assert(std::is_same<T, IDLDOMString>::value, "This adaptor is only supported for IDLDOMString at the moment.");
+
+        return value.toString(&lexicalGlobalObject)->toAtomString(&lexicalGlobalObject);
+    }
+};
+
+template<typename T>  struct JSConverter<IDLAtomStringAdaptor<T>> {
+    static constexpr bool needsState = true;
+    static constexpr bool needsGlobalObject = false;
+
+    static JSC::JSValue convert(JSC::JSGlobalObject& lexicalGlobalObject, const AtomString& value)
+    {
+        static_assert(std::is_same<T, IDLDOMString>::value, "This adaptor is only supported for IDLDOMString at the moment.");
+
+        return JSConverter<T>::convert(lexicalGlobalObject, value);
+    }
+};
+
+template<typename T> struct Converter<IDLRequiresExistingAtomStringAdaptor<T>> : DefaultConverter<IDLRequiresExistingAtomStringAdaptor<T>> {
+    static AtomString convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+    {
+        static_assert(std::is_same<T, IDLDOMString>::value, "This adaptor is only supported for IDLDOMString at the moment.");
+    
+        return AtomString(value.toString(&lexicalGlobalObject)->toExistingAtomString(&lexicalGlobalObject));
+    }
+};
+
+template<typename T>  struct JSConverter<IDLRequiresExistingAtomStringAdaptor<T>> {
+    static constexpr bool needsState = true;
+    static constexpr bool needsGlobalObject = false;
+
+    static JSC::JSValue convert(JSC::JSGlobalObject& lexicalGlobalObject, const AtomString& value)
+    {
+        static_assert(std::is_same<T, IDLDOMString>::value, "This adaptor is only supported for IDLDOMString at the moment.");
+
+        return JSConverter<T>::convert(lexicalGlobalObject, value);
+    }
+};
+
+
+} // namespace WebCore
diff --git a/src/javascript/jsc/bindings/webcore/JSDOMConvertUnion.h b/src/javascript/jsc/bindings/webcore/JSDOMConvertUnion.h
new file mode 100644
index 000000000..db192f7f9
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/JSDOMConvertUnion.h
@@ -0,0 +1,416 @@
+/*
+ * Copyright (C) 2016-2020 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "IDLTypes.h"
+#include "JSDOMBinding.h"
+#include "JSDOMConvertBase.h"
+#include "JSDOMConvertBufferSource.h"
+#include "JSDOMConvertInterface.h"
+#include "JSDOMConvertNull.h"
+#include "JavaScriptCore/IteratorOperations.h"
+#include <variant>
+
+namespace WebCore {
+
+template<typename ReturnType, bool enabled>
+struct ConditionalReturner;
+
+template<typename ReturnType>
+struct ConditionalReturner<ReturnType, true> {
+    template<typename T>
+    static std::optional<ReturnType> get(T&& value)
+    {
+        return ReturnType(std::forward<T>(value));
+    }
+};
+
+template<typename ReturnType>
+struct ConditionalReturner<ReturnType, false> {
+    template<typename T>
+    static std::optional<ReturnType> get(T&&)
+    {
+        return std::nullopt;
+    }
+};
+
+template<typename ReturnType, typename T, bool enabled>
+struct ConditionalConverter;
+
+template<typename ReturnType, typename T>
+struct ConditionalConverter<ReturnType, T, true> {
+    static std::optional<ReturnType> convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+    {
+        return ReturnType(Converter<T>::convert(lexicalGlobalObject, value));
+    }
+};
+
+template<typename ReturnType, typename T>
+struct ConditionalConverter<ReturnType, T, false> {
+    static std::optional<ReturnType> convert(JSC::JSGlobalObject&, JSC::JSValue)
+    {
+        return std::nullopt;
+    }
+};
+
+template<typename ReturnType, typename T, bool enabled>
+struct ConditionalSequenceConverter;
+
+template<typename ReturnType, typename T>
+struct ConditionalSequenceConverter<ReturnType, T, true> {
+    static std::optional<ReturnType> convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSObject* object, JSC::JSValue method)
+    {
+        return ReturnType(Converter<T>::convert(lexicalGlobalObject, object, method));
+    }
+};
+
+template<typename ReturnType, typename T>
+struct ConditionalSequenceConverter<ReturnType, T, false> {
+    static std::optional<ReturnType> convert(JSC::JSGlobalObject&, JSC::JSObject*, JSC::JSValue)
+    {
+        return std::nullopt;
+    }
+};
+
+namespace Detail {
+
+template<typename List, bool condition>
+struct ConditionalFront;
+
+template<typename List>
+struct ConditionalFront<List, true> {
+    using type = brigand::front<List>;
+};
+
+template<typename List>
+struct ConditionalFront<List, false> {
+    using type = void;
+};
+
+}
+
+template<typename List, bool condition>
+using ConditionalFront = typename Detail::ConditionalFront<List, condition>::type;
+
+template<typename... T> struct Converter<IDLUnion<T...>> : DefaultConverter<IDLUnion<T...>> {
+    using Type = IDLUnion<T...>;
+    using TypeList = typename Type::TypeList;
+    using ReturnType = typename Type::ImplementationType;
+
+    using NumericTypeList = brigand::filter<TypeList, IsIDLNumber<brigand::_1>>;
+    static constexpr size_t numberOfNumericTypes = brigand::size<NumericTypeList>::value;
+    static_assert(numberOfNumericTypes == 0 || numberOfNumericTypes == 1, "There can be 0 or 1 numeric types in an IDLUnion.");
+    using NumericType = ConditionalFront<NumericTypeList, numberOfNumericTypes != 0>;
+
+    using StringTypeList = brigand::filter<TypeList, IsIDLStringOrEnumeration<brigand::_1>>;
+    static constexpr size_t numberOfStringTypes = brigand::size<StringTypeList>::value;
+    static_assert(numberOfStringTypes == 0 || numberOfStringTypes == 1, "There can be 0 or 1 string types in an IDLUnion.");
+    using StringType = ConditionalFront<StringTypeList, numberOfStringTypes != 0>;
+
+    using SequenceTypeList = brigand::filter<TypeList, IsIDLSequence<brigand::_1>>;
+    static constexpr size_t numberOfSequenceTypes = brigand::size<SequenceTypeList>::value;
+    static_assert(numberOfSequenceTypes == 0 || numberOfSequenceTypes == 1, "There can be 0 or 1 sequence types in an IDLUnion.");
+    using SequenceType = ConditionalFront<SequenceTypeList, numberOfSequenceTypes != 0>;
+
+    using FrozenArrayTypeList = brigand::filter<TypeList, IsIDLFrozenArray<brigand::_1>>;
+    static constexpr size_t numberOfFrozenArrayTypes = brigand::size<FrozenArrayTypeList>::value;
+    static_assert(numberOfFrozenArrayTypes == 0 || numberOfFrozenArrayTypes == 1, "There can be 0 or 1 FrozenArray types in an IDLUnion.");
+    using FrozenArrayType = ConditionalFront<FrozenArrayTypeList, numberOfFrozenArrayTypes != 0>;
+
+    using DictionaryTypeList = brigand::filter<TypeList, IsIDLDictionary<brigand::_1>>;
+    static constexpr size_t numberOfDictionaryTypes = brigand::size<DictionaryTypeList>::value;
+    static_assert(numberOfDictionaryTypes == 0 || numberOfDictionaryTypes == 1, "There can be 0 or 1 dictionary types in an IDLUnion.");
+    static constexpr bool hasDictionaryType = numberOfDictionaryTypes != 0;
+    using DictionaryType = ConditionalFront<DictionaryTypeList, hasDictionaryType>;
+
+    using RecordTypeList = brigand::filter<TypeList, IsIDLRecord<brigand::_1>>;
+    static constexpr size_t numberOfRecordTypes = brigand::size<RecordTypeList>::value;
+    static_assert(numberOfRecordTypes == 0 || numberOfRecordTypes == 1, "There can be 0 or 1 record types in an IDLUnion.");
+    static constexpr bool hasRecordType = numberOfRecordTypes != 0;
+    using RecordType = ConditionalFront<RecordTypeList, hasRecordType>;
+
+    using ObjectTypeList = brigand::filter<TypeList, std::is_same<IDLObject, brigand::_1>>;
+    static constexpr size_t numberOfObjectTypes = brigand::size<ObjectTypeList>::value;
+    static_assert(numberOfObjectTypes == 0 || numberOfObjectTypes == 1, "There can be 0 or 1 object types in an IDLUnion.");
+    static constexpr bool hasObjectType = numberOfObjectTypes != 0;
+    using ObjectType = ConditionalFront<ObjectTypeList, hasObjectType>;
+
+    static constexpr bool hasAnyObjectType = (numberOfSequenceTypes + numberOfFrozenArrayTypes + numberOfDictionaryTypes + numberOfRecordTypes + numberOfObjectTypes) > 0;
+
+    using InterfaceTypeList = brigand::filter<TypeList, IsIDLInterface<brigand::_1>>;
+    using TypedArrayTypeList = brigand::filter<TypeList, IsIDLTypedArray<brigand::_1>>;
+
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+    {
+        JSC::VM& vm = JSC::getVM(&lexicalGlobalObject);
+        auto scope = DECLARE_THROW_SCOPE(vm);
+
+        // 1. If the union type includes a nullable type and V is null or undefined, then return the IDL value null.
+        constexpr bool hasNullType = brigand::any<TypeList, std::is_same<IDLNull, brigand::_1>>::value;
+        if (hasNullType) {
+            if (value.isUndefinedOrNull())
+                RELEASE_AND_RETURN(scope, (ConditionalConverter<ReturnType, IDLNull, hasNullType>::convert(lexicalGlobalObject, value).value()));
+        }
+
+        // 2. Let types be the flattened member types of the union type.
+        // NOTE: Union is expected to be pre-flattented.
+
+        // 3. If V is null or undefined then:
+        if (hasDictionaryType) {
+            if (value.isUndefinedOrNull()) {
+                //     1. If types includes a dictionary type, then return the result of converting V to that dictionary type.
+                RELEASE_AND_RETURN(scope, (ConditionalConverter<ReturnType, DictionaryType, hasDictionaryType>::convert(lexicalGlobalObject, value).value()));
+            }
+        }
+
+        // 4. If V is a platform object, then:
+        //     1. If types includes an interface type that V implements, then return the IDL value that is a reference to the object V.
+        //     2. If types includes object, then return the IDL value that is a reference to the object V.
+        //         (FIXME: Add support for object and step 4.2)
+        if (brigand::any<TypeList, IsIDLInterface<brigand::_1>>::value) {
+            std::optional<ReturnType> returnValue;
+            brigand::for_each<InterfaceTypeList>([&](auto&& type) {
+                if (returnValue)
+                    return;
+
+                using Type = typename WTF::RemoveCVAndReference<decltype(type)>::type::type;
+                using ImplementationType = typename Type::ImplementationType;
+                using RawType = typename Type::RawType;
+
+                auto castedValue = JSToWrappedOverloader<RawType>::toWrapped(lexicalGlobalObject, value);
+                if (!castedValue)
+                    return;
+
+                returnValue = ReturnType(ImplementationType(castedValue));
+            });
+
+            if (returnValue)
+                return WTFMove(returnValue.value());
+        }
+
+        // FIXME: Add support for steps 5 & 6.
+        //
+        // 5. If V is a DOMException platform object, then:
+        //     1. If types includes DOMException or Error, then return the result of converting V to that type.
+        //     2 If types includes object, then return the IDL value that is a reference to the object V.
+        //
+        // 6. If Type(V) is Object and V has an [[ErrorData]] internal slot), then:
+        //     1. If types includes Error, then return the result of converting V to Error.
+        //     2. If types includes object, then return the IDL value that is a reference to the object V.
+
+        // 7. If Type(V) is Object and V has an [[ArrayBufferData]] internal slot, then:
+        //     1. If types includes ArrayBuffer, then return the result of converting V to ArrayBuffer.
+        //     2. If types includes object, then return the IDL value that is a reference to the object V.
+        constexpr bool hasArrayBufferType = brigand::any<TypeList, IsIDLArrayBuffer<brigand::_1>>::value;
+        if (hasArrayBufferType || hasObjectType) {
+            auto arrayBuffer = (brigand::any<TypeList, IsIDLArrayBufferAllowShared<brigand::_1>>::value) ? JSC::JSArrayBuffer::toWrappedAllowShared(vm, value) : JSC::JSArrayBuffer::toWrapped(vm, value);
+            if (arrayBuffer) {
+                if (hasArrayBufferType)
+                    return ConditionalReturner<ReturnType, hasArrayBufferType>::get(WTFMove(arrayBuffer)).value();
+                RELEASE_AND_RETURN(scope, (ConditionalConverter<ReturnType, ObjectType, hasObjectType>::convert(lexicalGlobalObject, value).value()));
+            }
+        }
+
+        constexpr bool hasArrayBufferViewType = brigand::any<TypeList, IsIDLArrayBufferView<brigand::_1>>::value;
+        if (hasArrayBufferViewType || hasObjectType) {
+            auto arrayBufferView = (brigand::any<TypeList, IsIDLArrayBufferViewAllowShared<brigand::_1>>::value) ? JSC::JSArrayBufferView::toWrappedAllowShared(vm, value) : JSC::JSArrayBufferView::toWrapped(vm, value);
+            if (arrayBufferView) {
+                if (hasArrayBufferViewType)
+                    return ConditionalReturner<ReturnType, hasArrayBufferViewType>::get(WTFMove(arrayBufferView)).value();
+                RELEASE_AND_RETURN(scope, (ConditionalConverter<ReturnType, ObjectType, hasObjectType>::convert(lexicalGlobalObject, value).value()));
+            }
+        }
+
+        // 8. If Type(V) is Object and V has a [[DataView]] internal slot, then:
+        //     1. If types includes DataView, then return the result of converting V to DataView.
+        //     2. If types includes object, then return the IDL value that is a reference to the object V.
+        constexpr bool hasDataViewType = brigand::any<TypeList, std::is_same<IDLDataView, brigand::_1>>::value;
+        if (hasDataViewType || hasObjectType) {
+            auto dataView = JSC::JSDataView::toWrapped(vm, value);
+            if (dataView) {
+                if (hasDataViewType)
+                    return ConditionalReturner<ReturnType, hasDataViewType>::get(WTFMove(dataView)).value();
+                RELEASE_AND_RETURN(scope, (ConditionalConverter<ReturnType, ObjectType, hasObjectType>::convert(lexicalGlobalObject, value).value()));
+            }
+        }
+
+        // 9. If Type(V) is Object and V has a [[TypedArrayName]] internal slot, then:
+        //     1. If types includes a typed array type whose name is the value of V’s [[TypedArrayName]] internal slot, then return the result of converting V to that type.
+        //     2. If types includes object, then return the IDL value that is a reference to the object V.
+        //         (FIXME: Add support for object and step 9.2)
+        constexpr bool hasTypedArrayType = brigand::any<TypeList, IsIDLTypedArray<brigand::_1>>::value;
+        if (hasTypedArrayType) {
+            std::optional<ReturnType> returnValue;
+            brigand::for_each<TypedArrayTypeList>([&](auto&& type) {
+                if (returnValue)
+                    return;
+
+                using Type = typename WTF::RemoveCVAndReference<decltype(type)>::type::type;
+                using ImplementationType = typename Type::ImplementationType;
+                using WrapperType = typename Converter<Type>::WrapperType;
+
+                auto castedValue = (brigand::any<TypeList, IsIDLTypedArrayAllowShared<brigand::_1>>::value) ? WrapperType::toWrappedAllowShared(vm, value) : WrapperType::toWrapped(vm, value);
+                if (!castedValue)
+                    return;
+
+                returnValue = ReturnType(ImplementationType(castedValue));
+            });
+
+            if (returnValue)
+                return WTFMove(returnValue.value());
+        }
+
+        // FIXME: Add support for step 10.
+        //
+        // 10. If IsCallable(V) is true, then:
+        //     1. If types includes a callback function type, then return the result of converting V to that callback function type.
+        //     2. If types includes object, then return the IDL value that is a reference to the object V.
+
+        // 11. If V is any kind of object, then:
+        if (hasAnyObjectType) {
+            if (value.isCell()) {
+                JSC::JSCell* cell = value.asCell();
+                if (cell->isObject()) {
+                    auto object = asObject(value);
+
+                    //     1. If types includes a sequence type, then:
+                    //         1. Let method be the result of GetMethod(V, @@iterator).
+                    //         2. ReturnIfAbrupt(method).
+                    //         3. If method is not undefined, return the result of creating a
+                    //            sequence of that type from V and method.
+                    constexpr bool hasSequenceType = numberOfSequenceTypes != 0;
+                    if (hasSequenceType) {
+                        auto method = JSC::iteratorMethod(&lexicalGlobalObject, object);
+                        RETURN_IF_EXCEPTION(scope, ReturnType());
+                        if (!method.isUndefined())
+                            RELEASE_AND_RETURN(scope, (ConditionalSequenceConverter<ReturnType, SequenceType, hasSequenceType>::convert(lexicalGlobalObject, object, method).value()));
+                    }
+
+                    //     2. If types includes a frozen array type, then:
+                    //         1. Let method be the result of GetMethod(V, @@iterator).
+                    //         2. ReturnIfAbrupt(method).
+                    //         3. If method is not undefined, return the result of creating a
+                    //            frozen array of that type from V and method.
+                    constexpr bool hasFrozenArrayType = numberOfFrozenArrayTypes != 0;
+                    if (hasFrozenArrayType) {
+                        auto method = JSC::iteratorMethod(&lexicalGlobalObject, object);
+                        RETURN_IF_EXCEPTION(scope, ReturnType());
+                        if (!method.isUndefined())
+                            RELEASE_AND_RETURN(scope, (ConditionalSequenceConverter<ReturnType, FrozenArrayType, hasFrozenArrayType>::convert(lexicalGlobalObject, object, method).value()));
+                    }
+
+                    //     3. If types includes a dictionary type, then return the result of
+                    //        converting V to that dictionary type.
+                    if (hasDictionaryType)
+                        RELEASE_AND_RETURN(scope, (ConditionalConverter<ReturnType, DictionaryType, hasDictionaryType>::convert(lexicalGlobalObject, value).value()));
+
+                    //     4. If types includes a record type, then return the result of converting V to that record type.
+                    if (hasRecordType)
+                        RELEASE_AND_RETURN(scope, (ConditionalConverter<ReturnType, RecordType, hasRecordType>::convert(lexicalGlobalObject, value).value()));
+
+                    //     5. If types includes a callback interface type, then return the result of converting V to that interface type.
+                    //         (FIXME: Add support for callback interface type and step 12.5)
+
+                    //     6. If types includes object, then return the IDL value that is a reference to the object V.
+                    if (hasObjectType)
+                        RELEASE_AND_RETURN(scope, (ConditionalConverter<ReturnType, ObjectType, hasObjectType>::convert(lexicalGlobalObject, value).value()));
+                }
+            }
+        }
+
+        // 12. If V is a Boolean value, then:
+        //     1. If types includes a boolean, then return the result of converting V to boolean.
+        constexpr bool hasBooleanType = brigand::any<TypeList, std::is_same<IDLBoolean, brigand::_1>>::value;
+        if (hasBooleanType) {
+            if (value.isBoolean())
+                RELEASE_AND_RETURN(scope, (ConditionalConverter<ReturnType, IDLBoolean, hasBooleanType>::convert(lexicalGlobalObject, value).value()));
+        }
+
+        // 13. If V is a Number value, then:
+        //     1. If types includes a numeric type, then return the result of converting V to that numeric type.
+        constexpr bool hasNumericType = brigand::size<NumericTypeList>::value != 0;
+        if (hasNumericType) {
+            if (value.isNumber())
+                RELEASE_AND_RETURN(scope, (ConditionalConverter<ReturnType, NumericType, hasNumericType>::convert(lexicalGlobalObject, value).value()));
+        }
+
+        // 14. If types includes a string type, then return the result of converting V to that type.
+        constexpr bool hasStringType = brigand::size<StringTypeList>::value != 0;
+        if (hasStringType)
+            RELEASE_AND_RETURN(scope, (ConditionalConverter<ReturnType, StringType, hasStringType>::convert(lexicalGlobalObject, value).value()));
+
+        // 15. If types includes a numeric type, then return the result of converting V to that numeric type.
+        if (hasNumericType)
+            RELEASE_AND_RETURN(scope, (ConditionalConverter<ReturnType, NumericType, hasNumericType>::convert(lexicalGlobalObject, value).value()));
+
+        // 16. If types includes a boolean, then return the result of converting V to boolean.
+        if (hasBooleanType)
+            RELEASE_AND_RETURN(scope, (ConditionalConverter<ReturnType, IDLBoolean, hasBooleanType>::convert(lexicalGlobalObject, value).value()));
+
+        // 17. Throw a TypeError.
+        throwTypeError(&lexicalGlobalObject, scope);
+        return ReturnType();
+    }
+};
+
+template<typename... T> struct JSConverter<IDLUnion<T...>> {
+    using Type = IDLUnion<T...>;
+    using TypeList = typename Type::TypeList;
+    using ImplementationType = typename Type::ImplementationType;
+
+    static constexpr bool needsState = true;
+    static constexpr bool needsGlobalObject = true;
+
+    using Sequence = brigand::make_sequence<brigand::ptrdiff_t<0>, std::variant_size<ImplementationType>::value>;
+
+    static JSC::JSValue convert(JSC::JSGlobalObject& lexicalGlobalObject, JSDOMGlobalObject& globalObject, const ImplementationType& variant)
+    {
+        auto index = variant.index();
+
+        std::optional<JSC::JSValue> returnValue;
+        brigand::for_each<Sequence>([&](auto&& type) {
+            using I = typename WTF::RemoveCVAndReference<decltype(type)>::type::type;
+            if (I::value == index) {
+                ASSERT(!returnValue);
+                returnValue = toJS<brigand::at<TypeList, I>>(lexicalGlobalObject, globalObject, std::get<I::value>(variant));
+            }
+        });
+
+        ASSERT(returnValue);
+        return returnValue.value();
+    }
+};
+
+// BufferSource specialization. In WebKit, BufferSource is defined as IDLUnion<IDLArrayBufferView, IDLArrayBuffer> as a hack, and it is not compatible to
+// annotation described in WebIDL.
+template<> struct Converter<IDLAllowSharedAdaptor<IDLUnion<IDLArrayBufferView, IDLArrayBuffer>>> : DefaultConverter<IDLUnion<IDLArrayBufferView, IDLArrayBuffer>> {
+    static auto convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value) -> decltype(auto)
+    {
+        return Converter<IDLUnion<IDLAllowSharedAdaptor<IDLArrayBufferView>, IDLAllowSharedAdaptor<IDLArrayBuffer>>>::convert(lexicalGlobalObject, value);
+    }
+};
+
+} // namespace WebCore
diff --git a/src/javascript/jsc/bindings/webcore/JSDOMConvertVariadic.h b/src/javascript/jsc/bindings/webcore/JSDOMConvertVariadic.h
new file mode 100644
index 000000000..dd16b1d66
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/JSDOMConvertVariadic.h
@@ -0,0 +1,74 @@
+/*
+ * Copyright (C) 2016-2021 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "IDLTypes.h"
+#include "JSDOMConvertBase.h"
+#include "wtf/FixedVector.h"
+
+namespace WebCore {
+
+template<typename IDLType>
+struct VariadicConverter {
+    using Item = typename IDLType::ImplementationType;
+
+    static std::optional<Item> convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+    {
+        auto& vm = JSC::getVM(&lexicalGlobalObject);
+        auto scope = DECLARE_THROW_SCOPE(vm);
+
+        auto result = Converter<IDLType>::convert(lexicalGlobalObject, value);
+        RETURN_IF_EXCEPTION(scope, std::nullopt);
+
+        return result;
+    }
+};
+
+template<typename IDLType> FixedVector<typename VariadicConverter<IDLType>::Item> convertVariadicArguments(JSC::JSGlobalObject& lexicalGlobalObject, JSC::CallFrame& callFrame, size_t startIndex)
+{
+    auto& vm = JSC::getVM(&lexicalGlobalObject);
+    auto scope = DECLARE_THROW_SCOPE(vm);
+
+    size_t length = callFrame.argumentCount();
+    if (startIndex >= length)
+        return {};
+
+    FixedVector<typename VariadicConverter<IDLType>::Item> result(length - startIndex);
+
+    size_t resultIndex = 0;
+    for (size_t i = startIndex; i < length; ++i) {
+        auto value = VariadicConverter<IDLType>::convert(lexicalGlobalObject, callFrame.uncheckedArgument(i));
+        EXCEPTION_ASSERT_UNUSED(scope, !!scope.exception() == !value);
+        if (!value)
+            return {};
+        result[resultIndex] = WTFMove(*value);
+        resultIndex++;
+    }
+
+    return result;
+}
+
+} // namespace WebCore
diff --git a/src/javascript/jsc/bindings/webcore/JSDOMConvertWebGL.cpp b/src/javascript/jsc/bindings/webcore/JSDOMConvertWebGL.cpp
new file mode 100644
index 000000000..e2f6db743
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/JSDOMConvertWebGL.cpp
@@ -0,0 +1,247 @@
+/*
+ * Copyright (C) 2017 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "JSDOMConvertWebGL.h"
+
+#if ENABLE(WEBGL)
+
+#include "JSANGLEInstancedArrays.h"
+#include "JSDOMConvertBufferSource.h"
+#include "JSEXTBlendMinMax.h"
+#include "JSEXTColorBufferFloat.h"
+#include "JSEXTColorBufferHalfFloat.h"
+#include "JSEXTFloatBlend.h"
+#include "JSEXTFragDepth.h"
+#include "JSEXTShaderTextureLOD.h"
+#include "JSEXTTextureCompressionRGTC.h"
+#include "JSEXTTextureFilterAnisotropic.h"
+#include "JSEXTsRGB.h"
+#include "JSKHRParallelShaderCompile.h"
+#include "JSOESElementIndexUint.h"
+#include "JSOESFBORenderMipmap.h"
+#include "JSOESStandardDerivatives.h"
+#include "JSOESTextureFloat.h"
+#include "JSOESTextureFloatLinear.h"
+#include "JSOESTextureHalfFloat.h"
+#include "JSOESTextureHalfFloatLinear.h"
+#include "JSOESVertexArrayObject.h"
+#include "JSWebGLBuffer.h"
+#include "JSWebGLColorBufferFloat.h"
+#include "JSWebGLCompressedTextureASTC.h"
+#include "JSWebGLCompressedTextureATC.h"
+#include "JSWebGLCompressedTextureETC.h"
+#include "JSWebGLCompressedTextureETC1.h"
+#include "JSWebGLCompressedTexturePVRTC.h"
+#include "JSWebGLCompressedTextureS3TC.h"
+#include "JSWebGLCompressedTextureS3TCsRGB.h"
+#include "JSWebGLDebugRendererInfo.h"
+#include "JSWebGLDebugShaders.h"
+#include "JSWebGLDepthTexture.h"
+#include "JSWebGLDrawBuffers.h"
+#include "JSWebGLFramebuffer.h"
+#include "JSWebGLLoseContext.h"
+#include "JSWebGLMultiDraw.h"
+#include "JSWebGLProgram.h"
+#include "JSWebGLRenderbuffer.h"
+#include "JSWebGLSampler.h"
+#include "JSWebGLTexture.h"
+#include "JSWebGLTransformFeedback.h"
+#include "JSWebGLVertexArrayObject.h"
+#include "JSWebGLVertexArrayObjectOES.h"
+#include "JavaScriptCore/JSCInlines.h"
+
+namespace WebCore {
+using namespace JSC;
+
+// FIXME: This should use the IDLUnion JSConverter.
+JSValue convertToJSValue(JSGlobalObject& lexicalGlobalObject, JSDOMGlobalObject& globalObject, const WebGLAny& any)
+{
+    return WTF::switchOn(
+        any,
+        [](std::nullptr_t) -> JSValue {
+            return jsNull();
+        },
+        [](bool value) -> JSValue {
+            return jsBoolean(value);
+        },
+        [](int value) -> JSValue {
+            return jsNumber(value);
+        },
+        [](unsigned value) -> JSValue {
+            return jsNumber(value);
+        },
+        [](long long value) -> JSValue {
+            return jsNumber(value);
+        },
+        [](float value) -> JSValue {
+            return jsNumber(value);
+        },
+        [&](const String& value) -> JSValue {
+            return jsStringWithCache(lexicalGlobalObject.vm(), value);
+        },
+        [&](const Vector<bool>& values) -> JSValue {
+            MarkedArgumentBuffer list;
+            for (auto& value : values)
+                list.append(jsBoolean(value));
+            RELEASE_ASSERT(!list.hasOverflowed());
+            return constructArray(&globalObject, static_cast<JSC::ArrayAllocationProfile*>(nullptr), list);
+        },
+        [&](const Vector<int>& values) -> JSValue {
+            MarkedArgumentBuffer list;
+            for (auto& value : values)
+                list.append(jsNumber(value));
+            RELEASE_ASSERT(!list.hasOverflowed());
+            return constructArray(&globalObject, static_cast<JSC::ArrayAllocationProfile*>(nullptr), list);
+        },
+        [&](const Vector<unsigned>& values) -> JSValue {
+            MarkedArgumentBuffer list;
+            for (auto& value : values)
+                list.append(jsNumber(value));
+            RELEASE_ASSERT(!list.hasOverflowed());
+            return constructArray(&globalObject, static_cast<JSC::ArrayAllocationProfile*>(nullptr), list);
+        },
+        [&](const RefPtr<Float32Array>& array) {
+            return toJS(&lexicalGlobalObject, &globalObject, array.get());
+        },
+        [&](const RefPtr<Int32Array>& array) {
+            return toJS(&lexicalGlobalObject, &globalObject, array.get());
+        },
+        [&](const RefPtr<Uint8Array>& array) {
+            return toJS(&lexicalGlobalObject, &globalObject, array.get());
+        },
+        [&](const RefPtr<Uint32Array>& array) {
+            return toJS(&lexicalGlobalObject, &globalObject, array.get());
+        },
+        [&](const RefPtr<WebGLBuffer>& buffer) {
+            return toJS(&lexicalGlobalObject, &globalObject, buffer.get());
+        },
+        [&](const RefPtr<WebGLFramebuffer>& buffer) {
+            return toJS(&lexicalGlobalObject, &globalObject, buffer.get());
+        },
+        [&](const RefPtr<WebGLProgram>& program) {
+            return toJS(&lexicalGlobalObject, &globalObject, program.get());
+        },
+        [&](const RefPtr<WebGLRenderbuffer>& buffer) {
+            return toJS(&lexicalGlobalObject, &globalObject, buffer.get());
+        },
+        [&](const RefPtr<WebGLTexture>& texture) {
+            return toJS(&lexicalGlobalObject, &globalObject, texture.get());
+        },
+        [&](const RefPtr<WebGLVertexArrayObjectOES>& array) {
+            return toJS(&lexicalGlobalObject, &globalObject, array.get());
+        }
+#if ENABLE(WEBGL2)
+        ,
+        [&](const RefPtr<WebGLSampler>& sampler) {
+            return toJS(&lexicalGlobalObject, &globalObject, sampler.get());
+        },
+        [&](const RefPtr<WebGLTransformFeedback>& transformFeedback) {
+            return toJS(&lexicalGlobalObject, &globalObject, transformFeedback.get());
+        },
+        [&](const RefPtr<WebGLVertexArrayObject>& array) {
+            return toJS(&lexicalGlobalObject, &globalObject, array.get());
+        }
+#endif
+    );
+}
+
+JSValue convertToJSValue(JSGlobalObject& lexicalGlobalObject, JSDOMGlobalObject& globalObject, WebGLExtension& extension)
+{
+    switch (extension.getName()) {
+    case WebGLExtension::WebGLLoseContextName:
+        return toJS(&lexicalGlobalObject, &globalObject, static_cast<WebGLLoseContext&>(extension));
+    case WebGLExtension::EXTShaderTextureLODName:
+        return toJS(&lexicalGlobalObject, &globalObject, static_cast<EXTShaderTextureLOD&>(extension));
+    case WebGLExtension::EXTTextureCompressionRGTCName:
+        return toJS(&lexicalGlobalObject, &globalObject, static_cast<EXTTextureCompressionRGTC&>(extension));
+    case WebGLExtension::EXTTextureFilterAnisotropicName:
+        return toJS(&lexicalGlobalObject, &globalObject, static_cast<EXTTextureFilterAnisotropic&>(extension));
+    case WebGLExtension::EXTsRGBName:
+        return toJS(&lexicalGlobalObject, &globalObject, static_cast<EXTsRGB&>(extension));
+    case WebGLExtension::EXTFragDepthName:
+        return toJS(&lexicalGlobalObject, &globalObject, static_cast<EXTFragDepth&>(extension));
+    case WebGLExtension::EXTBlendMinMaxName:
+        return toJS(&lexicalGlobalObject, &globalObject, static_cast<EXTBlendMinMax&>(extension));
+    case WebGLExtension::KHRParallelShaderCompileName:
+        return toJS(&lexicalGlobalObject, &globalObject, static_cast<KHRParallelShaderCompile&>(extension));
+    case WebGLExtension::OESStandardDerivativesName:
+        return toJS(&lexicalGlobalObject, &globalObject, static_cast<OESStandardDerivatives&>(extension));
+    case WebGLExtension::OESTextureFloatName:
+        return toJS(&lexicalGlobalObject, &globalObject, static_cast<OESTextureFloat&>(extension));
+    case WebGLExtension::OESTextureFloatLinearName:
+        return toJS(&lexicalGlobalObject, &globalObject, static_cast<OESTextureFloatLinear&>(extension));
+    case WebGLExtension::OESTextureHalfFloatName:
+        return toJS(&lexicalGlobalObject, &globalObject, static_cast<OESTextureHalfFloat&>(extension));
+    case WebGLExtension::OESTextureHalfFloatLinearName:
+        return toJS(&lexicalGlobalObject, &globalObject, static_cast<OESTextureHalfFloatLinear&>(extension));
+    case WebGLExtension::OESVertexArrayObjectName:
+        return toJS(&lexicalGlobalObject, &globalObject, static_cast<OESVertexArrayObject&>(extension));
+    case WebGLExtension::OESElementIndexUintName:
+        return toJS(&lexicalGlobalObject, &globalObject, static_cast<OESElementIndexUint&>(extension));
+    case WebGLExtension::OESFBORenderMipmapName:
+        return toJS(&lexicalGlobalObject, &globalObject, static_cast<OESFBORenderMipmap&>(extension));
+    case WebGLExtension::WebGLDebugRendererInfoName:
+        return toJS(&lexicalGlobalObject, &globalObject, static_cast<WebGLDebugRendererInfo&>(extension));
+    case WebGLExtension::WebGLDebugShadersName:
+        return toJS(&lexicalGlobalObject, &globalObject, static_cast<WebGLDebugShaders&>(extension));
+    case WebGLExtension::WebGLCompressedTextureATCName:
+        return toJS(&lexicalGlobalObject, &globalObject, static_cast<WebGLCompressedTextureATC&>(extension));
+    case WebGLExtension::WebGLCompressedTextureETCName:
+        return toJS(&lexicalGlobalObject, &globalObject, static_cast<WebGLCompressedTextureETC&>(extension));
+    case WebGLExtension::WebGLCompressedTextureETC1Name:
+        return toJS(&lexicalGlobalObject, &globalObject, static_cast<WebGLCompressedTextureETC1&>(extension));
+    case WebGLExtension::WebGLCompressedTexturePVRTCName:
+        return toJS(&lexicalGlobalObject, &globalObject, static_cast<WebGLCompressedTexturePVRTC&>(extension));
+    case WebGLExtension::WebGLCompressedTextureS3TCName:
+        return toJS(&lexicalGlobalObject, &globalObject, static_cast<WebGLCompressedTextureS3TC&>(extension));
+    case WebGLExtension::WebGLCompressedTextureS3TCsRGBName:
+        return toJS(&lexicalGlobalObject, &globalObject, static_cast<WebGLCompressedTextureS3TCsRGB&>(extension));
+    case WebGLExtension::WebGLCompressedTextureASTCName:
+        return toJS(&lexicalGlobalObject, &globalObject, static_cast<WebGLCompressedTextureASTC&>(extension));
+    case WebGLExtension::WebGLDepthTextureName:
+        return toJS(&lexicalGlobalObject, &globalObject, static_cast<WebGLDepthTexture&>(extension));
+    case WebGLExtension::WebGLDrawBuffersName:
+        return toJS(&lexicalGlobalObject, &globalObject, static_cast<WebGLDrawBuffers&>(extension));
+    case WebGLExtension::ANGLEInstancedArraysName:
+        return toJS(&lexicalGlobalObject, &globalObject, static_cast<ANGLEInstancedArrays&>(extension));
+    case WebGLExtension::EXTColorBufferHalfFloatName:
+        return toJS(&lexicalGlobalObject, &globalObject, static_cast<EXTColorBufferHalfFloat&>(extension));
+    case WebGLExtension::EXTFloatBlendName:
+        return toJS(&lexicalGlobalObject, &globalObject, static_cast<EXTFloatBlend&>(extension));
+    case WebGLExtension::WebGLColorBufferFloatName:
+        return toJS(&lexicalGlobalObject, &globalObject, static_cast<WebGLColorBufferFloat&>(extension));
+    case WebGLExtension::EXTColorBufferFloatName:
+        return toJS(&lexicalGlobalObject, &globalObject, static_cast<EXTColorBufferFloat&>(extension));
+    case WebGLExtension::WebGLMultiDrawName:
+        return toJS(&lexicalGlobalObject, &globalObject, static_cast<WebGLMultiDraw&>(extension));
+    }
+    ASSERT_NOT_REACHED();
+    return jsNull();
+}
+
+}
+
+#endif
diff --git a/src/javascript/jsc/bindings/webcore/JSDOMConvertWebGL.h b/src/javascript/jsc/bindings/webcore/JSDOMConvertWebGL.h
new file mode 100644
index 000000000..ae8f7e688
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/JSDOMConvertWebGL.h
@@ -0,0 +1,68 @@
+/*
+ * Copyright (C) 2016 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#if ENABLE(WEBGL)
+
+#include "IDLTypes.h"
+#include "JSDOMConvertBase.h"
+
+namespace WebCore {
+
+JSC::JSValue convertToJSValue(JSC::JSGlobalObject&, JSDOMGlobalObject&, const WebGLAny&);
+JSC::JSValue convertToJSValue(JSC::JSGlobalObject&, JSDOMGlobalObject&, WebGLExtension&);
+
+inline JSC::JSValue convertToJSValue(JSC::JSGlobalObject& lexicalGlobalObject, JSDOMGlobalObject& globalObject, WebGLExtension* extension)
+{
+    if (!extension)
+        return JSC::jsNull();
+    return convertToJSValue(lexicalGlobalObject, globalObject, *extension);
+}
+
+template<> struct JSConverter<IDLWebGLAny> {
+    static constexpr bool needsState = true;
+    static constexpr bool needsGlobalObject = true;
+
+    static JSC::JSValue convert(JSC::JSGlobalObject& lexicalGlobalObject, JSDOMGlobalObject& globalObject, const WebGLAny& value)
+    {
+        return convertToJSValue(lexicalGlobalObject, globalObject, value);
+    }
+};
+
+template<> struct JSConverter<IDLWebGLExtension> {
+    static constexpr bool needsState = true;
+    static constexpr bool needsGlobalObject = true;
+
+    template <typename T>
+    static JSC::JSValue convert(JSC::JSGlobalObject& lexicalGlobalObject, JSDOMGlobalObject& globalObject, const T& value)
+    {
+        return convertToJSValue(lexicalGlobalObject, globalObject, Detail::getPtrOrRef(value));
+    }
+};
+
+} // namespace WebCore
+
+#endif
diff --git a/src/javascript/jsc/bindings/webcore/JSDOMConvertXPathNSResolver.h b/src/javascript/jsc/bindings/webcore/JSDOMConvertXPathNSResolver.h
new file mode 100644
index 000000000..eed7d1980
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/JSDOMConvertXPathNSResolver.h
@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2016 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "IDLTypes.h"
+#include "JSDOMConvertBase.h"
+
+#include "JSCustomXPathNSResolver.h"
+#include "JSXPathNSResolver.h"
+
+namespace WebCore {
+
+template<> struct Converter<IDLInterface<XPathNSResolver>> : DefaultConverter<IDLInterface<XPathNSResolver>> {
+    template<typename ExceptionThrower = DefaultExceptionThrower>
+    static RefPtr<XPathNSResolver> convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value, ExceptionThrower&& exceptionThrower = ExceptionThrower())
+    {
+        JSC::VM& vm = JSC::getVM(&lexicalGlobalObject);
+        auto scope = DECLARE_THROW_SCOPE(vm);
+        if (!value.isObject()) {
+            exceptionThrower(lexicalGlobalObject, scope);
+            return nullptr;
+        }
+
+        auto object = asObject(value);
+        if (object->inherits<JSXPathNSResolver>(vm))
+            return &JSC::jsCast<JSXPathNSResolver*>(object)->wrapped();
+
+        return JSCustomXPathNSResolver::create(vm, object);
+    }
+};
+
+} // namespace WebCore
diff --git a/src/javascript/jsc/bindings/webcore/JSDOMException.cpp b/src/javascript/jsc/bindings/webcore/JSDOMException.cpp
new file mode 100644
index 000000000..4a075205f
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/JSDOMException.cpp
@@ -0,0 +1,381 @@
+/*
+    This file is part of the WebKit open source project.
+    This file has been generated by generate-bindings.pl. DO NOT MODIFY!
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Library General Public
+    License as published by the Free Software Foundation; either
+    version 2 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Library General Public License for more details.
+
+    You should have received a copy of the GNU Library General Public License
+    along with this library; see the file COPYING.LIB.  If not, write to
+    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+    Boston, MA 02110-1301, USA.
+*/
+
+#include "root.h"
+
+#include "JSDOMException.h"
+
+#include "ActiveDOMObject.h"
+#include "ExtendedDOMClientIsoSubspaces.h"
+#include "ExtendedDOMIsoSubspaces.h"
+#include "JSDOMAttribute.h"
+#include "JSDOMBinding.h"
+#include "JSDOMConstructor.h"
+#include "JSDOMConvertInterface.h"
+#include "JSDOMConvertNumbers.h"
+#include "JSDOMConvertStrings.h"
+#include "JSDOMExceptionHandling.h"
+#include "JSDOMGlobalObjectInlines.h"
+#include "JSDOMWrapperCache.h"
+#include "ScriptExecutionContext.h"
+#include "WebCoreJSClientData.h"
+#include "JavaScriptCore/FunctionPrototype.h"
+#include "JavaScriptCore/HeapAnalyzer.h"
+#include "JavaScriptCore/JSCInlines.h"
+#include "JavaScriptCore/JSDestructibleObjectHeapCellType.h"
+#include "JavaScriptCore/SlotVisitorMacros.h"
+#include "JavaScriptCore/SubspaceInlines.h"
+#include "wtf/GetPtr.h"
+#include "wtf/PointerPreparations.h"
+#include "wtf/URL.h"
+
+namespace WebCore {
+using namespace JSC;
+
+// Attributes
+
+static JSC_DECLARE_CUSTOM_GETTER(jsDOMExceptionConstructor);
+static JSC_DECLARE_CUSTOM_GETTER(jsDOMException_code);
+static JSC_DECLARE_CUSTOM_GETTER(jsDOMException_name);
+static JSC_DECLARE_CUSTOM_GETTER(jsDOMException_message);
+
+class JSDOMExceptionPrototype final : public JSC::JSNonFinalObject {
+public:
+    using Base = JSC::JSNonFinalObject;
+    static JSDOMExceptionPrototype* create(JSC::VM& vm, JSDOMGlobalObject* globalObject, JSC::Structure* structure)
+    {
+        JSDOMExceptionPrototype* ptr = new (NotNull, JSC::allocateCell<JSDOMExceptionPrototype>(vm)) JSDOMExceptionPrototype(vm, globalObject, structure);
+        ptr->finishCreation(vm);
+        return ptr;
+    }
+
+    DECLARE_INFO;
+    template<typename CellType, JSC::SubspaceAccess>
+    static JSC::GCClient::IsoSubspace* subspaceFor(JSC::VM& vm)
+    {
+        STATIC_ASSERT_ISO_SUBSPACE_SHARABLE(JSDOMExceptionPrototype, Base);
+        return &vm.plainObjectSpace();
+    }
+    static JSC::Structure* createStructure(JSC::VM& vm, JSC::JSGlobalObject* globalObject, JSC::JSValue prototype)
+    {
+        return JSC::Structure::create(vm, globalObject, prototype, JSC::TypeInfo(JSC::ObjectType, StructureFlags), info());
+    }
+
+private:
+    JSDOMExceptionPrototype(JSC::VM& vm, JSC::JSGlobalObject*, JSC::Structure* structure)
+        : JSC::JSNonFinalObject(vm, structure)
+    {
+    }
+
+    void finishCreation(JSC::VM&);
+};
+STATIC_ASSERT_ISO_SUBSPACE_SHARABLE(JSDOMExceptionPrototype, JSDOMExceptionPrototype::Base);
+
+using JSDOMExceptionDOMConstructor = JSDOMConstructor<JSDOMException>;
+
+/* Hash table for constructor */
+
+static const HashTableValue JSDOMExceptionConstructorTableValues[] = {
+    { "INDEX_SIZE_ERR", JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::ConstantInteger, NoIntrinsic, { (long long)(1) } },
+    { "DOMSTRING_SIZE_ERR", JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::ConstantInteger, NoIntrinsic, { (long long)(2) } },
+    { "HIERARCHY_REQUEST_ERR", JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::ConstantInteger, NoIntrinsic, { (long long)(3) } },
+    { "WRONG_DOCUMENT_ERR", JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::ConstantInteger, NoIntrinsic, { (long long)(4) } },
+    { "INVALID_CHARACTER_ERR", JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::ConstantInteger, NoIntrinsic, { (long long)(5) } },
+    { "NO_DATA_ALLOWED_ERR", JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::ConstantInteger, NoIntrinsic, { (long long)(6) } },
+    { "NO_MODIFICATION_ALLOWED_ERR", JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::ConstantInteger, NoIntrinsic, { (long long)(7) } },
+    { "NOT_FOUND_ERR", JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::ConstantInteger, NoIntrinsic, { (long long)(8) } },
+    { "NOT_SUPPORTED_ERR", JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::ConstantInteger, NoIntrinsic, { (long long)(9) } },
+    { "INUSE_ATTRIBUTE_ERR", JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::ConstantInteger, NoIntrinsic, { (long long)(10) } },
+    { "INVALID_STATE_ERR", JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::ConstantInteger, NoIntrinsic, { (long long)(11) } },
+    { "SYNTAX_ERR", JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::ConstantInteger, NoIntrinsic, { (long long)(12) } },
+    { "INVALID_MODIFICATION_ERR", JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::ConstantInteger, NoIntrinsic, { (long long)(13) } },
+    { "NAMESPACE_ERR", JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::ConstantInteger, NoIntrinsic, { (long long)(14) } },
+    { "INVALID_ACCESS_ERR", JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::ConstantInteger, NoIntrinsic, { (long long)(15) } },
+    { "VALIDATION_ERR", JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::ConstantInteger, NoIntrinsic, { (long long)(16) } },
+    { "TYPE_MISMATCH_ERR", JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::ConstantInteger, NoIntrinsic, { (long long)(17) } },
+    { "SECURITY_ERR", JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::ConstantInteger, NoIntrinsic, { (long long)(18) } },
+    { "NETWORK_ERR", JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::ConstantInteger, NoIntrinsic, { (long long)(19) } },
+    { "ABORT_ERR", JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::ConstantInteger, NoIntrinsic, { (long long)(20) } },
+    { "URL_MISMATCH_ERR", JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::ConstantInteger, NoIntrinsic, { (long long)(21) } },
+    { "QUOTA_EXCEEDED_ERR", JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::ConstantInteger, NoIntrinsic, { (long long)(22) } },
+    { "TIMEOUT_ERR", JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::ConstantInteger, NoIntrinsic, { (long long)(23) } },
+    { "INVALID_NODE_TYPE_ERR", JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::ConstantInteger, NoIntrinsic, { (long long)(24) } },
+    { "DATA_CLONE_ERR", JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::ConstantInteger, NoIntrinsic, { (long long)(25) } },
+};
+
+template<> EncodedJSValue JSC_HOST_CALL_ATTRIBUTES JSDOMExceptionDOMConstructor::construct(JSGlobalObject* lexicalGlobalObject, CallFrame* callFrame)
+{
+    VM& vm = lexicalGlobalObject->vm();
+    auto throwScope = DECLARE_THROW_SCOPE(vm);
+    auto* castedThis = jsCast<JSDOMExceptionDOMConstructor*>(callFrame->jsCallee());
+    ASSERT(castedThis);
+    EnsureStillAliveScope argument0 = callFrame->argument(0);
+    auto message = argument0.value().isUndefined() ? emptyString() : convert<IDLDOMString>(*lexicalGlobalObject, argument0.value());
+    RETURN_IF_EXCEPTION(throwScope, encodedJSValue());
+    EnsureStillAliveScope argument1 = callFrame->argument(1);
+    auto name = argument1.value().isUndefined() ? "Error"_s : convert<IDLDOMString>(*lexicalGlobalObject, argument1.value());
+    RETURN_IF_EXCEPTION(throwScope, encodedJSValue());
+    auto object = DOMException::create(WTFMove(message), WTFMove(name));
+    if constexpr (IsExceptionOr<decltype(object)>)
+        RETURN_IF_EXCEPTION(throwScope, {});
+    static_assert(TypeOrExceptionOrUnderlyingType<decltype(object)>::isRef);
+    auto jsValue = toJSNewlyCreated<IDLInterface<DOMException>>(*lexicalGlobalObject, *castedThis->globalObject(), throwScope, WTFMove(object));
+    if constexpr (IsExceptionOr<decltype(object)>)
+        RETURN_IF_EXCEPTION(throwScope, {});
+    setSubclassStructureIfNeeded<DOMException>(lexicalGlobalObject, callFrame, asObject(jsValue));
+    RETURN_IF_EXCEPTION(throwScope, {});
+    return JSValue::encode(jsValue);
+}
+JSC_ANNOTATE_HOST_FUNCTION(JSDOMExceptionDOMConstructorConstruct, JSDOMExceptionDOMConstructor::construct);
+
+template<> const ClassInfo JSDOMExceptionDOMConstructor::s_info = { "DOMException"_s, &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(JSDOMExceptionDOMConstructor) };
+
+template<> JSValue JSDOMExceptionDOMConstructor::prototypeForStructure(JSC::VM& vm, const JSDOMGlobalObject& globalObject)
+{
+    UNUSED_PARAM(vm);
+    return globalObject.functionPrototype();
+}
+
+template<> void JSDOMExceptionDOMConstructor::initializeProperties(VM& vm, JSDOMGlobalObject& globalObject)
+{
+    putDirect(vm, vm.propertyNames->length, jsNumber(0), JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::DontEnum);
+    JSString* nameString = jsNontrivialString(vm, "DOMException"_s);
+    m_originalName.set(vm, this, nameString);
+    putDirect(vm, vm.propertyNames->name, nameString, JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::DontEnum);
+    putDirect(vm, vm.propertyNames->prototype, JSDOMException::prototype(vm, globalObject), JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::DontDelete);
+    reifyStaticProperties(vm, JSDOMException::info(), JSDOMExceptionConstructorTableValues, *this);
+}
+
+/* Hash table for prototype */
+
+static const HashTableValue JSDOMExceptionPrototypeTableValues[] = {
+    { "constructor", static_cast<unsigned>(JSC::PropertyAttribute::DontEnum), NoIntrinsic, { (intptr_t) static_cast<PropertySlot::GetValueFunc>(jsDOMExceptionConstructor), (intptr_t) static_cast<PutPropertySlot::PutValueFunc>(0) } },
+    { "code", static_cast<unsigned>(JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::CustomAccessor | JSC::PropertyAttribute::DOMAttribute), NoIntrinsic, { (intptr_t) static_cast<PropertySlot::GetValueFunc>(jsDOMException_code), (intptr_t) static_cast<PutPropertySlot::PutValueFunc>(0) } },
+    { "name", static_cast<unsigned>(JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::CustomAccessor | JSC::PropertyAttribute::DOMAttribute), NoIntrinsic, { (intptr_t) static_cast<PropertySlot::GetValueFunc>(jsDOMException_name), (intptr_t) static_cast<PutPropertySlot::PutValueFunc>(0) } },
+    { "message", static_cast<unsigned>(JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::CustomAccessor | JSC::PropertyAttribute::DOMAttribute), NoIntrinsic, { (intptr_t) static_cast<PropertySlot::GetValueFunc>(jsDOMException_message), (intptr_t) static_cast<PutPropertySlot::PutValueFunc>(0) } },
+    { "INDEX_SIZE_ERR", JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::ConstantInteger, NoIntrinsic, { (long long)(1) } },
+    { "DOMSTRING_SIZE_ERR", JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::ConstantInteger, NoIntrinsic, { (long long)(2) } },
+    { "HIERARCHY_REQUEST_ERR", JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::ConstantInteger, NoIntrinsic, { (long long)(3) } },
+    { "WRONG_DOCUMENT_ERR", JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::ConstantInteger, NoIntrinsic, { (long long)(4) } },
+    { "INVALID_CHARACTER_ERR", JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::ConstantInteger, NoIntrinsic, { (long long)(5) } },
+    { "NO_DATA_ALLOWED_ERR", JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::ConstantInteger, NoIntrinsic, { (long long)(6) } },
+    { "NO_MODIFICATION_ALLOWED_ERR", JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::ConstantInteger, NoIntrinsic, { (long long)(7) } },
+    { "NOT_FOUND_ERR", JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::ConstantInteger, NoIntrinsic, { (long long)(8) } },
+    { "NOT_SUPPORTED_ERR", JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::ConstantInteger, NoIntrinsic, { (long long)(9) } },
+    { "INUSE_ATTRIBUTE_ERR", JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::ConstantInteger, NoIntrinsic, { (long long)(10) } },
+    { "INVALID_STATE_ERR", JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::ConstantInteger, NoIntrinsic, { (long long)(11) } },
+    { "SYNTAX_ERR", JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::ConstantInteger, NoIntrinsic, { (long long)(12) } },
+    { "INVALID_MODIFICATION_ERR", JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::ConstantInteger, NoIntrinsic, { (long long)(13) } },
+    { "NAMESPACE_ERR", JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::ConstantInteger, NoIntrinsic, { (long long)(14) } },
+    { "INVALID_ACCESS_ERR", JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::ConstantInteger, NoIntrinsic, { (long long)(15) } },
+    { "VALIDATION_ERR", JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::ConstantInteger, NoIntrinsic, { (long long)(16) } },
+    { "TYPE_MISMATCH_ERR", JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::ConstantInteger, NoIntrinsic, { (long long)(17) } },
+    { "SECURITY_ERR", JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::ConstantInteger, NoIntrinsic, { (long long)(18) } },
+    { "NETWORK_ERR", JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::ConstantInteger, NoIntrinsic, { (long long)(19) } },
+    { "ABORT_ERR", JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::ConstantInteger, NoIntrinsic, { (long long)(20) } },
+    { "URL_MISMATCH_ERR", JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::ConstantInteger, NoIntrinsic, { (long long)(21) } },
+    { "QUOTA_EXCEEDED_ERR", JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::ConstantInteger, NoIntrinsic, { (long long)(22) } },
+    { "TIMEOUT_ERR", JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::ConstantInteger, NoIntrinsic, { (long long)(23) } },
+    { "INVALID_NODE_TYPE_ERR", JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::ConstantInteger, NoIntrinsic, { (long long)(24) } },
+    { "DATA_CLONE_ERR", JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::ConstantInteger, NoIntrinsic, { (long long)(25) } },
+};
+
+const ClassInfo JSDOMExceptionPrototype::s_info = { "DOMException"_s, &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(JSDOMExceptionPrototype) };
+
+void JSDOMExceptionPrototype::finishCreation(VM& vm)
+{
+    Base::finishCreation(vm);
+    reifyStaticProperties(vm, JSDOMException::info(), JSDOMExceptionPrototypeTableValues, *this);
+    JSC_TO_STRING_TAG_WITHOUT_TRANSITION();
+}
+
+const ClassInfo JSDOMException::s_info = { "DOMException"_s, &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(JSDOMException) };
+
+JSDOMException::JSDOMException(Structure* structure, JSDOMGlobalObject& globalObject, Ref<DOMException>&& impl)
+    : JSDOMWrapper<DOMException>(structure, globalObject, WTFMove(impl))
+{
+}
+
+void JSDOMException::finishCreation(VM& vm)
+{
+    Base::finishCreation(vm);
+    ASSERT(inherits(vm, info()));
+
+    // static_assert(!std::is_base_of<ActiveDOMObject, DOMException>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+}
+
+JSObject* JSDOMException::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
+{
+    return JSDOMExceptionPrototype::create(vm, &globalObject, JSDOMExceptionPrototype::createStructure(vm, &globalObject, globalObject.errorPrototype()));
+}
+
+JSObject* JSDOMException::prototype(VM& vm, JSDOMGlobalObject& globalObject)
+{
+    return getDOMPrototype<JSDOMException>(vm, globalObject);
+}
+
+JSValue JSDOMException::getConstructor(VM& vm, const JSGlobalObject* globalObject)
+{
+    return getDOMConstructor<JSDOMExceptionDOMConstructor, DOMConstructorID::DOMException>(vm, *jsCast<const JSDOMGlobalObject*>(globalObject));
+}
+
+void JSDOMException::destroy(JSC::JSCell* cell)
+{
+    JSDOMException* thisObject = static_cast<JSDOMException*>(cell);
+    thisObject->JSDOMException::~JSDOMException();
+}
+
+JSC_DEFINE_CUSTOM_GETTER(jsDOMExceptionConstructor, (JSGlobalObject * lexicalGlobalObject, EncodedJSValue thisValue, PropertyName))
+{
+    VM& vm = JSC::getVM(lexicalGlobalObject);
+    auto throwScope = DECLARE_THROW_SCOPE(vm);
+    auto* prototype = jsDynamicCast<JSDOMExceptionPrototype*>(vm, JSValue::decode(thisValue));
+    if (UNLIKELY(!prototype))
+        return throwVMTypeError(lexicalGlobalObject, throwScope);
+    return JSValue::encode(JSDOMException::getConstructor(JSC::getVM(lexicalGlobalObject), prototype->globalObject()));
+}
+
+static inline JSValue jsDOMException_codeGetter(JSGlobalObject& lexicalGlobalObject, JSDOMException& thisObject)
+{
+    auto& vm = JSC::getVM(&lexicalGlobalObject);
+    auto throwScope = DECLARE_THROW_SCOPE(vm);
+    auto& impl = thisObject.wrapped();
+    RELEASE_AND_RETURN(throwScope, (toJS<IDLUnsignedShort>(lexicalGlobalObject, throwScope, impl.legacyCode())));
+}
+
+JSC_DEFINE_CUSTOM_GETTER(jsDOMException_code, (JSGlobalObject * lexicalGlobalObject, EncodedJSValue thisValue, PropertyName attributeName))
+{
+    return IDLAttribute<JSDOMException>::get<jsDOMException_codeGetter, CastedThisErrorBehavior::Assert>(*lexicalGlobalObject, thisValue, attributeName);
+}
+
+static inline JSValue jsDOMException_nameGetter(JSGlobalObject& lexicalGlobalObject, JSDOMException& thisObject)
+{
+    auto& vm = JSC::getVM(&lexicalGlobalObject);
+    auto throwScope = DECLARE_THROW_SCOPE(vm);
+    auto& impl = thisObject.wrapped();
+    RELEASE_AND_RETURN(throwScope, (toJS<IDLDOMString>(lexicalGlobalObject, throwScope, impl.name())));
+}
+
+JSC_DEFINE_CUSTOM_GETTER(jsDOMException_name, (JSGlobalObject * lexicalGlobalObject, EncodedJSValue thisValue, PropertyName attributeName))
+{
+    return IDLAttribute<JSDOMException>::get<jsDOMException_nameGetter, CastedThisErrorBehavior::Assert>(*lexicalGlobalObject, thisValue, attributeName);
+}
+
+static inline JSValue jsDOMException_messageGetter(JSGlobalObject& lexicalGlobalObject, JSDOMException& thisObject)
+{
+    auto& vm = JSC::getVM(&lexicalGlobalObject);
+    auto throwScope = DECLARE_THROW_SCOPE(vm);
+    auto& impl = thisObject.wrapped();
+    RELEASE_AND_RETURN(throwScope, (toJS<IDLDOMString>(lexicalGlobalObject, throwScope, impl.message())));
+}
+
+JSC_DEFINE_CUSTOM_GETTER(jsDOMException_message, (JSGlobalObject * lexicalGlobalObject, EncodedJSValue thisValue, PropertyName attributeName))
+{
+    return IDLAttribute<JSDOMException>::get<jsDOMException_messageGetter, CastedThisErrorBehavior::Assert>(*lexicalGlobalObject, thisValue, attributeName);
+}
+
+JSC::GCClient::IsoSubspace* JSDOMException::subspaceForImpl(JSC::VM& vm)
+{
+    return WebCore::subspaceForImpl<JSDOMException, UseCustomHeapCellType::No>(
+        vm,
+        [](auto& spaces) { return spaces.m_clientSubspaceForDOMException.get(); },
+        [](auto& spaces, auto&& space) { spaces.m_clientSubspaceForDOMException = WTFMove(space); },
+        [](auto& spaces) { return spaces.m_subspaceForDOMException.get(); },
+        [](auto& spaces, auto&& space) { spaces.m_subspaceForDOMException = WTFMove(space); });
+}
+
+void JSDOMException::analyzeHeap(JSCell* cell, HeapAnalyzer& analyzer)
+{
+    auto* thisObject = jsCast<JSDOMException*>(cell);
+    analyzer.setWrappedObjectForCell(cell, &thisObject->wrapped());
+    // if (thisObject->scriptExecutionContext())
+    //     analyzer.setLabelForCell(cell, "url " + thisObject->scriptExecutionContext()->url().string());
+    Base::analyzeHeap(cell, analyzer);
+}
+
+bool JSDOMExceptionOwner::isReachableFromOpaqueRoots(JSC::Handle<JSC::Unknown> handle, void*, AbstractSlotVisitor& visitor, const char** reason)
+{
+    UNUSED_PARAM(handle);
+    UNUSED_PARAM(visitor);
+    UNUSED_PARAM(reason);
+    return false;
+}
+
+void JSDOMExceptionOwner::finalize(JSC::Handle<JSC::Unknown> handle, void* context)
+{
+    auto* jsDOMException = static_cast<JSDOMException*>(handle.slot()->asCell());
+    auto& world = *static_cast<DOMWrapperWorld*>(context);
+    uncacheWrapper(world, &jsDOMException->wrapped(), jsDOMException);
+}
+
+// #if ENABLE(BINDING_INTEGRITY)
+// #if PLATFORM(WIN)
+// #pragma warning(disable : 4483)
+// extern "C" {
+// extern void (*const __identifier("??_7DOMException@WebCore@@6B@")[])();
+// }
+// #else
+// extern "C" {
+// extern void* _ZTVN7WebCore12DOMExceptionE[];
+// }
+// #endif
+// #endif
+
+JSC::JSValue toJSNewlyCreated(JSC::JSGlobalObject*, JSDOMGlobalObject* globalObject, Ref<DOMException>&& impl)
+{
+
+    // if constexpr (std::is_polymorphic_v<DOMException>) {
+    // #if ENABLE(BINDING_INTEGRITY)
+    //         const void* actualVTablePointer = getVTablePointer(impl.ptr());
+    // #if PLATFORM(WIN)
+    //         void* expectedVTablePointer = __identifier("??_7DOMException@WebCore@@6B@");
+    // #else
+    //         void* expectedVTablePointer = &_ZTVN7WebCore12DOMExceptionE[2];
+    // #endif
+
+    //         // If you hit this assertion you either have a use after free bug, or
+    //         // DOMException has subclasses. If DOMException has subclasses that get passed
+    //         // to toJS() we currently require DOMException you to opt out of binding hardening
+    //         // by adding the SkipVTableValidation attribute to the interface IDL definition
+    //         RELEASE_ASSERT(actualVTablePointer == expectedVTablePointer);
+    // #endif
+    // }
+    return createWrapper<DOMException>(globalObject, WTFMove(impl));
+}
+
+JSC::JSValue toJS(JSC::JSGlobalObject* lexicalGlobalObject, JSDOMGlobalObject* globalObject, DOMException& impl)
+{
+    return wrap(lexicalGlobalObject, globalObject, impl);
+}
+
+DOMException* JSDOMException::toWrapped(JSC::VM& vm, JSC::JSValue value)
+{
+    if (auto* wrapper = jsDynamicCast<JSDOMException*>(vm, value))
+        return &wrapper->wrapped();
+    return nullptr;
+}
+
+inline JSC::WeakHandleOwner* wrapperOwner(DOMWrapperWorld&, DOMException*)
+{
+    static NeverDestroyed<JSDOMExceptionOwner> owner;
+    return &owner.get();
+}
+
+}
diff --git a/src/javascript/jsc/bindings/webcore/JSDOMException.h b/src/javascript/jsc/bindings/webcore/JSDOMException.h
new file mode 100644
index 000000000..0d09fdd23
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/JSDOMException.h
@@ -0,0 +1,95 @@
+/*
+    This file is part of the WebKit open source project.
+    This file has been generated by generate-bindings.pl. DO NOT MODIFY!
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Library General Public
+    License as published by the Free Software Foundation; either
+    version 2 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Library General Public License for more details.
+
+    You should have received a copy of the GNU Library General Public License
+    along with this library; see the file COPYING.LIB.  If not, write to
+    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+    Boston, MA 02110-1301, USA.
+*/
+
+#pragma once
+
+#include "root.h"
+
+#include "DOMException.h"
+#include "JSDOMWrapper.h"
+#include "JavaScriptCore/ErrorPrototype.h"
+#include "wtf/NeverDestroyed.h"
+
+#include "JavaScriptCore/WeakHandleOwner.h"
+
+namespace WebCore {
+
+class JSDOMException : public JSDOMWrapper<DOMException> {
+public:
+    using Base = JSDOMWrapper<DOMException>;
+    static JSDOMException* create(JSC::Structure* structure, JSDOMGlobalObject* globalObject, Ref<DOMException>&& impl)
+    {
+        JSDOMException* ptr = new (NotNull, JSC::allocateCell<JSDOMException>(globalObject->vm())) JSDOMException(structure, *globalObject, WTFMove(impl));
+        ptr->finishCreation(globalObject->vm());
+        return ptr;
+    }
+
+    static JSC::JSObject* createPrototype(JSC::VM&, JSDOMGlobalObject&);
+    static JSC::JSObject* prototype(JSC::VM&, JSDOMGlobalObject&);
+    static DOMException* toWrapped(JSC::VM&, JSC::JSValue);
+    static void destroy(JSC::JSCell*);
+
+    DECLARE_INFO;
+
+    static JSC::Structure* createStructure(JSC::VM& vm, JSC::JSGlobalObject* globalObject, JSC::JSValue prototype)
+    {
+        return JSC::Structure::create(vm, globalObject, prototype, JSC::TypeInfo(JSC::ObjectType, StructureFlags), info(), JSC::NonArray);
+    }
+
+    static JSC::JSValue getConstructor(JSC::VM&, const JSC::JSGlobalObject*);
+    template<typename, JSC::SubspaceAccess mode> static JSC::GCClient::IsoSubspace* subspaceFor(JSC::VM& vm)
+    {
+        if constexpr (mode == JSC::SubspaceAccess::Concurrently)
+            return nullptr;
+        return subspaceForImpl(vm);
+    }
+    static JSC::GCClient::IsoSubspace* subspaceForImpl(JSC::VM& vm);
+    static void analyzeHeap(JSCell*, JSC::HeapAnalyzer&);
+
+protected:
+    JSDOMException(JSC::Structure*, JSDOMGlobalObject&, Ref<DOMException>&&);
+
+    void finishCreation(JSC::VM&);
+};
+
+class JSDOMExceptionOwner final : public JSC::WeakHandleOwner {
+public:
+    bool isReachableFromOpaqueRoots(JSC::Handle<JSC::Unknown>, void* context, JSC::AbstractSlotVisitor&, const char**) final;
+    void finalize(JSC::Handle<JSC::Unknown>, void* context) final;
+};
+
+inline JSC::WeakHandleOwner* wrapperOwner(DOMWrapperWorld&, DOMException*);
+
+inline void* wrapperKey(DOMException* wrappableObject)
+{
+    return wrappableObject;
+}
+
+JSC::JSValue toJS(JSC::JSGlobalObject*, JSDOMGlobalObject*, DOMException&);
+inline JSC::JSValue toJS(JSC::JSGlobalObject* lexicalGlobalObject, JSDOMGlobalObject* globalObject, DOMException* impl) { return impl ? toJS(lexicalGlobalObject, globalObject, *impl) : JSC::jsNull(); }
+JSC::JSValue toJSNewlyCreated(JSC::JSGlobalObject*, JSDOMGlobalObject*, Ref<DOMException>&&);
+inline JSC::JSValue toJSNewlyCreated(JSC::JSGlobalObject* lexicalGlobalObject, JSDOMGlobalObject* globalObject, RefPtr<DOMException>&& impl) { return impl ? toJSNewlyCreated(lexicalGlobalObject, globalObject, impl.releaseNonNull()) : JSC::jsNull(); }
+
+template<> struct JSDOMWrapperConverterTraits<DOMException> {
+    using WrapperClass = JSDOMException;
+    using ToWrappedReturnType = DOMException*;
+};
+
+} // namespace WebCore
diff --git a/src/javascript/jsc/bindings/webcore/JSDOMGlobalObjectInlines.h b/src/javascript/jsc/bindings/webcore/JSDOMGlobalObjectInlines.h
new file mode 100644
index 000000000..313b14aa2
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/JSDOMGlobalObjectInlines.h
@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2021 Apple Inc. All Rights Reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#pragma once
+
+#include "DOMConstructors.h"
+#include "JSDOMGlobalObject.h"
+
+namespace WebCore {
+
+template<class ConstructorClass, DOMConstructorID constructorID>
+inline JSC::JSObject* getDOMConstructor(JSC::VM& vm, const Zig::GlobalObject& globalObject)
+{
+    // No locking is necessary unless we need to add a new constructor to Zig::GlobalObject::constructors().
+    if (JSC::JSObject* constructor = globalObject.constructors().array()[static_cast<unsigned>(constructorID)].get())
+        return constructor;
+    JSC::JSObject* constructor = ConstructorClass::create(vm, ConstructorClass::createStructure(vm, const_cast<Zig::GlobalObject&>(globalObject), ConstructorClass::prototypeForStructure(vm, globalObject)), const_cast<Zig::GlobalObject&>(globalObject));
+    ASSERT(!globalObject.constructors().array()[static_cast<unsigned>(constructorID)].get());
+    Zig::GlobalObject& mutableGlobalObject = const_cast<Zig::GlobalObject&>(globalObject);
+    mutableGlobalObject.constructors().array()[static_cast<unsigned>(constructorID)].set(vm, &globalObject, constructor);
+    return constructor;
+}
+
+} // namespace WebCore
diff --git a/src/javascript/jsc/bindings/webcore/JSDOMIterator.cpp b/src/javascript/jsc/bindings/webcore/JSDOMIterator.cpp
new file mode 100644
index 000000000..205e1c80a
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/JSDOMIterator.cpp
@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2016 Apple, Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "JSDOMIterator.h"
+
+#include "JavaScriptCore/ArrayPrototype.h"
+#include "JavaScriptCore/BuiltinNames.h"
+
+namespace WebCore {
+
+void addValueIterableMethods(JSC::JSGlobalObject& globalObject, JSC::JSObject& prototype)
+{
+    JSC::ArrayPrototype* arrayPrototype = globalObject.arrayPrototype();
+    ASSERT(arrayPrototype);
+
+    JSC::JSGlobalObject* lexicalGlobalObject = &globalObject;
+    ASSERT(lexicalGlobalObject);
+    JSC::VM& vm = lexicalGlobalObject->vm();
+
+    auto copyProperty = [&](const JSC::Identifier& arrayIdentifier, const JSC::Identifier& otherIdentifier, unsigned attributes = 0) {
+        JSC::JSValue value = arrayPrototype->getDirect(vm, arrayIdentifier);
+        ASSERT(value);
+        prototype.putDirect(vm, otherIdentifier, value, attributes);
+    };
+
+    copyProperty(vm.propertyNames->builtinNames().entriesPrivateName(), vm.propertyNames->builtinNames().entriesPublicName());
+    copyProperty(vm.propertyNames->builtinNames().forEachPrivateName(), vm.propertyNames->builtinNames().forEachPublicName());
+    copyProperty(vm.propertyNames->builtinNames().keysPrivateName(), vm.propertyNames->builtinNames().keysPublicName());
+    copyProperty(vm.propertyNames->builtinNames().valuesPrivateName(), vm.propertyNames->builtinNames().valuesPublicName());
+}
+
+}
diff --git a/src/javascript/jsc/bindings/webcore/JSDOMIterator.h b/src/javascript/jsc/bindings/webcore/JSDOMIterator.h
new file mode 100644
index 000000000..04b4c001b
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/JSDOMIterator.h
@@ -0,0 +1,275 @@
+/*
+ * Copyright (C) 2016 Canon, Inc. All rights reserved.
+ * Copyright (C) 2016-2022 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY CANON INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL CANON INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "JSDOMConvert.h"
+#include "JavaScriptCore/IteratorPrototype.h"
+#include "JavaScriptCore/PropertySlot.h"
+#include <type_traits>
+
+namespace WebCore {
+
+void addValueIterableMethods(JSC::JSGlobalObject&, JSC::JSObject&);
+
+enum class JSDOMIteratorType { Set,
+    Map };
+
+// struct IteratorTraits {
+//     static constexpr JSDOMIteratorType type = [Map|Set];
+//     using KeyType = [IDLType|void];
+//     using ValueType = [IDLType];
+// };
+
+template<typename T, typename U = void> using EnableIfMap = typename std::enable_if<T::type == JSDOMIteratorType::Map, U>::type;
+template<typename T, typename U = void> using EnableIfSet = typename std::enable_if<T::type == JSDOMIteratorType::Set, U>::type;
+
+template<typename JSWrapper, typename IteratorTraits> class JSDOMIteratorPrototype final : public JSC::JSNonFinalObject {
+public:
+    using Base = JSC::JSNonFinalObject;
+    using DOMWrapped = typename JSWrapper::DOMWrapped;
+
+    template<typename CellType, JSC::SubspaceAccess>
+    static JSC::GCClient::IsoSubspace* subspaceFor(JSC::VM& vm)
+    {
+        STATIC_ASSERT_ISO_SUBSPACE_SHARABLE(JSDOMIteratorPrototype, Base);
+        return &vm.plainObjectSpace();
+    }
+
+    static JSDOMIteratorPrototype* create(JSC::VM& vm, JSC::JSGlobalObject* globalObject, JSC::Structure* structure)
+    {
+        STATIC_ASSERT_ISO_SUBSPACE_SHARABLE(JSDOMIteratorPrototype, JSDOMIteratorPrototype::Base);
+        JSDOMIteratorPrototype* prototype = new (NotNull, JSC::allocateCell<JSDOMIteratorPrototype>(vm)) JSDOMIteratorPrototype(vm, structure);
+        prototype->finishCreation(vm, globalObject);
+        return prototype;
+    }
+
+    DECLARE_INFO;
+
+    static JSC::Structure* createStructure(JSC::VM& vm, JSC::JSGlobalObject* globalObject, JSC::JSValue prototype)
+    {
+        return JSC::Structure::create(vm, globalObject, prototype, JSC::TypeInfo(JSC::ObjectType, StructureFlags), info());
+    }
+
+    static JSC::EncodedJSValue JSC_HOST_CALL_ATTRIBUTES next(JSC::JSGlobalObject*, JSC::CallFrame*);
+
+private:
+    JSDOMIteratorPrototype(JSC::VM& vm, JSC::Structure* structure)
+        : Base(vm, structure)
+    {
+    }
+
+    void finishCreation(JSC::VM&, JSC::JSGlobalObject*);
+};
+
+using IterationKind = JSC::IterationKind;
+
+template<typename JSWrapper, typename IteratorTraits> class JSDOMIteratorBase : public JSDOMObject {
+public:
+    using Base = JSDOMObject;
+
+    using Wrapper = JSWrapper;
+    using Traits = IteratorTraits;
+
+    using DOMWrapped = typename Wrapper::DOMWrapped;
+    using Prototype = JSDOMIteratorPrototype<Wrapper, Traits>;
+
+    DECLARE_INFO;
+
+    static Prototype* createPrototype(JSC::VM& vm, JSC::JSGlobalObject& globalObject)
+    {
+        return Prototype::create(vm, &globalObject, Prototype::createStructure(vm, &globalObject, globalObject.iteratorPrototype()));
+    }
+
+    JSC::JSValue next(JSC::JSGlobalObject&);
+
+    static void createStructure(JSC::VM&, JSC::JSGlobalObject*, JSC::JSValue); // Make use of createStructure for this compile-error.
+
+protected:
+    JSDOMIteratorBase(JSC::Structure* structure, JSWrapper& iteratedObject, IterationKind kind)
+        : Base(structure, *iteratedObject.globalObject())
+        , m_iterator(iteratedObject.wrapped().createIterator())
+        , m_kind(kind)
+    {
+    }
+
+    template<typename IteratorValue, typename T = Traits> EnableIfMap<T, JSC::JSValue> asJS(JSC::JSGlobalObject&, IteratorValue&);
+    template<typename IteratorValue, typename T = Traits> EnableIfSet<T, JSC::JSValue> asJS(JSC::JSGlobalObject&, IteratorValue&);
+
+    static void destroy(JSC::JSCell*);
+
+    std::optional<typename DOMWrapped::Iterator> m_iterator;
+    IterationKind m_kind;
+};
+
+inline JSC::JSValue jsPair(JSC::JSGlobalObject&, JSDOMGlobalObject& globalObject, JSC::JSValue value1, JSC::JSValue value2)
+{
+    JSC::MarkedArgumentBuffer arguments;
+    arguments.append(value1);
+    arguments.append(value2);
+    ASSERT(!arguments.hasOverflowed());
+    return constructArray(&globalObject, static_cast<JSC::ArrayAllocationProfile*>(nullptr), arguments);
+}
+
+template<typename FirstType, typename SecondType, typename T, typename U>
+inline JSC::JSValue jsPair(JSC::JSGlobalObject& lexicalGlobalObject, JSDOMGlobalObject& globalObject, const T& value1, const U& value2)
+{
+    return jsPair(lexicalGlobalObject, globalObject, toJS<FirstType>(lexicalGlobalObject, globalObject, value1), toJS<SecondType>(lexicalGlobalObject, globalObject, value2));
+}
+
+template<typename JSIterator> JSC::JSValue iteratorCreate(typename JSIterator::Wrapper&, IterationKind);
+template<typename JSIterator> JSC::JSValue iteratorForEach(JSC::JSGlobalObject&, JSC::CallFrame&, typename JSIterator::Wrapper&);
+
+template<typename JSIterator> JSC::JSValue iteratorCreate(typename JSIterator::Wrapper& thisObject, IterationKind kind)
+{
+    ASSERT(thisObject.globalObject());
+    JSDOMGlobalObject& globalObject = *thisObject.globalObject();
+    return JSIterator::create(globalObject.vm(), getDOMStructure<JSIterator>(globalObject.vm(), globalObject), thisObject, kind);
+}
+
+template<typename JSWrapper, typename IteratorTraits>
+template<typename IteratorValue, typename T> inline EnableIfMap<T, JSC::JSValue> JSDOMIteratorBase<JSWrapper, IteratorTraits>::asJS(JSC::JSGlobalObject& lexicalGlobalObject, IteratorValue& value)
+{
+    ASSERT(value);
+
+    switch (m_kind) {
+    case IterationKind::Keys:
+        return toJS<typename Traits::KeyType>(lexicalGlobalObject, *globalObject(), value->key);
+    case IterationKind::Values:
+        return toJS<typename Traits::ValueType>(lexicalGlobalObject, *globalObject(), value->value);
+    case IterationKind::Entries:
+        return jsPair<typename Traits::KeyType, typename Traits::ValueType>(lexicalGlobalObject, *globalObject(), value->key, value->value);
+    };
+
+    ASSERT_NOT_REACHED();
+    return {};
+}
+
+template<typename JSWrapper, typename IteratorTraits>
+template<typename IteratorValue, typename T> inline EnableIfSet<T, JSC::JSValue> JSDOMIteratorBase<JSWrapper, IteratorTraits>::asJS(JSC::JSGlobalObject& lexicalGlobalObject, IteratorValue& value)
+{
+    ASSERT(value);
+
+    auto globalObject = this->globalObject();
+    auto result = toJS<typename Traits::ValueType>(lexicalGlobalObject, *globalObject, value);
+
+    switch (m_kind) {
+    case IterationKind::Keys:
+    case IterationKind::Values:
+        return result;
+    case IterationKind::Entries:
+        return jsPair(lexicalGlobalObject, *globalObject, result, result);
+    };
+
+    ASSERT_NOT_REACHED();
+    return {};
+}
+
+template<typename JSIterator, typename IteratorValue> EnableIfMap<typename JSIterator::Traits> appendForEachArguments(JSC::JSGlobalObject& lexicalGlobalObject, JSDOMGlobalObject& globalObject, JSC::MarkedArgumentBuffer& arguments, IteratorValue& value)
+{
+    ASSERT(value);
+    arguments.append(toJS<typename JSIterator::Traits::ValueType>(lexicalGlobalObject, globalObject, value->value));
+    arguments.append(toJS<typename JSIterator::Traits::KeyType>(lexicalGlobalObject, globalObject, value->key));
+}
+
+template<typename JSIterator, typename IteratorValue> EnableIfSet<typename JSIterator::Traits> appendForEachArguments(JSC::JSGlobalObject& lexicalGlobalObject, JSDOMGlobalObject& globalObject, JSC::MarkedArgumentBuffer& arguments, IteratorValue& value)
+{
+    ASSERT(value);
+    auto argument = toJS<typename JSIterator::Traits::ValueType>(lexicalGlobalObject, globalObject, value);
+    arguments.append(argument);
+    arguments.append(argument);
+}
+
+template<typename JSIterator> JSC::JSValue iteratorForEach(JSC::JSGlobalObject& lexicalGlobalObject, JSC::CallFrame& callFrame, typename JSIterator::Wrapper& thisObject)
+{
+    auto& vm = JSC::getVM(&lexicalGlobalObject);
+    auto scope = DECLARE_THROW_SCOPE(vm);
+    JSC::JSValue callback = callFrame.argument(0);
+    JSC::JSValue thisValue = callFrame.argument(1);
+
+    auto callData = JSC::getCallData(JSC::getVM(&lexicalGlobalObject), callback);
+    if (callData.type == JSC::CallData::Type::None)
+        return throwTypeError(&lexicalGlobalObject, scope, "Cannot call callback"_s);
+
+    auto iterator = thisObject.wrapped().createIterator();
+    while (auto value = iterator.next()) {
+        JSC::MarkedArgumentBuffer arguments;
+        appendForEachArguments<JSIterator>(lexicalGlobalObject, *thisObject.globalObject(), arguments, value);
+        arguments.append(&thisObject);
+        if (UNLIKELY(arguments.hasOverflowed())) {
+            throwOutOfMemoryError(&lexicalGlobalObject, scope);
+            return {};
+        }
+        JSC::call(&lexicalGlobalObject, callback, callData, thisValue, arguments);
+        if (UNLIKELY(scope.exception()))
+            break;
+    }
+    return JSC::jsUndefined();
+}
+
+template<typename JSWrapper, typename IteratorTraits>
+void JSDOMIteratorBase<JSWrapper, IteratorTraits>::destroy(JSCell* cell)
+{
+    JSDOMIteratorBase<JSWrapper, IteratorTraits>* thisObject = static_cast<JSDOMIteratorBase<JSWrapper, IteratorTraits>*>(cell);
+    thisObject->JSDOMIteratorBase<JSWrapper, IteratorTraits>::~JSDOMIteratorBase();
+}
+
+template<typename JSWrapper, typename IteratorTraits>
+JSC::JSValue JSDOMIteratorBase<JSWrapper, IteratorTraits>::next(JSC::JSGlobalObject& lexicalGlobalObject)
+{
+    if (m_iterator) {
+        auto iteratorValue = m_iterator->next();
+        if (iteratorValue)
+            return createIteratorResultObject(&lexicalGlobalObject, asJS(lexicalGlobalObject, iteratorValue), false);
+        m_iterator = std::nullopt;
+    }
+    return createIteratorResultObject(&lexicalGlobalObject, JSC::jsUndefined(), true);
+}
+
+template<typename JSWrapper, typename IteratorTraits>
+JSC::EncodedJSValue JSC_HOST_CALL_ATTRIBUTES JSDOMIteratorPrototype<JSWrapper, IteratorTraits>::next(JSC::JSGlobalObject* globalObject, JSC::CallFrame* callFrame)
+{
+    JSC::VM& vm = globalObject->vm();
+    auto scope = DECLARE_THROW_SCOPE(vm);
+
+    auto iterator = JSC::jsDynamicCast<JSDOMIteratorBase<JSWrapper, IteratorTraits>*>(vm, callFrame->thisValue());
+    if (!iterator)
+        return JSC::JSValue::encode(throwTypeError(globalObject, scope, "Cannot call next() on a non-Iterator object"_s));
+
+    return JSC::JSValue::encode(iterator->next(*globalObject));
+}
+
+template<typename JSWrapper, typename IteratorTraits>
+void JSDOMIteratorPrototype<JSWrapper, IteratorTraits>::finishCreation(JSC::VM& vm, JSC::JSGlobalObject* globalObject)
+{
+    Base::finishCreation(vm);
+    ASSERT(inherits(vm, info()));
+
+    JSC_NATIVE_INTRINSIC_FUNCTION_WITHOUT_TRANSITION(vm.propertyNames->next, next, 0, 0, JSC::NoIntrinsic);
+    JSC_TO_STRING_TAG_WITHOUT_TRANSITION();
+}
+
+}
diff --git a/src/javascript/jsc/bindings/webcore/JSDOMOperation.h b/src/javascript/jsc/bindings/webcore/JSDOMOperation.h
new file mode 100644
index 000000000..c3f6d0451
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/JSDOMOperation.h
@@ -0,0 +1,74 @@
+/*
+ *  Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
+ *  Copyright (C) 2003-2020 Apple Inc. All rights reserved.
+ *  Copyright (C) 2007 Samuel Weinig <sam@webkit.org>
+ *  Copyright (C) 2009 Google, Inc. All rights reserved.
+ *  Copyright (C) 2012 Ericsson AB. All rights reserved.
+ *  Copyright (C) 2013 Michael Pruett <michael@68k.org>
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#pragma once
+
+#include "JSDOMCastThisValue.h"
+#include "JSDOMExceptionHandling.h"
+
+namespace WebCore {
+
+template<typename JSClass>
+class IDLOperation {
+public:
+    using ClassParameter = JSClass*;
+    using Operation = JSC::EncodedJSValue(JSC::JSGlobalObject*, JSC::CallFrame*, ClassParameter);
+    using StaticOperation = JSC::EncodedJSValue(JSC::JSGlobalObject*, JSC::CallFrame*);
+
+    // FIXME: Remove this after FunctionCallResolveNode is fixed not to pass resolved scope as |this| value.
+    // https://bugs.webkit.org/show_bug.cgi?id=225397
+    static JSClass* cast(JSC::JSGlobalObject& lexicalGlobalObject, JSC::CallFrame& callFrame)
+    {
+        if constexpr (std::is_base_of_v<JSDOMGlobalObject, JSClass>)
+            return castThisValue<JSClass>(lexicalGlobalObject, callFrame.thisValue().toThis(&lexicalGlobalObject, JSC::ECMAMode::strict()));
+        else
+            return castThisValue<JSClass>(lexicalGlobalObject, callFrame.thisValue());
+    }
+
+    template<Operation operation, CastedThisErrorBehavior shouldThrow = CastedThisErrorBehavior::Throw>
+    static JSC::EncodedJSValue call(JSC::JSGlobalObject& lexicalGlobalObject, JSC::CallFrame& callFrame, const char* operationName)
+    {
+        auto throwScope = DECLARE_THROW_SCOPE(JSC::getVM(&lexicalGlobalObject));
+        
+        auto* thisObject = cast(lexicalGlobalObject, callFrame);
+        if constexpr (shouldThrow != CastedThisErrorBehavior::Assert) {
+            if (UNLIKELY(!thisObject))
+                return throwThisTypeError(lexicalGlobalObject, throwScope, JSClass::info()->className, operationName);
+        } else
+            ASSERT(thisObject);
+
+        ASSERT_GC_OBJECT_INHERITS(thisObject, JSClass::info());
+        
+        // FIXME: We should refactor the binding generated code to use references for lexicalGlobalObject and thisObject.
+        RELEASE_AND_RETURN(throwScope, (operation(&lexicalGlobalObject, &callFrame, thisObject)));
+    }
+
+    template<StaticOperation operation, CastedThisErrorBehavior shouldThrow = CastedThisErrorBehavior::Throw>
+    static JSC::EncodedJSValue callStatic(JSC::JSGlobalObject& lexicalGlobalObject, JSC::CallFrame& callFrame, const char*)
+    {
+        // FIXME: We should refactor the binding generated code to use references for lexicalGlobalObject.
+        return operation(&lexicalGlobalObject, &callFrame);
+    }
+};
+
+} // namespace WebCore
diff --git a/src/javascript/jsc/bindings/webcore/JSDOMURL.cpp b/src/javascript/jsc/bindings/webcore/JSDOMURL.cpp
new file mode 100644
index 000000000..b7efa19ae
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/JSDOMURL.cpp
@@ -0,0 +1,846 @@
+/*
+    This file is part of the WebKit open source project.
+    This file has been generated by generate-bindings.pl. DO NOT MODIFY!
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Library General Public
+    License as published by the Free Software Foundation; either
+    version 2 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Library General Public License for more details.
+
+    You should have received a copy of the GNU Library General Public License
+    along with this library; see the file COPYING.LIB.  If not, write to
+    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+    Boston, MA 02110-1301, USA.
+*/
+
+#include "root.h"
+#include "JSDOMURL.h"
+
+#include "ActiveDOMObject.h"
+#include "ExtendedDOMClientIsoSubspaces.h"
+#include "ExtendedDOMIsoSubspaces.h"
+#include "IDLTypes.h"
+// #include "JSBlob.h"
+#include "JSDOMAttribute.h"
+#include "JSDOMBinding.h"
+#include "JSDOMConstructor.h"
+#include "JSDOMConvertBase.h"
+#include "JSDOMConvertInterface.h"
+#include "JSDOMConvertStrings.h"
+#include "JSDOMExceptionHandling.h"
+#include "JSDOMGlobalObject.h"
+#include "JSDOMGlobalObjectInlines.h"
+#include "JSDOMOperation.h"
+#include "JSDOMURL.h"
+#include "JSDOMWrapperCache.h"
+#include "JSURLSearchParams.h"
+#include "ScriptExecutionContext.h"
+#include "WebCoreJSClientData.h"
+#include "JavaScriptCore/FunctionPrototype.h"
+#include "JavaScriptCore/HeapAnalyzer.h"
+#include "JavaScriptCore/JSCInlines.h"
+#include "JavaScriptCore/JSDestructibleObjectHeapCellType.h"
+#include "JavaScriptCore/SlotVisitorMacros.h"
+#include "JavaScriptCore/SubspaceInlines.h"
+#include "wtf/GetPtr.h"
+#include "wtf/PointerPreparations.h"
+#include "wtf/URL.h"
+
+#if ENABLE(MEDIA_SOURCE)
+#include "DOMURLMediaSource.h"
+#include "JSMediaSource.h"
+#endif
+
+namespace WebCore {
+using namespace JSC;
+
+// Functions
+
+static JSC_DECLARE_HOST_FUNCTION(jsDOMURLPrototypeFunction_toJSON);
+static JSC_DECLARE_HOST_FUNCTION(jsDOMURLConstructorFunction_createObjectURL);
+static JSC_DECLARE_HOST_FUNCTION(jsDOMURLConstructorFunction_revokeObjectURL);
+static JSC_DECLARE_HOST_FUNCTION(jsDOMURLPrototypeFunction_toString);
+
+// Attributes
+
+static JSC_DECLARE_CUSTOM_GETTER(jsDOMURLConstructor);
+static JSC_DECLARE_CUSTOM_GETTER(jsDOMURL_href);
+static JSC_DECLARE_CUSTOM_SETTER(setJSDOMURL_href);
+static JSC_DECLARE_CUSTOM_GETTER(jsDOMURL_origin);
+static JSC_DECLARE_CUSTOM_GETTER(jsDOMURL_protocol);
+static JSC_DECLARE_CUSTOM_SETTER(setJSDOMURL_protocol);
+static JSC_DECLARE_CUSTOM_GETTER(jsDOMURL_username);
+static JSC_DECLARE_CUSTOM_SETTER(setJSDOMURL_username);
+static JSC_DECLARE_CUSTOM_GETTER(jsDOMURL_password);
+static JSC_DECLARE_CUSTOM_SETTER(setJSDOMURL_password);
+static JSC_DECLARE_CUSTOM_GETTER(jsDOMURL_host);
+static JSC_DECLARE_CUSTOM_SETTER(setJSDOMURL_host);
+static JSC_DECLARE_CUSTOM_GETTER(jsDOMURL_hostname);
+static JSC_DECLARE_CUSTOM_SETTER(setJSDOMURL_hostname);
+static JSC_DECLARE_CUSTOM_GETTER(jsDOMURL_port);
+static JSC_DECLARE_CUSTOM_SETTER(setJSDOMURL_port);
+static JSC_DECLARE_CUSTOM_GETTER(jsDOMURL_pathname);
+static JSC_DECLARE_CUSTOM_SETTER(setJSDOMURL_pathname);
+static JSC_DECLARE_CUSTOM_GETTER(jsDOMURL_hash);
+static JSC_DECLARE_CUSTOM_SETTER(setJSDOMURL_hash);
+static JSC_DECLARE_CUSTOM_GETTER(jsDOMURL_search);
+static JSC_DECLARE_CUSTOM_SETTER(setJSDOMURL_search);
+static JSC_DECLARE_CUSTOM_GETTER(jsDOMURL_searchParams);
+
+class JSDOMURLPrototype final : public JSC::JSNonFinalObject {
+public:
+    using Base = JSC::JSNonFinalObject;
+    static JSDOMURLPrototype* create(JSC::VM& vm, JSDOMGlobalObject* globalObject, JSC::Structure* structure)
+    {
+        JSDOMURLPrototype* ptr = new (NotNull, JSC::allocateCell<JSDOMURLPrototype>(vm)) JSDOMURLPrototype(vm, globalObject, structure);
+        ptr->finishCreation(vm);
+        return ptr;
+    }
+
+    DECLARE_INFO;
+    template<typename CellType, JSC::SubspaceAccess>
+    static JSC::GCClient::IsoSubspace* subspaceFor(JSC::VM& vm)
+    {
+        STATIC_ASSERT_ISO_SUBSPACE_SHARABLE(JSDOMURLPrototype, Base);
+        return &vm.plainObjectSpace();
+    }
+    static JSC::Structure* createStructure(JSC::VM& vm, JSC::JSGlobalObject* globalObject, JSC::JSValue prototype)
+    {
+        return JSC::Structure::create(vm, globalObject, prototype, JSC::TypeInfo(JSC::ObjectType, StructureFlags), info());
+    }
+
+private:
+    JSDOMURLPrototype(JSC::VM& vm, JSC::JSGlobalObject*, JSC::Structure* structure)
+        : JSC::JSNonFinalObject(vm, structure)
+    {
+    }
+
+    void finishCreation(JSC::VM&);
+};
+STATIC_ASSERT_ISO_SUBSPACE_SHARABLE(JSDOMURLPrototype, JSDOMURLPrototype::Base);
+
+using JSDOMURLDOMConstructor = JSDOMConstructor<JSDOMURL>;
+
+/* Hash table for constructor */
+
+static const HashTableValue JSDOMURLConstructorTableValues[] = {
+    { "createObjectURL", static_cast<unsigned>(JSC::PropertyAttribute::Function), NoIntrinsic, { (intptr_t) static_cast<RawNativeFunction>(jsDOMURLConstructorFunction_createObjectURL), (intptr_t)(1) } },
+    { "revokeObjectURL", static_cast<unsigned>(JSC::PropertyAttribute::Function), NoIntrinsic, { (intptr_t) static_cast<RawNativeFunction>(jsDOMURLConstructorFunction_revokeObjectURL), (intptr_t)(1) } },
+};
+
+static inline EncodedJSValue constructJSDOMURL1(JSGlobalObject* lexicalGlobalObject, CallFrame* callFrame)
+{
+    VM& vm = lexicalGlobalObject->vm();
+    auto throwScope = DECLARE_THROW_SCOPE(vm);
+    auto* castedThis = jsCast<JSDOMURLDOMConstructor*>(callFrame->jsCallee());
+    ASSERT(castedThis);
+    EnsureStillAliveScope argument0 = callFrame->uncheckedArgument(0);
+    auto url = convert<IDLUSVString>(*lexicalGlobalObject, argument0.value());
+    RETURN_IF_EXCEPTION(throwScope, encodedJSValue());
+    EnsureStillAliveScope argument1 = callFrame->argument(1);
+    auto base = argument1.value().isUndefined() ? String() : convert<IDLUSVString>(*lexicalGlobalObject, argument1.value());
+    RETURN_IF_EXCEPTION(throwScope, encodedJSValue());
+    auto object = DOMURL::create(WTFMove(url), WTFMove(base));
+    if constexpr (IsExceptionOr<decltype(object)>)
+        RETURN_IF_EXCEPTION(throwScope, {});
+    static_assert(TypeOrExceptionOrUnderlyingType<decltype(object)>::isRef);
+    auto jsValue = toJSNewlyCreated<IDLInterface<DOMURL>>(*lexicalGlobalObject, *castedThis->globalObject(), throwScope, WTFMove(object));
+    if constexpr (IsExceptionOr<decltype(object)>)
+        RETURN_IF_EXCEPTION(throwScope, {});
+    setSubclassStructureIfNeeded<DOMURL>(lexicalGlobalObject, callFrame, asObject(jsValue));
+    RETURN_IF_EXCEPTION(throwScope, {});
+    return JSValue::encode(jsValue);
+}
+
+static inline EncodedJSValue constructJSDOMURL2(JSGlobalObject* lexicalGlobalObject, CallFrame* callFrame)
+{
+    VM& vm = lexicalGlobalObject->vm();
+    auto throwScope = DECLARE_THROW_SCOPE(vm);
+    auto* castedThis = jsCast<JSDOMURLDOMConstructor*>(callFrame->jsCallee());
+    ASSERT(castedThis);
+    EnsureStillAliveScope argument0 = callFrame->uncheckedArgument(0);
+    auto url = convert<IDLUSVString>(*lexicalGlobalObject, argument0.value());
+    RETURN_IF_EXCEPTION(throwScope, encodedJSValue());
+    EnsureStillAliveScope argument1 = callFrame->uncheckedArgument(1);
+    auto base = convert<IDLInterface<DOMURL>>(*lexicalGlobalObject, argument1.value(), [](JSC::JSGlobalObject& lexicalGlobalObject, JSC::ThrowScope& scope) { throwArgumentTypeError(lexicalGlobalObject, scope, 1, "base", "URL", nullptr, "DOMURL"); });
+    RETURN_IF_EXCEPTION(throwScope, encodedJSValue());
+    auto object = DOMURL::create(WTFMove(url), *base);
+    if constexpr (IsExceptionOr<decltype(object)>)
+        RETURN_IF_EXCEPTION(throwScope, {});
+    static_assert(TypeOrExceptionOrUnderlyingType<decltype(object)>::isRef);
+    auto jsValue = toJSNewlyCreated<IDLInterface<DOMURL>>(*lexicalGlobalObject, *castedThis->globalObject(), throwScope, WTFMove(object));
+    if constexpr (IsExceptionOr<decltype(object)>)
+        RETURN_IF_EXCEPTION(throwScope, {});
+    setSubclassStructureIfNeeded<DOMURL>(lexicalGlobalObject, callFrame, asObject(jsValue));
+    RETURN_IF_EXCEPTION(throwScope, {});
+    return JSValue::encode(jsValue);
+}
+
+template<> EncodedJSValue JSC_HOST_CALL_ATTRIBUTES JSDOMURLDOMConstructor::construct(JSGlobalObject* lexicalGlobalObject, CallFrame* callFrame)
+{
+    VM& vm = lexicalGlobalObject->vm();
+    auto throwScope = DECLARE_THROW_SCOPE(vm);
+    UNUSED_PARAM(throwScope);
+    size_t argsCount = std::min<size_t>(2, callFrame->argumentCount());
+    if (argsCount == 1) {
+        RELEASE_AND_RETURN(throwScope, (constructJSDOMURL1(lexicalGlobalObject, callFrame)));
+    }
+    if (argsCount == 2) {
+        JSValue distinguishingArg = callFrame->uncheckedArgument(1);
+        if (distinguishingArg.isUndefined())
+            RELEASE_AND_RETURN(throwScope, (constructJSDOMURL1(lexicalGlobalObject, callFrame)));
+        if (distinguishingArg.isObject() && asObject(distinguishingArg)->inherits<JSDOMURL>(vm))
+            RELEASE_AND_RETURN(throwScope, (constructJSDOMURL2(lexicalGlobalObject, callFrame)));
+        RELEASE_AND_RETURN(throwScope, (constructJSDOMURL1(lexicalGlobalObject, callFrame)));
+    }
+    return argsCount < 1 ? throwVMError(lexicalGlobalObject, throwScope, createNotEnoughArgumentsError(lexicalGlobalObject)) : throwVMTypeError(lexicalGlobalObject, throwScope);
+}
+JSC_ANNOTATE_HOST_FUNCTION(JSDOMURLConstructorConstruct, JSDOMURLDOMConstructor::construct);
+
+template<> const ClassInfo JSDOMURLDOMConstructor::s_info = { "URL"_s, &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(JSDOMURLDOMConstructor) };
+
+template<> JSValue JSDOMURLDOMConstructor::prototypeForStructure(JSC::VM& vm, const JSDOMGlobalObject& globalObject)
+{
+    UNUSED_PARAM(vm);
+    return globalObject.functionPrototype();
+}
+
+template<> void JSDOMURLDOMConstructor::initializeProperties(VM& vm, JSDOMGlobalObject& globalObject)
+{
+    putDirect(vm, vm.propertyNames->length, jsNumber(1), JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::DontEnum);
+    JSString* nameString = jsNontrivialString(vm, "URL"_s);
+    m_originalName.set(vm, this, nameString);
+    putDirect(vm, vm.propertyNames->name, nameString, JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::DontEnum);
+    putDirect(vm, vm.propertyNames->prototype, JSDOMURL::prototype(vm, globalObject), JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::DontDelete);
+    reifyStaticProperties(vm, JSDOMURL::info(), JSDOMURLConstructorTableValues, *this);
+}
+
+/* Hash table for prototype */
+
+static const HashTableValue JSDOMURLPrototypeTableValues[] = {
+    { "constructor", static_cast<unsigned>(JSC::PropertyAttribute::DontEnum), NoIntrinsic, { (intptr_t) static_cast<PropertySlot::GetValueFunc>(jsDOMURLConstructor), (intptr_t) static_cast<PutPropertySlot::PutValueFunc>(0) } },
+    { "href", static_cast<unsigned>(JSC::PropertyAttribute::CustomAccessor | JSC::PropertyAttribute::DOMAttribute), NoIntrinsic, { (intptr_t) static_cast<PropertySlot::GetValueFunc>(jsDOMURL_href), (intptr_t) static_cast<PutPropertySlot::PutValueFunc>(setJSDOMURL_href) } },
+    { "origin", static_cast<unsigned>(JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::CustomAccessor | JSC::PropertyAttribute::DOMAttribute), NoIntrinsic, { (intptr_t) static_cast<PropertySlot::GetValueFunc>(jsDOMURL_origin), (intptr_t) static_cast<PutPropertySlot::PutValueFunc>(0) } },
+    { "protocol", static_cast<unsigned>(JSC::PropertyAttribute::CustomAccessor | JSC::PropertyAttribute::DOMAttribute), NoIntrinsic, { (intptr_t) static_cast<PropertySlot::GetValueFunc>(jsDOMURL_protocol), (intptr_t) static_cast<PutPropertySlot::PutValueFunc>(setJSDOMURL_protocol) } },
+    { "username", static_cast<unsigned>(JSC::PropertyAttribute::CustomAccessor | JSC::PropertyAttribute::DOMAttribute), NoIntrinsic, { (intptr_t) static_cast<PropertySlot::GetValueFunc>(jsDOMURL_username), (intptr_t) static_cast<PutPropertySlot::PutValueFunc>(setJSDOMURL_username) } },
+    { "password", static_cast<unsigned>(JSC::PropertyAttribute::CustomAccessor | JSC::PropertyAttribute::DOMAttribute), NoIntrinsic, { (intptr_t) static_cast<PropertySlot::GetValueFunc>(jsDOMURL_password), (intptr_t) static_cast<PutPropertySlot::PutValueFunc>(setJSDOMURL_password) } },
+    { "host", static_cast<unsigned>(JSC::PropertyAttribute::CustomAccessor | JSC::PropertyAttribute::DOMAttribute), NoIntrinsic, { (intptr_t) static_cast<PropertySlot::GetValueFunc>(jsDOMURL_host), (intptr_t) static_cast<PutPropertySlot::PutValueFunc>(setJSDOMURL_host) } },
+    { "hostname", static_cast<unsigned>(JSC::PropertyAttribute::CustomAccessor | JSC::PropertyAttribute::DOMAttribute), NoIntrinsic, { (intptr_t) static_cast<PropertySlot::GetValueFunc>(jsDOMURL_hostname), (intptr_t) static_cast<PutPropertySlot::PutValueFunc>(setJSDOMURL_hostname) } },
+    { "port", static_cast<unsigned>(JSC::PropertyAttribute::CustomAccessor | JSC::PropertyAttribute::DOMAttribute), NoIntrinsic, { (intptr_t) static_cast<PropertySlot::GetValueFunc>(jsDOMURL_port), (intptr_t) static_cast<PutPropertySlot::PutValueFunc>(setJSDOMURL_port) } },
+    { "pathname", static_cast<unsigned>(JSC::PropertyAttribute::CustomAccessor | JSC::PropertyAttribute::DOMAttribute), NoIntrinsic, { (intptr_t) static_cast<PropertySlot::GetValueFunc>(jsDOMURL_pathname), (intptr_t) static_cast<PutPropertySlot::PutValueFunc>(setJSDOMURL_pathname) } },
+    { "hash", static_cast<unsigned>(JSC::PropertyAttribute::CustomAccessor | JSC::PropertyAttribute::DOMAttribute), NoIntrinsic, { (intptr_t) static_cast<PropertySlot::GetValueFunc>(jsDOMURL_hash), (intptr_t) static_cast<PutPropertySlot::PutValueFunc>(setJSDOMURL_hash) } },
+    { "search", static_cast<unsigned>(JSC::PropertyAttribute::CustomAccessor | JSC::PropertyAttribute::DOMAttribute), NoIntrinsic, { (intptr_t) static_cast<PropertySlot::GetValueFunc>(jsDOMURL_search), (intptr_t) static_cast<PutPropertySlot::PutValueFunc>(setJSDOMURL_search) } },
+    { "searchParams", static_cast<unsigned>(JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::CustomAccessor | JSC::PropertyAttribute::DOMAttribute), NoIntrinsic, { (intptr_t) static_cast<PropertySlot::GetValueFunc>(jsDOMURL_searchParams), (intptr_t) static_cast<PutPropertySlot::PutValueFunc>(0) } },
+    { "toJSON", static_cast<unsigned>(JSC::PropertyAttribute::Function), NoIntrinsic, { (intptr_t) static_cast<RawNativeFunction>(jsDOMURLPrototypeFunction_toJSON), (intptr_t)(0) } },
+    { "toString", static_cast<unsigned>(JSC::PropertyAttribute::Function), NoIntrinsic, { (intptr_t) static_cast<RawNativeFunction>(jsDOMURLPrototypeFunction_toString), (intptr_t)(0) } },
+};
+
+const ClassInfo JSDOMURLPrototype::s_info = { "URL"_s, &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(JSDOMURLPrototype) };
+
+void JSDOMURLPrototype::finishCreation(VM& vm)
+{
+    Base::finishCreation(vm);
+    reifyStaticProperties(vm, JSDOMURL::info(), JSDOMURLPrototypeTableValues, *this);
+    JSC_TO_STRING_TAG_WITHOUT_TRANSITION();
+}
+
+const ClassInfo JSDOMURL::s_info = { "URL"_s, &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(JSDOMURL) };
+
+JSDOMURL::JSDOMURL(Structure* structure, JSDOMGlobalObject& globalObject, Ref<DOMURL>&& impl)
+    : JSDOMWrapper<DOMURL>(structure, globalObject, WTFMove(impl))
+{
+}
+
+void JSDOMURL::finishCreation(VM& vm)
+{
+    Base::finishCreation(vm);
+    ASSERT(inherits(vm, info()));
+
+    // static_assert(!std::is_base_of<ActiveDOMObject, DOMURL>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+}
+
+JSObject* JSDOMURL::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
+{
+    return JSDOMURLPrototype::create(vm, &globalObject, JSDOMURLPrototype::createStructure(vm, &globalObject, globalObject.objectPrototype()));
+}
+
+JSObject* JSDOMURL::prototype(VM& vm, JSDOMGlobalObject& globalObject)
+{
+    return getDOMPrototype<JSDOMURL>(vm, globalObject);
+}
+
+JSValue JSDOMURL::getConstructor(VM& vm, const JSGlobalObject* globalObject)
+{
+    return getDOMConstructor<JSDOMURLDOMConstructor, DOMConstructorID::DOMURL>(vm, *jsCast<const JSDOMGlobalObject*>(globalObject));
+}
+
+void JSDOMURL::destroy(JSC::JSCell* cell)
+{
+    JSDOMURL* thisObject = static_cast<JSDOMURL*>(cell);
+    thisObject->JSDOMURL::~JSDOMURL();
+}
+
+JSC_DEFINE_CUSTOM_GETTER(jsDOMURLConstructor, (JSGlobalObject * lexicalGlobalObject, EncodedJSValue thisValue, PropertyName))
+{
+    VM& vm = JSC::getVM(lexicalGlobalObject);
+    auto throwScope = DECLARE_THROW_SCOPE(vm);
+    auto* prototype = jsDynamicCast<JSDOMURLPrototype*>(vm, JSValue::decode(thisValue));
+    if (UNLIKELY(!prototype))
+        return throwVMTypeError(lexicalGlobalObject, throwScope);
+    return JSValue::encode(JSDOMURL::getConstructor(JSC::getVM(lexicalGlobalObject), prototype->globalObject()));
+}
+
+static inline JSValue jsDOMURL_hrefGetter(JSGlobalObject& lexicalGlobalObject, JSDOMURL& thisObject)
+{
+    auto& vm = JSC::getVM(&lexicalGlobalObject);
+    auto throwScope = DECLARE_THROW_SCOPE(vm);
+    auto& impl = thisObject.wrapped();
+    RELEASE_AND_RETURN(throwScope, (toJS<IDLUSVString>(lexicalGlobalObject, throwScope, impl.href())));
+}
+
+JSC_DEFINE_CUSTOM_GETTER(jsDOMURL_href, (JSGlobalObject * lexicalGlobalObject, EncodedJSValue thisValue, PropertyName attributeName))
+{
+    return IDLAttribute<JSDOMURL>::get<jsDOMURL_hrefGetter, CastedThisErrorBehavior::Assert>(*lexicalGlobalObject, thisValue, attributeName);
+}
+
+static inline bool setJSDOMURL_hrefSetter(JSGlobalObject& lexicalGlobalObject, JSDOMURL& thisObject, JSValue value)
+{
+    auto& vm = JSC::getVM(&lexicalGlobalObject);
+    auto throwScope = DECLARE_THROW_SCOPE(vm);
+    auto& impl = thisObject.wrapped();
+    auto nativeValue = convert<IDLUSVString>(lexicalGlobalObject, value);
+    RETURN_IF_EXCEPTION(throwScope, false);
+    invokeFunctorPropagatingExceptionIfNecessary(lexicalGlobalObject, throwScope, [&] {
+        return impl.setHref(WTFMove(nativeValue));
+    });
+    return true;
+}
+
+JSC_DEFINE_CUSTOM_SETTER(setJSDOMURL_href, (JSGlobalObject * lexicalGlobalObject, EncodedJSValue thisValue, EncodedJSValue encodedValue, PropertyName attributeName))
+{
+    return IDLAttribute<JSDOMURL>::set<setJSDOMURL_hrefSetter>(*lexicalGlobalObject, thisValue, encodedValue, attributeName);
+}
+
+static inline JSValue jsDOMURL_originGetter(JSGlobalObject& lexicalGlobalObject, JSDOMURL& thisObject)
+{
+    auto& vm = JSC::getVM(&lexicalGlobalObject);
+    auto throwScope = DECLARE_THROW_SCOPE(vm);
+    auto& impl = thisObject.wrapped();
+    RELEASE_AND_RETURN(throwScope, (toJS<IDLUSVString>(lexicalGlobalObject, throwScope, impl.origin())));
+}
+
+JSC_DEFINE_CUSTOM_GETTER(jsDOMURL_origin, (JSGlobalObject * lexicalGlobalObject, EncodedJSValue thisValue, PropertyName attributeName))
+{
+    return IDLAttribute<JSDOMURL>::get<jsDOMURL_originGetter, CastedThisErrorBehavior::Assert>(*lexicalGlobalObject, thisValue, attributeName);
+}
+
+static inline JSValue jsDOMURL_protocolGetter(JSGlobalObject& lexicalGlobalObject, JSDOMURL& thisObject)
+{
+    auto& vm = JSC::getVM(&lexicalGlobalObject);
+    auto throwScope = DECLARE_THROW_SCOPE(vm);
+    auto& impl = thisObject.wrapped();
+    RELEASE_AND_RETURN(throwScope, (toJS<IDLUSVString>(lexicalGlobalObject, throwScope, impl.protocol())));
+}
+
+JSC_DEFINE_CUSTOM_GETTER(jsDOMURL_protocol, (JSGlobalObject * lexicalGlobalObject, EncodedJSValue thisValue, PropertyName attributeName))
+{
+    return IDLAttribute<JSDOMURL>::get<jsDOMURL_protocolGetter, CastedThisErrorBehavior::Assert>(*lexicalGlobalObject, thisValue, attributeName);
+}
+
+static inline bool setJSDOMURL_protocolSetter(JSGlobalObject& lexicalGlobalObject, JSDOMURL& thisObject, JSValue value)
+{
+    auto& vm = JSC::getVM(&lexicalGlobalObject);
+    auto throwScope = DECLARE_THROW_SCOPE(vm);
+    auto& impl = thisObject.wrapped();
+    auto nativeValue = convert<IDLUSVString>(lexicalGlobalObject, value);
+    RETURN_IF_EXCEPTION(throwScope, false);
+    invokeFunctorPropagatingExceptionIfNecessary(lexicalGlobalObject, throwScope, [&] {
+        return impl.setProtocol(WTFMove(nativeValue));
+    });
+    return true;
+}
+
+JSC_DEFINE_CUSTOM_SETTER(setJSDOMURL_protocol, (JSGlobalObject * lexicalGlobalObject, EncodedJSValue thisValue, EncodedJSValue encodedValue, PropertyName attributeName))
+{
+    return IDLAttribute<JSDOMURL>::set<setJSDOMURL_protocolSetter>(*lexicalGlobalObject, thisValue, encodedValue, attributeName);
+}
+
+static inline JSValue jsDOMURL_usernameGetter(JSGlobalObject& lexicalGlobalObject, JSDOMURL& thisObject)
+{
+    auto& vm = JSC::getVM(&lexicalGlobalObject);
+    auto throwScope = DECLARE_THROW_SCOPE(vm);
+    auto& impl = thisObject.wrapped();
+    RELEASE_AND_RETURN(throwScope, (toJS<IDLUSVString>(lexicalGlobalObject, throwScope, impl.username())));
+}
+
+JSC_DEFINE_CUSTOM_GETTER(jsDOMURL_username, (JSGlobalObject * lexicalGlobalObject, EncodedJSValue thisValue, PropertyName attributeName))
+{
+    return IDLAttribute<JSDOMURL>::get<jsDOMURL_usernameGetter, CastedThisErrorBehavior::Assert>(*lexicalGlobalObject, thisValue, attributeName);
+}
+
+static inline bool setJSDOMURL_usernameSetter(JSGlobalObject& lexicalGlobalObject, JSDOMURL& thisObject, JSValue value)
+{
+    auto& vm = JSC::getVM(&lexicalGlobalObject);
+    auto throwScope = DECLARE_THROW_SCOPE(vm);
+    auto& impl = thisObject.wrapped();
+    auto nativeValue = convert<IDLUSVString>(lexicalGlobalObject, value);
+    RETURN_IF_EXCEPTION(throwScope, false);
+    invokeFunctorPropagatingExceptionIfNecessary(lexicalGlobalObject, throwScope, [&] {
+        return impl.setUsername(WTFMove(nativeValue));
+    });
+    return true;
+}
+
+JSC_DEFINE_CUSTOM_SETTER(setJSDOMURL_username, (JSGlobalObject * lexicalGlobalObject, EncodedJSValue thisValue, EncodedJSValue encodedValue, PropertyName attributeName))
+{
+    return IDLAttribute<JSDOMURL>::set<setJSDOMURL_usernameSetter>(*lexicalGlobalObject, thisValue, encodedValue, attributeName);
+}
+
+static inline JSValue jsDOMURL_passwordGetter(JSGlobalObject& lexicalGlobalObject, JSDOMURL& thisObject)
+{
+    auto& vm = JSC::getVM(&lexicalGlobalObject);
+    auto throwScope = DECLARE_THROW_SCOPE(vm);
+    auto& impl = thisObject.wrapped();
+    RELEASE_AND_RETURN(throwScope, (toJS<IDLUSVString>(lexicalGlobalObject, throwScope, impl.password())));
+}
+
+JSC_DEFINE_CUSTOM_GETTER(jsDOMURL_password, (JSGlobalObject * lexicalGlobalObject, EncodedJSValue thisValue, PropertyName attributeName))
+{
+    return IDLAttribute<JSDOMURL>::get<jsDOMURL_passwordGetter, CastedThisErrorBehavior::Assert>(*lexicalGlobalObject, thisValue, attributeName);
+}
+
+static inline bool setJSDOMURL_passwordSetter(JSGlobalObject& lexicalGlobalObject, JSDOMURL& thisObject, JSValue value)
+{
+    auto& vm = JSC::getVM(&lexicalGlobalObject);
+    auto throwScope = DECLARE_THROW_SCOPE(vm);
+    auto& impl = thisObject.wrapped();
+    auto nativeValue = convert<IDLUSVString>(lexicalGlobalObject, value);
+    RETURN_IF_EXCEPTION(throwScope, false);
+    invokeFunctorPropagatingExceptionIfNecessary(lexicalGlobalObject, throwScope, [&] {
+        return impl.setPassword(WTFMove(nativeValue));
+    });
+    return true;
+}
+
+JSC_DEFINE_CUSTOM_SETTER(setJSDOMURL_password, (JSGlobalObject * lexicalGlobalObject, EncodedJSValue thisValue, EncodedJSValue encodedValue, PropertyName attributeName))
+{
+    return IDLAttribute<JSDOMURL>::set<setJSDOMURL_passwordSetter>(*lexicalGlobalObject, thisValue, encodedValue, attributeName);
+}
+
+static inline JSValue jsDOMURL_hostGetter(JSGlobalObject& lexicalGlobalObject, JSDOMURL& thisObject)
+{
+    auto& vm = JSC::getVM(&lexicalGlobalObject);
+    auto throwScope = DECLARE_THROW_SCOPE(vm);
+    auto& impl = thisObject.wrapped();
+    RELEASE_AND_RETURN(throwScope, (toJS<IDLUSVString>(lexicalGlobalObject, throwScope, impl.host())));
+}
+
+JSC_DEFINE_CUSTOM_GETTER(jsDOMURL_host, (JSGlobalObject * lexicalGlobalObject, EncodedJSValue thisValue, PropertyName attributeName))
+{
+    return IDLAttribute<JSDOMURL>::get<jsDOMURL_hostGetter, CastedThisErrorBehavior::Assert>(*lexicalGlobalObject, thisValue, attributeName);
+}
+
+static inline bool setJSDOMURL_hostSetter(JSGlobalObject& lexicalGlobalObject, JSDOMURL& thisObject, JSValue value)
+{
+    auto& vm = JSC::getVM(&lexicalGlobalObject);
+    auto throwScope = DECLARE_THROW_SCOPE(vm);
+    auto& impl = thisObject.wrapped();
+    auto nativeValue = convert<IDLUSVString>(lexicalGlobalObject, value);
+    RETURN_IF_EXCEPTION(throwScope, false);
+    invokeFunctorPropagatingExceptionIfNecessary(lexicalGlobalObject, throwScope, [&] {
+        return impl.setHost(WTFMove(nativeValue));
+    });
+    return true;
+}
+
+JSC_DEFINE_CUSTOM_SETTER(setJSDOMURL_host, (JSGlobalObject * lexicalGlobalObject, EncodedJSValue thisValue, EncodedJSValue encodedValue, PropertyName attributeName))
+{
+    return IDLAttribute<JSDOMURL>::set<setJSDOMURL_hostSetter>(*lexicalGlobalObject, thisValue, encodedValue, attributeName);
+}
+
+static inline JSValue jsDOMURL_hostnameGetter(JSGlobalObject& lexicalGlobalObject, JSDOMURL& thisObject)
+{
+    auto& vm = JSC::getVM(&lexicalGlobalObject);
+    auto throwScope = DECLARE_THROW_SCOPE(vm);
+    auto& impl = thisObject.wrapped();
+    RELEASE_AND_RETURN(throwScope, (toJS<IDLUSVString>(lexicalGlobalObject, throwScope, impl.hostname())));
+}
+
+JSC_DEFINE_CUSTOM_GETTER(jsDOMURL_hostname, (JSGlobalObject * lexicalGlobalObject, EncodedJSValue thisValue, PropertyName attributeName))
+{
+    return IDLAttribute<JSDOMURL>::get<jsDOMURL_hostnameGetter, CastedThisErrorBehavior::Assert>(*lexicalGlobalObject, thisValue, attributeName);
+}
+
+static inline bool setJSDOMURL_hostnameSetter(JSGlobalObject& lexicalGlobalObject, JSDOMURL& thisObject, JSValue value)
+{
+    auto& vm = JSC::getVM(&lexicalGlobalObject);
+    auto throwScope = DECLARE_THROW_SCOPE(vm);
+    auto& impl = thisObject.wrapped();
+    auto nativeValue = convert<IDLUSVString>(lexicalGlobalObject, value);
+    RETURN_IF_EXCEPTION(throwScope, false);
+    invokeFunctorPropagatingExceptionIfNecessary(lexicalGlobalObject, throwScope, [&] {
+        return impl.setHostname(WTFMove(nativeValue));
+    });
+    return true;
+}
+
+JSC_DEFINE_CUSTOM_SETTER(setJSDOMURL_hostname, (JSGlobalObject * lexicalGlobalObject, EncodedJSValue thisValue, EncodedJSValue encodedValue, PropertyName attributeName))
+{
+    return IDLAttribute<JSDOMURL>::set<setJSDOMURL_hostnameSetter>(*lexicalGlobalObject, thisValue, encodedValue, attributeName);
+}
+
+static inline JSValue jsDOMURL_portGetter(JSGlobalObject& lexicalGlobalObject, JSDOMURL& thisObject)
+{
+    auto& vm = JSC::getVM(&lexicalGlobalObject);
+    auto throwScope = DECLARE_THROW_SCOPE(vm);
+    auto& impl = thisObject.wrapped();
+    RELEASE_AND_RETURN(throwScope, (toJS<IDLUSVString>(lexicalGlobalObject, throwScope, impl.port())));
+}
+
+JSC_DEFINE_CUSTOM_GETTER(jsDOMURL_port, (JSGlobalObject * lexicalGlobalObject, EncodedJSValue thisValue, PropertyName attributeName))
+{
+    return IDLAttribute<JSDOMURL>::get<jsDOMURL_portGetter, CastedThisErrorBehavior::Assert>(*lexicalGlobalObject, thisValue, attributeName);
+}
+
+static inline bool setJSDOMURL_portSetter(JSGlobalObject& lexicalGlobalObject, JSDOMURL& thisObject, JSValue value)
+{
+    auto& vm = JSC::getVM(&lexicalGlobalObject);
+    auto throwScope = DECLARE_THROW_SCOPE(vm);
+    auto& impl = thisObject.wrapped();
+    auto nativeValue = convert<IDLUSVString>(lexicalGlobalObject, value);
+    RETURN_IF_EXCEPTION(throwScope, false);
+    invokeFunctorPropagatingExceptionIfNecessary(lexicalGlobalObject, throwScope, [&] {
+        return impl.setPort(WTFMove(nativeValue));
+    });
+    return true;
+}
+
+JSC_DEFINE_CUSTOM_SETTER(setJSDOMURL_port, (JSGlobalObject * lexicalGlobalObject, EncodedJSValue thisValue, EncodedJSValue encodedValue, PropertyName attributeName))
+{
+    return IDLAttribute<JSDOMURL>::set<setJSDOMURL_portSetter>(*lexicalGlobalObject, thisValue, encodedValue, attributeName);
+}
+
+static inline JSValue jsDOMURL_pathnameGetter(JSGlobalObject& lexicalGlobalObject, JSDOMURL& thisObject)
+{
+    auto& vm = JSC::getVM(&lexicalGlobalObject);
+    auto throwScope = DECLARE_THROW_SCOPE(vm);
+    auto& impl = thisObject.wrapped();
+    RELEASE_AND_RETURN(throwScope, (toJS<IDLUSVString>(lexicalGlobalObject, throwScope, impl.pathname())));
+}
+
+JSC_DEFINE_CUSTOM_GETTER(jsDOMURL_pathname, (JSGlobalObject * lexicalGlobalObject, EncodedJSValue thisValue, PropertyName attributeName))
+{
+    return IDLAttribute<JSDOMURL>::get<jsDOMURL_pathnameGetter, CastedThisErrorBehavior::Assert>(*lexicalGlobalObject, thisValue, attributeName);
+}
+
+static inline bool setJSDOMURL_pathnameSetter(JSGlobalObject& lexicalGlobalObject, JSDOMURL& thisObject, JSValue value)
+{
+    auto& vm = JSC::getVM(&lexicalGlobalObject);
+    auto throwScope = DECLARE_THROW_SCOPE(vm);
+    auto& impl = thisObject.wrapped();
+    auto nativeValue = convert<IDLUSVString>(lexicalGlobalObject, value);
+    RETURN_IF_EXCEPTION(throwScope, false);
+    invokeFunctorPropagatingExceptionIfNecessary(lexicalGlobalObject, throwScope, [&] {
+        return impl.setPathname(WTFMove(nativeValue));
+    });
+    return true;
+}
+
+JSC_DEFINE_CUSTOM_SETTER(setJSDOMURL_pathname, (JSGlobalObject * lexicalGlobalObject, EncodedJSValue thisValue, EncodedJSValue encodedValue, PropertyName attributeName))
+{
+    return IDLAttribute<JSDOMURL>::set<setJSDOMURL_pathnameSetter>(*lexicalGlobalObject, thisValue, encodedValue, attributeName);
+}
+
+static inline JSValue jsDOMURL_hashGetter(JSGlobalObject& lexicalGlobalObject, JSDOMURL& thisObject)
+{
+    auto& vm = JSC::getVM(&lexicalGlobalObject);
+    auto throwScope = DECLARE_THROW_SCOPE(vm);
+    auto& impl = thisObject.wrapped();
+    RELEASE_AND_RETURN(throwScope, (toJS<IDLUSVString>(lexicalGlobalObject, throwScope, impl.hash())));
+}
+
+JSC_DEFINE_CUSTOM_GETTER(jsDOMURL_hash, (JSGlobalObject * lexicalGlobalObject, EncodedJSValue thisValue, PropertyName attributeName))
+{
+    return IDLAttribute<JSDOMURL>::get<jsDOMURL_hashGetter, CastedThisErrorBehavior::Assert>(*lexicalGlobalObject, thisValue, attributeName);
+}
+
+static inline bool setJSDOMURL_hashSetter(JSGlobalObject& lexicalGlobalObject, JSDOMURL& thisObject, JSValue value)
+{
+    auto& vm = JSC::getVM(&lexicalGlobalObject);
+    auto throwScope = DECLARE_THROW_SCOPE(vm);
+    auto& impl = thisObject.wrapped();
+    auto nativeValue = convert<IDLUSVString>(lexicalGlobalObject, value);
+    RETURN_IF_EXCEPTION(throwScope, false);
+    invokeFunctorPropagatingExceptionIfNecessary(lexicalGlobalObject, throwScope, [&] {
+        return impl.setHash(WTFMove(nativeValue));
+    });
+    return true;
+}
+
+JSC_DEFINE_CUSTOM_SETTER(setJSDOMURL_hash, (JSGlobalObject * lexicalGlobalObject, EncodedJSValue thisValue, EncodedJSValue encodedValue, PropertyName attributeName))
+{
+    return IDLAttribute<JSDOMURL>::set<setJSDOMURL_hashSetter>(*lexicalGlobalObject, thisValue, encodedValue, attributeName);
+}
+
+static inline JSValue jsDOMURL_searchGetter(JSGlobalObject& lexicalGlobalObject, JSDOMURL& thisObject)
+{
+    auto& vm = JSC::getVM(&lexicalGlobalObject);
+    auto throwScope = DECLARE_THROW_SCOPE(vm);
+    auto& impl = thisObject.wrapped();
+    RELEASE_AND_RETURN(throwScope, (toJS<IDLUSVString>(lexicalGlobalObject, throwScope, impl.search())));
+}
+
+JSC_DEFINE_CUSTOM_GETTER(jsDOMURL_search, (JSGlobalObject * lexicalGlobalObject, EncodedJSValue thisValue, PropertyName attributeName))
+{
+    return IDLAttribute<JSDOMURL>::get<jsDOMURL_searchGetter, CastedThisErrorBehavior::Assert>(*lexicalGlobalObject, thisValue, attributeName);
+}
+
+static inline bool setJSDOMURL_searchSetter(JSGlobalObject& lexicalGlobalObject, JSDOMURL& thisObject, JSValue value)
+{
+    auto& vm = JSC::getVM(&lexicalGlobalObject);
+    auto throwScope = DECLARE_THROW_SCOPE(vm);
+    auto& impl = thisObject.wrapped();
+    auto nativeValue = convert<IDLUSVString>(lexicalGlobalObject, value);
+    RETURN_IF_EXCEPTION(throwScope, false);
+    invokeFunctorPropagatingExceptionIfNecessary(lexicalGlobalObject, throwScope, [&] {
+        return impl.setSearch(WTFMove(nativeValue));
+    });
+    return true;
+}
+
+JSC_DEFINE_CUSTOM_SETTER(setJSDOMURL_search, (JSGlobalObject * lexicalGlobalObject, EncodedJSValue thisValue, EncodedJSValue encodedValue, PropertyName attributeName))
+{
+    return IDLAttribute<JSDOMURL>::set<setJSDOMURL_searchSetter>(*lexicalGlobalObject, thisValue, encodedValue, attributeName);
+}
+
+static inline JSValue jsDOMURL_searchParamsGetter(JSGlobalObject& lexicalGlobalObject, JSDOMURL& thisObject)
+{
+    auto& vm = JSC::getVM(&lexicalGlobalObject);
+    auto throwScope = DECLARE_THROW_SCOPE(vm);
+    if (JSValue cachedValue = thisObject.m_searchParams.get())
+        return cachedValue;
+    auto& impl = thisObject.wrapped();
+    JSValue result = toJS<IDLInterface<URLSearchParams>>(lexicalGlobalObject, *thisObject.globalObject(), throwScope, impl.searchParams());
+    RETURN_IF_EXCEPTION(throwScope, {});
+    thisObject.m_searchParams.set(JSC::getVM(&lexicalGlobalObject), &thisObject, result);
+    return result;
+}
+
+JSC_DEFINE_CUSTOM_GETTER(jsDOMURL_searchParams, (JSGlobalObject * lexicalGlobalObject, EncodedJSValue thisValue, PropertyName attributeName))
+{
+    return IDLAttribute<JSDOMURL>::get<jsDOMURL_searchParamsGetter, CastedThisErrorBehavior::Assert>(*lexicalGlobalObject, thisValue, attributeName);
+}
+
+static inline JSC::EncodedJSValue jsDOMURLPrototypeFunction_toJSONBody(JSC::JSGlobalObject* lexicalGlobalObject, JSC::CallFrame* callFrame, typename IDLOperation<JSDOMURL>::ClassParameter castedThis)
+{
+    auto& vm = JSC::getVM(lexicalGlobalObject);
+    auto throwScope = DECLARE_THROW_SCOPE(vm);
+    UNUSED_PARAM(throwScope);
+    UNUSED_PARAM(callFrame);
+    auto& impl = castedThis->wrapped();
+    RELEASE_AND_RETURN(throwScope, JSValue::encode(toJS<IDLUSVString>(*lexicalGlobalObject, throwScope, impl.toJSON())));
+}
+
+JSC_DEFINE_HOST_FUNCTION(jsDOMURLPrototypeFunction_toJSON, (JSGlobalObject * lexicalGlobalObject, CallFrame* callFrame))
+{
+    return IDLOperation<JSDOMURL>::call<jsDOMURLPrototypeFunction_toJSONBody>(*lexicalGlobalObject, *callFrame, "toJSON");
+}
+
+static inline JSC::EncodedJSValue jsDOMURLConstructorFunction_createObjectURL1Body(JSC::JSGlobalObject* lexicalGlobalObject, JSC::CallFrame* callFrame)
+{
+    // auto& vm = JSC::getVM(lexicalGlobalObject);
+    // auto throwScope = DECLARE_THROW_SCOPE(vm);
+    // UNUSED_PARAM(throwScope);
+    // UNUSED_PARAM(callFrame);
+    // auto* context = jsCast<JSDOMGlobalObject*>(lexicalGlobalObject)->scriptExecutionContext();
+    // if (UNLIKELY(!context))
+    return JSValue::encode(jsUndefined());
+    // EnsureStillAliveScope argument0 = callFrame->uncheckedArgument(0);
+    // auto blob = convert<IDLInterface<Blob>>(*lexicalGlobalObject, argument0.value(), [](JSC::JSGlobalObject& lexicalGlobalObject, JSC::ThrowScope& scope) { throwArgumentTypeError(lexicalGlobalObject, scope, 0, "blob", "URL", "createObjectURL", "Blob"); });
+    // RETURN_IF_EXCEPTION(throwScope, encodedJSValue());
+    // RELEASE_AND_RETURN(throwScope, JSValue::encode(toJS<IDLDOMString>(*lexicalGlobalObject, throwScope, DOMURL::createObjectURL(*context, *blob))));
+}
+
+static inline JSC::EncodedJSValue jsDOMURLConstructorFunction_revokeObjectURLBody(JSC::JSGlobalObject* lexicalGlobalObject, JSC::CallFrame* callFrame)
+{
+    // auto& vm = JSC::getVM(lexicalGlobalObject);
+    // auto throwScope = DECLARE_THROW_SCOPE(vm);
+    // UNUSED_PARAM(throwScope);
+    // UNUSED_PARAM(callFrame);
+    // if (UNLIKELY(callFrame->argumentCount() < 1))
+    //     return throwVMError(lexicalGlobalObject, throwScope, createNotEnoughArgumentsError(lexicalGlobalObject));
+    // auto* context = jsCast<JSDOMGlobalObject*>(lexicalGlobalObject)->scriptExecutionContext();
+    // if (UNLIKELY(!context))
+    return JSValue::encode(jsUndefined());
+    // EnsureStillAliveScope argument0 = callFrame->uncheckedArgument(0);
+    // auto url = convert<IDLDOMString>(*lexicalGlobalObject, argument0.value());
+    // RETURN_IF_EXCEPTION(throwScope, encodedJSValue());
+    // RELEASE_AND_RETURN(throwScope, JSValue::encode(toJS<IDLUndefined>(*lexicalGlobalObject, throwScope, [&]() -> decltype(auto) { return DOMURL::revokeObjectURL(*context, WTFMove(url)); })));
+}
+
+JSC_DEFINE_HOST_FUNCTION(jsDOMURLConstructorFunction_revokeObjectURL, (JSGlobalObject * lexicalGlobalObject, CallFrame* callFrame))
+{
+    return IDLOperation<JSDOMURL>::callStatic<jsDOMURLConstructorFunction_revokeObjectURLBody>(*lexicalGlobalObject, *callFrame, "revokeObjectURL");
+}
+
+#if ENABLE(MEDIA_SOURCE)
+static inline JSC::EncodedJSValue jsDOMURLConstructorFunction_createObjectURL2Body(JSC::JSGlobalObject* lexicalGlobalObject, JSC::CallFrame* callFrame)
+{
+    // auto& vm = JSC::getVM(lexicalGlobalObject);
+    // auto throwScope = DECLARE_THROW_SCOPE(vm);
+    // UNUSED_PARAM(throwScope);
+    // UNUSED_PARAM(callFrame);
+    // auto* context = jsCast<JSDOMGlobalObject*>(lexicalGlobalObject)->scriptExecutionContext();
+    // if (UNLIKELY(!context))
+    return JSValue::encode(jsUndefined());
+    // EnsureStillAliveScope argument0 = callFrame->uncheckedArgument(0);
+    // auto source = convert<IDLInterface<MediaSource>>(*lexicalGlobalObject, argument0.value(), [](JSC::JSGlobalObject& lexicalGlobalObject, JSC::ThrowScope& scope) { throwArgumentTypeError(lexicalGlobalObject, scope, 0, "source", "URL", "createObjectURL", "MediaSource"); });
+    // RETURN_IF_EXCEPTION(throwScope, encodedJSValue());
+    // RELEASE_AND_RETURN(throwScope, JSValue::encode(toJS<IDLDOMString>(*lexicalGlobalObject, throwScope, WebCore::DOMURLMediaSource::createObjectURL(*context, *source))));
+}
+
+#endif
+
+static inline JSC::EncodedJSValue jsDOMURLConstructorFunction_createObjectURLOverloadDispatcher(JSC::JSGlobalObject* lexicalGlobalObject, JSC::CallFrame* callFrame)
+{
+    return JSValue::encode(jsUndefined());
+
+    //     auto& vm = JSC::getVM(lexicalGlobalObject);
+    //     auto throwScope = DECLARE_THROW_SCOPE(vm);
+    // UNUSED_PARAM(throwScope);
+    UNUSED_PARAM(callFrame);
+    //     size_t argsCount = std::min<size_t>(1, callFrame->argumentCount());
+    //     if (argsCount == 1) {
+    //         JSValue distinguishingArg = callFrame->uncheckedArgument(0);
+    //         if (distinguishingArg.isObject() && asObject(distinguishingArg)->inherits<JSBlob>(vm))
+    //             RELEASE_AND_RETURN(throwScope, (jsDOMURLConstructorFunction_createObjectURL1Body(lexicalGlobalObject, callFrame)));
+    // #if ENABLE(MEDIA_SOURCE)
+    //         if (distinguishingArg.isObject() && asObject(distinguishingArg)->inherits<JSMediaSource>(vm))
+    //             RELEASE_AND_RETURN(throwScope, (jsDOMURLConstructorFunction_createObjectURL2Body(lexicalGlobalObject, callFrame)));
+    // #endif
+    //     }
+    //     return argsCount < 1 ? throwVMError(lexicalGlobalObject, throwScope, createNotEnoughArgumentsError(lexicalGlobalObject)) : throwVMTypeError(lexicalGlobalObject, throwScope);
+}
+
+JSC_DEFINE_HOST_FUNCTION(jsDOMURLConstructorFunction_createObjectURL, (JSGlobalObject * lexicalGlobalObject, CallFrame* callFrame))
+{
+    return IDLOperation<JSDOMURL>::callStatic<jsDOMURLConstructorFunction_createObjectURLOverloadDispatcher>(*lexicalGlobalObject, *callFrame, "createObjectURL");
+}
+
+static inline JSC::EncodedJSValue jsDOMURLPrototypeFunction_toStringBody(JSC::JSGlobalObject* lexicalGlobalObject, JSC::CallFrame* callFrame, typename IDLOperation<JSDOMURL>::ClassParameter castedThis)
+{
+    auto& vm = JSC::getVM(lexicalGlobalObject);
+    auto throwScope = DECLARE_THROW_SCOPE(vm);
+    UNUSED_PARAM(throwScope);
+    UNUSED_PARAM(callFrame);
+    auto& impl = castedThis->wrapped();
+    RELEASE_AND_RETURN(throwScope, JSValue::encode(toJS<IDLUSVString>(*lexicalGlobalObject, throwScope, impl.href())));
+}
+
+JSC_DEFINE_HOST_FUNCTION(jsDOMURLPrototypeFunction_toString, (JSGlobalObject * lexicalGlobalObject, CallFrame* callFrame))
+{
+    return IDLOperation<JSDOMURL>::call<jsDOMURLPrototypeFunction_toStringBody>(*lexicalGlobalObject, *callFrame, "toString");
+}
+
+JSC::GCClient::IsoSubspace* JSDOMURL::subspaceForImpl(JSC::VM& vm)
+{
+    return WebCore::subspaceForImpl<JSDOMURL, UseCustomHeapCellType::No>(
+        vm,
+        [](auto& spaces) { return spaces.m_clientSubspaceForDOMURL.get(); },
+        [](auto& spaces, auto&& space) { spaces.m_clientSubspaceForDOMURL = WTFMove(space); },
+        [](auto& spaces) { return spaces.m_subspaceForDOMURL.get(); },
+        [](auto& spaces, auto&& space) { spaces.m_subspaceForDOMURL = WTFMove(space); });
+}
+
+template<typename Visitor>
+void JSDOMURL::visitChildrenImpl(JSCell* cell, Visitor& visitor)
+{
+    auto* thisObject = jsCast<JSDOMURL*>(cell);
+    ASSERT_GC_OBJECT_INHERITS(thisObject, info());
+    Base::visitChildren(thisObject, visitor);
+    visitor.append(thisObject->m_searchParams);
+}
+
+DEFINE_VISIT_CHILDREN(JSDOMURL);
+
+void JSDOMURL::analyzeHeap(JSCell* cell, HeapAnalyzer& analyzer)
+{
+    auto* thisObject = jsCast<JSDOMURL*>(cell);
+    analyzer.setWrappedObjectForCell(cell, &thisObject->wrapped());
+    // if (thisObject->scriptExecutionContext())
+    //     analyzer.setLabelForCell(cell, "url " + thisObject->scriptExecutionContext()->url().string());
+    Base::analyzeHeap(cell, analyzer);
+}
+
+JSDOMURLOwner::~JSDOMURLOwner()
+{
+}
+
+bool JSDOMURLOwner::isReachableFromOpaqueRoots(JSC::Handle<JSC::Unknown> handle, void*, AbstractSlotVisitor& visitor, const char** reason)
+{
+    UNUSED_PARAM(handle);
+    UNUSED_PARAM(visitor);
+    UNUSED_PARAM(reason);
+    return false;
+}
+
+void JSDOMURLOwner::finalize(JSC::Handle<JSC::Unknown> handle, void* context)
+{
+    auto* jsDOMURL = static_cast<JSDOMURL*>(handle.slot()->asCell());
+    auto& world = *static_cast<DOMWrapperWorld*>(context);
+    uncacheWrapper(world, &jsDOMURL->wrapped(), jsDOMURL);
+}
+
+#if ENABLE(BINDING_INTEGRITY)
+#if PLATFORM(WIN)
+#pragma warning(disable : 4483)
+extern "C" {
+extern void (*const __identifier("??_7DOMURL@WebCore@@6B@")[])();
+}
+#else
+extern "C" {
+extern void* _ZTVN7WebCore6DOMURLE[];
+}
+#endif
+#endif
+
+JSC::JSValue toJSNewlyCreated(JSC::JSGlobalObject*, JSDOMGlobalObject* globalObject, Ref<DOMURL>&& impl)
+{
+
+    if constexpr (std::is_polymorphic_v<DOMURL>) {
+#if ENABLE(BINDING_INTEGRITY)
+        const void* actualVTablePointer = getVTablePointer(impl.ptr());
+#if PLATFORM(WIN)
+        void* expectedVTablePointer = __identifier("??_7DOMURL@WebCore@@6B@");
+#else
+        void* expectedVTablePointer = &_ZTVN7WebCore6DOMURLE[2];
+#endif
+
+        // If you hit this assertion you either have a use after free bug, or
+        // DOMURL has subclasses. If DOMURL has subclasses that get passed
+        // to toJS() we currently require DOMURL you to opt out of binding hardening
+        // by adding the SkipVTableValidation attribute to the interface IDL definition
+        RELEASE_ASSERT(actualVTablePointer == expectedVTablePointer);
+#endif
+    }
+    return createWrapper<DOMURL>(globalObject, WTFMove(impl));
+}
+
+JSC::JSValue toJS(JSC::JSGlobalObject* lexicalGlobalObject, JSDOMGlobalObject* globalObject, DOMURL& impl)
+{
+    return wrap(lexicalGlobalObject, globalObject, impl);
+}
+
+DOMURL* JSDOMURL::toWrapped(JSC::VM& vm, JSC::JSValue value)
+{
+    if (auto* wrapper = jsDynamicCast<JSDOMURL*>(vm, value))
+        return &wrapper->wrapped();
+    return nullptr;
+}
+
+}
diff --git a/src/javascript/jsc/bindings/webcore/JSDOMURL.h b/src/javascript/jsc/bindings/webcore/JSDOMURL.h
new file mode 100644
index 000000000..e89add235
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/JSDOMURL.h
@@ -0,0 +1,98 @@
+/*
+    This file is part of the WebKit open source project.
+    This file has been generated by generate-bindings.pl. DO NOT MODIFY!
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Library General Public
+    License as published by the Free Software Foundation; either
+    version 2 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Library General Public License for more details.
+
+    You should have received a copy of the GNU Library General Public License
+    along with this library; see the file COPYING.LIB.  If not, write to
+    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+    Boston, MA 02110-1301, USA.
+*/
+
+#pragma once
+
+#include "DOMURL.h"
+#include "JSDOMWrapper.h"
+#include "wtf/NeverDestroyed.h"
+
+namespace WebCore {
+
+class WEBCORE_EXPORT JSDOMURL : public JSDOMWrapper<DOMURL> {
+public:
+    using Base = JSDOMWrapper<DOMURL>;
+    static JSDOMURL* create(JSC::Structure* structure, JSDOMGlobalObject* globalObject, Ref<DOMURL>&& impl)
+    {
+        JSDOMURL* ptr = new (NotNull, JSC::allocateCell<JSDOMURL>(globalObject->vm())) JSDOMURL(structure, *globalObject, WTFMove(impl));
+        ptr->finishCreation(globalObject->vm());
+        return ptr;
+    }
+
+    static JSC::JSObject* createPrototype(JSC::VM&, JSDOMGlobalObject&);
+    static JSC::JSObject* prototype(JSC::VM&, JSDOMGlobalObject&);
+    static DOMURL* toWrapped(JSC::VM&, JSC::JSValue);
+    static void destroy(JSC::JSCell*);
+
+    DECLARE_INFO;
+
+    static JSC::Structure* createStructure(JSC::VM& vm, JSC::JSGlobalObject* globalObject, JSC::JSValue prototype)
+    {
+        return JSC::Structure::create(vm, globalObject, prototype, JSC::TypeInfo(JSC::ObjectType, StructureFlags), info(), JSC::NonArray);
+    }
+
+    static JSC::JSValue getConstructor(JSC::VM&, const JSC::JSGlobalObject*);
+    mutable JSC::WriteBarrier<JSC::Unknown> m_searchParams;
+    template<typename, JSC::SubspaceAccess mode> static JSC::GCClient::IsoSubspace* subspaceFor(JSC::VM& vm)
+    {
+        if constexpr (mode == JSC::SubspaceAccess::Concurrently)
+            return nullptr;
+        return subspaceForImpl(vm);
+    }
+    static JSC::GCClient::IsoSubspace* subspaceForImpl(JSC::VM& vm);
+    DECLARE_VISIT_CHILDREN;
+
+    static void analyzeHeap(JSCell*, JSC::HeapAnalyzer&);
+
+protected:
+    JSDOMURL(JSC::Structure*, JSDOMGlobalObject&, Ref<DOMURL>&&);
+
+    void finishCreation(JSC::VM&);
+};
+
+class JSDOMURLOwner final : public JSC::WeakHandleOwner {
+public:
+    ~JSDOMURLOwner() final;
+    bool isReachableFromOpaqueRoots(JSC::Handle<JSC::Unknown>, void* context, JSC::AbstractSlotVisitor&, const char**) final;
+    void finalize(JSC::Handle<JSC::Unknown>, void* context) final;
+};
+
+inline JSC::WeakHandleOwner* wrapperOwner(DOMWrapperWorld&, DOMURL*)
+{
+    static NeverDestroyed<JSDOMURLOwner> owner;
+    return &owner.get();
+}
+
+inline void* wrapperKey(DOMURL* wrappableObject)
+{
+    return wrappableObject;
+}
+
+WEBCORE_EXPORT JSC::JSValue toJS(JSC::JSGlobalObject*, JSDOMGlobalObject*, DOMURL&);
+inline JSC::JSValue toJS(JSC::JSGlobalObject* lexicalGlobalObject, JSDOMGlobalObject* globalObject, DOMURL* impl) { return impl ? toJS(lexicalGlobalObject, globalObject, *impl) : JSC::jsNull(); }
+JSC::JSValue toJSNewlyCreated(JSC::JSGlobalObject*, JSDOMGlobalObject*, Ref<DOMURL>&&);
+inline JSC::JSValue toJSNewlyCreated(JSC::JSGlobalObject* lexicalGlobalObject, JSDOMGlobalObject* globalObject, RefPtr<DOMURL>&& impl) { return impl ? toJSNewlyCreated(lexicalGlobalObject, globalObject, impl.releaseNonNull()) : JSC::jsNull(); }
+
+template<> struct JSDOMWrapperConverterTraits<DOMURL> {
+    using WrapperClass = JSDOMURL;
+    using ToWrappedReturnType = DOMURL*;
+};
+
+} // namespace WebCore
diff --git a/src/javascript/jsc/bindings/webcore/JSURLSearchParams.cpp b/src/javascript/jsc/bindings/webcore/JSURLSearchParams.cpp
new file mode 100644
index 000000000..92311cf49
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/JSURLSearchParams.cpp
@@ -0,0 +1,559 @@
+/*
+    This file is part of the WebKit open source project.
+    This file has been generated by generate-bindings.pl. DO NOT MODIFY!
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Library General Public
+    License as published by the Free Software Foundation; either
+    version 2 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Library General Public License for more details.
+
+    You should have received a copy of the GNU Library General Public License
+    along with this library; see the file COPYING.LIB.  If not, write to
+    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+    Boston, MA 02110-1301, USA.
+*/
+
+#include "config.h"
+#include "JSURLSearchParams.h"
+
+#include "ActiveDOMObject.h"
+#include "ExtendedDOMClientIsoSubspaces.h"
+#include "ExtendedDOMIsoSubspaces.h"
+#include "IDLTypes.h"
+#include "JSDOMBinding.h"
+#include "JSDOMConstructor.h"
+#include "JSDOMConvertBase.h"
+#include "JSDOMConvertBoolean.h"
+#include "JSDOMConvertInterface.h"
+#include "JSDOMConvertNullable.h"
+#include "JSDOMConvertRecord.h"
+#include "JSDOMConvertSequences.h"
+#include "JSDOMConvertStrings.h"
+#include "JSDOMConvertUnion.h"
+#include "JSDOMExceptionHandling.h"
+#include "JSDOMGlobalObject.h"
+#include "JSDOMGlobalObjectInlines.h"
+#include "JSDOMIterator.h"
+#include "JSDOMOperation.h"
+#include "JSDOMWrapperCache.h"
+#include "JavaScriptCore/BuiltinNames.h"
+#include "JavaScriptCore/FunctionPrototype.h"
+#include "JavaScriptCore/HeapAnalyzer.h"
+#include "JavaScriptCore/JSArray.h"
+#include "JavaScriptCore/JSCInlines.h"
+#include "JavaScriptCore/JSDestructibleObjectHeapCellType.h"
+#include "JavaScriptCore/SlotVisitorMacros.h"
+#include "JavaScriptCore/SubspaceInlines.h"
+#include "ScriptExecutionContext.h"
+#include "WebCoreJSClientData.h"
+#include "wtf/GetPtr.h"
+#include "wtf/PointerPreparations.h"
+#include "wtf/URL.h"
+#include "wtf/Vector.h"
+#include <variant>
+
+namespace WebCore {
+using namespace JSC;
+
+// Functions
+
+static JSC_DECLARE_HOST_FUNCTION(jsURLSearchParamsPrototypeFunction_append);
+static JSC_DECLARE_HOST_FUNCTION(jsURLSearchParamsPrototypeFunction_delete);
+static JSC_DECLARE_HOST_FUNCTION(jsURLSearchParamsPrototypeFunction_get);
+static JSC_DECLARE_HOST_FUNCTION(jsURLSearchParamsPrototypeFunction_getAll);
+static JSC_DECLARE_HOST_FUNCTION(jsURLSearchParamsPrototypeFunction_has);
+static JSC_DECLARE_HOST_FUNCTION(jsURLSearchParamsPrototypeFunction_set);
+static JSC_DECLARE_HOST_FUNCTION(jsURLSearchParamsPrototypeFunction_sort);
+static JSC_DECLARE_HOST_FUNCTION(jsURLSearchParamsPrototypeFunction_entries);
+static JSC_DECLARE_HOST_FUNCTION(jsURLSearchParamsPrototypeFunction_keys);
+static JSC_DECLARE_HOST_FUNCTION(jsURLSearchParamsPrototypeFunction_values);
+static JSC_DECLARE_HOST_FUNCTION(jsURLSearchParamsPrototypeFunction_forEach);
+static JSC_DECLARE_HOST_FUNCTION(jsURLSearchParamsPrototypeFunction_toString);
+
+// Attributes
+
+static JSC_DECLARE_CUSTOM_GETTER(jsURLSearchParamsConstructor);
+
+class JSURLSearchParamsPrototype final : public JSC::JSNonFinalObject {
+public:
+    using Base = JSC::JSNonFinalObject;
+    static JSURLSearchParamsPrototype* create(JSC::VM& vm, JSDOMGlobalObject* globalObject, JSC::Structure* structure)
+    {
+        JSURLSearchParamsPrototype* ptr = new (NotNull, JSC::allocateCell<JSURLSearchParamsPrototype>(vm)) JSURLSearchParamsPrototype(vm, globalObject, structure);
+        ptr->finishCreation(vm);
+        return ptr;
+    }
+
+    DECLARE_INFO;
+    template<typename CellType, JSC::SubspaceAccess>
+    static JSC::GCClient::IsoSubspace* subspaceFor(JSC::VM& vm)
+    {
+        STATIC_ASSERT_ISO_SUBSPACE_SHARABLE(JSURLSearchParamsPrototype, Base);
+        return &vm.plainObjectSpace();
+    }
+    static JSC::Structure* createStructure(JSC::VM& vm, JSC::JSGlobalObject* globalObject, JSC::JSValue prototype)
+    {
+        return JSC::Structure::create(vm, globalObject, prototype, JSC::TypeInfo(JSC::ObjectType, StructureFlags), info());
+    }
+
+private:
+    JSURLSearchParamsPrototype(JSC::VM& vm, JSC::JSGlobalObject*, JSC::Structure* structure)
+        : JSC::JSNonFinalObject(vm, structure)
+    {
+    }
+
+    void finishCreation(JSC::VM&);
+};
+STATIC_ASSERT_ISO_SUBSPACE_SHARABLE(JSURLSearchParamsPrototype, JSURLSearchParamsPrototype::Base);
+
+using JSURLSearchParamsDOMConstructor = JSDOMConstructor<JSURLSearchParams>;
+
+template<> EncodedJSValue JSC_HOST_CALL_ATTRIBUTES JSURLSearchParamsDOMConstructor::construct(JSGlobalObject* lexicalGlobalObject, CallFrame* callFrame)
+{
+    VM& vm = lexicalGlobalObject->vm();
+    auto throwScope = DECLARE_THROW_SCOPE(vm);
+    auto* castedThis = jsCast<JSURLSearchParamsDOMConstructor*>(callFrame->jsCallee());
+    ASSERT(castedThis);
+    EnsureStillAliveScope argument0 = callFrame->argument(0);
+    auto init = argument0.value().isUndefined() ? emptyString() : convert<IDLUnion<IDLSequence<IDLSequence<IDLUSVString>>, IDLRecord<IDLUSVString, IDLUSVString>, IDLUSVString>>(*lexicalGlobalObject, argument0.value());
+    RETURN_IF_EXCEPTION(throwScope, encodedJSValue());
+    auto object = URLSearchParams::create(WTFMove(init));
+    if constexpr (IsExceptionOr<decltype(object)>)
+        RETURN_IF_EXCEPTION(throwScope, {});
+    static_assert(TypeOrExceptionOrUnderlyingType<decltype(object)>::isRef);
+    auto jsValue = toJSNewlyCreated<IDLInterface<URLSearchParams>>(*lexicalGlobalObject, *castedThis->globalObject(), throwScope, WTFMove(object));
+    if constexpr (IsExceptionOr<decltype(object)>)
+        RETURN_IF_EXCEPTION(throwScope, {});
+    setSubclassStructureIfNeeded<URLSearchParams>(lexicalGlobalObject, callFrame, asObject(jsValue));
+    RETURN_IF_EXCEPTION(throwScope, {});
+    return JSValue::encode(jsValue);
+}
+JSC_ANNOTATE_HOST_FUNCTION(JSURLSearchParamsDOMConstructorConstruct, JSURLSearchParamsDOMConstructor::construct);
+
+template<> const ClassInfo JSURLSearchParamsDOMConstructor::s_info = { "URLSearchParams"_s, &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(JSURLSearchParamsDOMConstructor) };
+
+template<> JSValue JSURLSearchParamsDOMConstructor::prototypeForStructure(JSC::VM& vm, const JSDOMGlobalObject& globalObject)
+{
+    UNUSED_PARAM(vm);
+    return globalObject.functionPrototype();
+}
+
+template<> void JSURLSearchParamsDOMConstructor::initializeProperties(VM& vm, JSDOMGlobalObject& globalObject)
+{
+    putDirect(vm, vm.propertyNames->length, jsNumber(0), JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::DontEnum);
+    JSString* nameString = jsNontrivialString(vm, "URLSearchParams"_s);
+    m_originalName.set(vm, this, nameString);
+    putDirect(vm, vm.propertyNames->name, nameString, JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::DontEnum);
+    putDirect(vm, vm.propertyNames->prototype, JSURLSearchParams::prototype(vm, globalObject), JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::DontDelete);
+}
+
+/* Hash table for prototype */
+
+static const HashTableValue JSURLSearchParamsPrototypeTableValues[] = {
+    { "constructor", static_cast<unsigned>(JSC::PropertyAttribute::DontEnum), NoIntrinsic, { (intptr_t) static_cast<PropertySlot::GetValueFunc>(jsURLSearchParamsConstructor), (intptr_t) static_cast<PutPropertySlot::PutValueFunc>(0) } },
+    { "append", static_cast<unsigned>(JSC::PropertyAttribute::Function), NoIntrinsic, { (intptr_t) static_cast<RawNativeFunction>(jsURLSearchParamsPrototypeFunction_append), (intptr_t)(2) } },
+    { "delete", static_cast<unsigned>(JSC::PropertyAttribute::Function), NoIntrinsic, { (intptr_t) static_cast<RawNativeFunction>(jsURLSearchParamsPrototypeFunction_delete), (intptr_t)(1) } },
+    { "get", static_cast<unsigned>(JSC::PropertyAttribute::Function), NoIntrinsic, { (intptr_t) static_cast<RawNativeFunction>(jsURLSearchParamsPrototypeFunction_get), (intptr_t)(1) } },
+    { "getAll", static_cast<unsigned>(JSC::PropertyAttribute::Function), NoIntrinsic, { (intptr_t) static_cast<RawNativeFunction>(jsURLSearchParamsPrototypeFunction_getAll), (intptr_t)(1) } },
+    { "has", static_cast<unsigned>(JSC::PropertyAttribute::Function), NoIntrinsic, { (intptr_t) static_cast<RawNativeFunction>(jsURLSearchParamsPrototypeFunction_has), (intptr_t)(1) } },
+    { "set", static_cast<unsigned>(JSC::PropertyAttribute::Function), NoIntrinsic, { (intptr_t) static_cast<RawNativeFunction>(jsURLSearchParamsPrototypeFunction_set), (intptr_t)(2) } },
+    { "sort", static_cast<unsigned>(JSC::PropertyAttribute::Function), NoIntrinsic, { (intptr_t) static_cast<RawNativeFunction>(jsURLSearchParamsPrototypeFunction_sort), (intptr_t)(0) } },
+    { "entries", static_cast<unsigned>(JSC::PropertyAttribute::Function), NoIntrinsic, { (intptr_t) static_cast<RawNativeFunction>(jsURLSearchParamsPrototypeFunction_entries), (intptr_t)(0) } },
+    { "keys", static_cast<unsigned>(JSC::PropertyAttribute::Function), NoIntrinsic, { (intptr_t) static_cast<RawNativeFunction>(jsURLSearchParamsPrototypeFunction_keys), (intptr_t)(0) } },
+    { "values", static_cast<unsigned>(JSC::PropertyAttribute::Function), NoIntrinsic, { (intptr_t) static_cast<RawNativeFunction>(jsURLSearchParamsPrototypeFunction_values), (intptr_t)(0) } },
+    { "forEach", static_cast<unsigned>(JSC::PropertyAttribute::Function), NoIntrinsic, { (intptr_t) static_cast<RawNativeFunction>(jsURLSearchParamsPrototypeFunction_forEach), (intptr_t)(1) } },
+    { "toString", static_cast<unsigned>(JSC::PropertyAttribute::Function), NoIntrinsic, { (intptr_t) static_cast<RawNativeFunction>(jsURLSearchParamsPrototypeFunction_toString), (intptr_t)(0) } },
+};
+
+const ClassInfo JSURLSearchParamsPrototype::s_info = { "URLSearchParams"_s, &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(JSURLSearchParamsPrototype) };
+
+void JSURLSearchParamsPrototype::finishCreation(VM& vm)
+{
+    Base::finishCreation(vm);
+    reifyStaticProperties(vm, JSURLSearchParams::info(), JSURLSearchParamsPrototypeTableValues, *this);
+    putDirect(vm, vm.propertyNames->iteratorSymbol, getDirect(vm, vm.propertyNames->builtinNames().entriesPublicName()), static_cast<unsigned>(JSC::PropertyAttribute::DontEnum));
+    JSC_TO_STRING_TAG_WITHOUT_TRANSITION();
+}
+
+const ClassInfo JSURLSearchParams::s_info = { "URLSearchParams"_s, &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(JSURLSearchParams) };
+
+JSURLSearchParams::JSURLSearchParams(Structure* structure, JSDOMGlobalObject& globalObject, Ref<URLSearchParams>&& impl)
+    : JSDOMWrapper<URLSearchParams>(structure, globalObject, WTFMove(impl))
+{
+}
+
+void JSURLSearchParams::finishCreation(VM& vm)
+{
+    Base::finishCreation(vm);
+    ASSERT(inherits(vm, info()));
+
+    // static_assert(!std::is_base_of<ActiveDOMObject, URLSearchParams>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+}
+
+JSObject* JSURLSearchParams::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
+{
+    return JSURLSearchParamsPrototype::create(vm, &globalObject, JSURLSearchParamsPrototype::createStructure(vm, &globalObject, globalObject.objectPrototype()));
+}
+
+JSObject* JSURLSearchParams::prototype(VM& vm, JSDOMGlobalObject& globalObject)
+{
+    return getDOMPrototype<JSURLSearchParams>(vm, globalObject);
+}
+
+JSValue JSURLSearchParams::getConstructor(VM& vm, const JSGlobalObject* globalObject)
+{
+    return getDOMConstructor<JSURLSearchParamsDOMConstructor, DOMConstructorID::URLSearchParams>(vm, *jsCast<const JSDOMGlobalObject*>(globalObject));
+}
+
+void JSURLSearchParams::destroy(JSC::JSCell* cell)
+{
+    JSURLSearchParams* thisObject = static_cast<JSURLSearchParams*>(cell);
+    thisObject->JSURLSearchParams::~JSURLSearchParams();
+}
+
+JSC_DEFINE_CUSTOM_GETTER(jsURLSearchParamsConstructor, (JSGlobalObject * lexicalGlobalObject, EncodedJSValue thisValue, PropertyName))
+{
+    VM& vm = JSC::getVM(lexicalGlobalObject);
+    auto throwScope = DECLARE_THROW_SCOPE(vm);
+    auto* prototype = jsDynamicCast<JSURLSearchParamsPrototype*>(vm, JSValue::decode(thisValue));
+    if (UNLIKELY(!prototype))
+        return throwVMTypeError(lexicalGlobalObject, throwScope);
+    return JSValue::encode(JSURLSearchParams::getConstructor(JSC::getVM(lexicalGlobalObject), prototype->globalObject()));
+}
+
+static inline JSC::EncodedJSValue jsURLSearchParamsPrototypeFunction_appendBody(JSC::JSGlobalObject* lexicalGlobalObject, JSC::CallFrame* callFrame, typename IDLOperation<JSURLSearchParams>::ClassParameter castedThis)
+{
+    auto& vm = JSC::getVM(lexicalGlobalObject);
+    auto throwScope = DECLARE_THROW_SCOPE(vm);
+    UNUSED_PARAM(throwScope);
+    UNUSED_PARAM(callFrame);
+    auto& impl = castedThis->wrapped();
+    if (UNLIKELY(callFrame->argumentCount() < 2))
+        return throwVMError(lexicalGlobalObject, throwScope, createNotEnoughArgumentsError(lexicalGlobalObject));
+    EnsureStillAliveScope argument0 = callFrame->uncheckedArgument(0);
+    auto name = convert<IDLUSVString>(*lexicalGlobalObject, argument0.value());
+    RETURN_IF_EXCEPTION(throwScope, encodedJSValue());
+    EnsureStillAliveScope argument1 = callFrame->uncheckedArgument(1);
+    auto value = convert<IDLUSVString>(*lexicalGlobalObject, argument1.value());
+    RETURN_IF_EXCEPTION(throwScope, encodedJSValue());
+    RELEASE_AND_RETURN(throwScope, JSValue::encode(toJS<IDLUndefined>(*lexicalGlobalObject, throwScope, [&]() -> decltype(auto) { return impl.append(WTFMove(name), WTFMove(value)); })));
+}
+
+JSC_DEFINE_HOST_FUNCTION(jsURLSearchParamsPrototypeFunction_append, (JSGlobalObject * lexicalGlobalObject, CallFrame* callFrame))
+{
+    return IDLOperation<JSURLSearchParams>::call<jsURLSearchParamsPrototypeFunction_appendBody>(*lexicalGlobalObject, *callFrame, "append");
+}
+
+static inline JSC::EncodedJSValue jsURLSearchParamsPrototypeFunction_deleteBody(JSC::JSGlobalObject* lexicalGlobalObject, JSC::CallFrame* callFrame, typename IDLOperation<JSURLSearchParams>::ClassParameter castedThis)
+{
+    auto& vm = JSC::getVM(lexicalGlobalObject);
+    auto throwScope = DECLARE_THROW_SCOPE(vm);
+    UNUSED_PARAM(throwScope);
+    UNUSED_PARAM(callFrame);
+    auto& impl = castedThis->wrapped();
+    if (UNLIKELY(callFrame->argumentCount() < 1))
+        return throwVMError(lexicalGlobalObject, throwScope, createNotEnoughArgumentsError(lexicalGlobalObject));
+    EnsureStillAliveScope argument0 = callFrame->uncheckedArgument(0);
+    auto name = convert<IDLUSVString>(*lexicalGlobalObject, argument0.value());
+    RETURN_IF_EXCEPTION(throwScope, encodedJSValue());
+    RELEASE_AND_RETURN(throwScope, JSValue::encode(toJS<IDLUndefined>(*lexicalGlobalObject, throwScope, [&]() -> decltype(auto) { return impl.remove(WTFMove(name)); })));
+}
+
+JSC_DEFINE_HOST_FUNCTION(jsURLSearchParamsPrototypeFunction_delete, (JSGlobalObject * lexicalGlobalObject, CallFrame* callFrame))
+{
+    return IDLOperation<JSURLSearchParams>::call<jsURLSearchParamsPrototypeFunction_deleteBody>(*lexicalGlobalObject, *callFrame, "delete");
+}
+
+static inline JSC::EncodedJSValue jsURLSearchParamsPrototypeFunction_getBody(JSC::JSGlobalObject* lexicalGlobalObject, JSC::CallFrame* callFrame, typename IDLOperation<JSURLSearchParams>::ClassParameter castedThis)
+{
+    auto& vm = JSC::getVM(lexicalGlobalObject);
+    auto throwScope = DECLARE_THROW_SCOPE(vm);
+    UNUSED_PARAM(throwScope);
+    UNUSED_PARAM(callFrame);
+    auto& impl = castedThis->wrapped();
+    if (UNLIKELY(callFrame->argumentCount() < 1))
+        return throwVMError(lexicalGlobalObject, throwScope, createNotEnoughArgumentsError(lexicalGlobalObject));
+    EnsureStillAliveScope argument0 = callFrame->uncheckedArgument(0);
+    auto name = convert<IDLUSVString>(*lexicalGlobalObject, argument0.value());
+    RETURN_IF_EXCEPTION(throwScope, encodedJSValue());
+    RELEASE_AND_RETURN(throwScope, JSValue::encode(toJS<IDLNullable<IDLUSVString>>(*lexicalGlobalObject, throwScope, impl.get(WTFMove(name)))));
+}
+
+JSC_DEFINE_HOST_FUNCTION(jsURLSearchParamsPrototypeFunction_get, (JSGlobalObject * lexicalGlobalObject, CallFrame* callFrame))
+{
+    return IDLOperation<JSURLSearchParams>::call<jsURLSearchParamsPrototypeFunction_getBody>(*lexicalGlobalObject, *callFrame, "get");
+}
+
+static inline JSC::EncodedJSValue jsURLSearchParamsPrototypeFunction_getAllBody(JSC::JSGlobalObject* lexicalGlobalObject, JSC::CallFrame* callFrame, typename IDLOperation<JSURLSearchParams>::ClassParameter castedThis)
+{
+    auto& vm = JSC::getVM(lexicalGlobalObject);
+    auto throwScope = DECLARE_THROW_SCOPE(vm);
+    UNUSED_PARAM(throwScope);
+    UNUSED_PARAM(callFrame);
+    auto& impl = castedThis->wrapped();
+    if (UNLIKELY(callFrame->argumentCount() < 1))
+        return throwVMError(lexicalGlobalObject, throwScope, createNotEnoughArgumentsError(lexicalGlobalObject));
+    EnsureStillAliveScope argument0 = callFrame->uncheckedArgument(0);
+    auto name = convert<IDLUSVString>(*lexicalGlobalObject, argument0.value());
+    RETURN_IF_EXCEPTION(throwScope, encodedJSValue());
+    RELEASE_AND_RETURN(throwScope, JSValue::encode(toJS<IDLSequence<IDLUSVString>>(*lexicalGlobalObject, *castedThis->globalObject(), throwScope, impl.getAll(WTFMove(name)))));
+}
+
+JSC_DEFINE_HOST_FUNCTION(jsURLSearchParamsPrototypeFunction_getAll, (JSGlobalObject * lexicalGlobalObject, CallFrame* callFrame))
+{
+    return IDLOperation<JSURLSearchParams>::call<jsURLSearchParamsPrototypeFunction_getAllBody>(*lexicalGlobalObject, *callFrame, "getAll");
+}
+
+static inline JSC::EncodedJSValue jsURLSearchParamsPrototypeFunction_hasBody(JSC::JSGlobalObject* lexicalGlobalObject, JSC::CallFrame* callFrame, typename IDLOperation<JSURLSearchParams>::ClassParameter castedThis)
+{
+    auto& vm = JSC::getVM(lexicalGlobalObject);
+    auto throwScope = DECLARE_THROW_SCOPE(vm);
+    UNUSED_PARAM(throwScope);
+    UNUSED_PARAM(callFrame);
+    auto& impl = castedThis->wrapped();
+    if (UNLIKELY(callFrame->argumentCount() < 1))
+        return throwVMError(lexicalGlobalObject, throwScope, createNotEnoughArgumentsError(lexicalGlobalObject));
+    EnsureStillAliveScope argument0 = callFrame->uncheckedArgument(0);
+    auto name = convert<IDLUSVString>(*lexicalGlobalObject, argument0.value());
+    RETURN_IF_EXCEPTION(throwScope, encodedJSValue());
+    RELEASE_AND_RETURN(throwScope, JSValue::encode(toJS<IDLBoolean>(*lexicalGlobalObject, throwScope, impl.has(WTFMove(name)))));
+}
+
+JSC_DEFINE_HOST_FUNCTION(jsURLSearchParamsPrototypeFunction_has, (JSGlobalObject * lexicalGlobalObject, CallFrame* callFrame))
+{
+    return IDLOperation<JSURLSearchParams>::call<jsURLSearchParamsPrototypeFunction_hasBody>(*lexicalGlobalObject, *callFrame, "has");
+}
+
+static inline JSC::EncodedJSValue jsURLSearchParamsPrototypeFunction_setBody(JSC::JSGlobalObject* lexicalGlobalObject, JSC::CallFrame* callFrame, typename IDLOperation<JSURLSearchParams>::ClassParameter castedThis)
+{
+    auto& vm = JSC::getVM(lexicalGlobalObject);
+    auto throwScope = DECLARE_THROW_SCOPE(vm);
+    UNUSED_PARAM(throwScope);
+    UNUSED_PARAM(callFrame);
+    auto& impl = castedThis->wrapped();
+    if (UNLIKELY(callFrame->argumentCount() < 2))
+        return throwVMError(lexicalGlobalObject, throwScope, createNotEnoughArgumentsError(lexicalGlobalObject));
+    EnsureStillAliveScope argument0 = callFrame->uncheckedArgument(0);
+    auto name = convert<IDLUSVString>(*lexicalGlobalObject, argument0.value());
+    RETURN_IF_EXCEPTION(throwScope, encodedJSValue());
+    EnsureStillAliveScope argument1 = callFrame->uncheckedArgument(1);
+    auto value = convert<IDLUSVString>(*lexicalGlobalObject, argument1.value());
+    RETURN_IF_EXCEPTION(throwScope, encodedJSValue());
+    RELEASE_AND_RETURN(throwScope, JSValue::encode(toJS<IDLUndefined>(*lexicalGlobalObject, throwScope, [&]() -> decltype(auto) { return impl.set(WTFMove(name), WTFMove(value)); })));
+}
+
+JSC_DEFINE_HOST_FUNCTION(jsURLSearchParamsPrototypeFunction_set, (JSGlobalObject * lexicalGlobalObject, CallFrame* callFrame))
+{
+    return IDLOperation<JSURLSearchParams>::call<jsURLSearchParamsPrototypeFunction_setBody>(*lexicalGlobalObject, *callFrame, "set");
+}
+
+static inline JSC::EncodedJSValue jsURLSearchParamsPrototypeFunction_sortBody(JSC::JSGlobalObject* lexicalGlobalObject, JSC::CallFrame* callFrame, typename IDLOperation<JSURLSearchParams>::ClassParameter castedThis)
+{
+    auto& vm = JSC::getVM(lexicalGlobalObject);
+    auto throwScope = DECLARE_THROW_SCOPE(vm);
+    UNUSED_PARAM(throwScope);
+    UNUSED_PARAM(callFrame);
+    auto& impl = castedThis->wrapped();
+    RELEASE_AND_RETURN(throwScope, JSValue::encode(toJS<IDLUndefined>(*lexicalGlobalObject, throwScope, [&]() -> decltype(auto) { return impl.sort(); })));
+}
+
+JSC_DEFINE_HOST_FUNCTION(jsURLSearchParamsPrototypeFunction_sort, (JSGlobalObject * lexicalGlobalObject, CallFrame* callFrame))
+{
+    return IDLOperation<JSURLSearchParams>::call<jsURLSearchParamsPrototypeFunction_sortBody>(*lexicalGlobalObject, *callFrame, "sort");
+}
+
+static inline JSC::EncodedJSValue jsURLSearchParamsPrototypeFunction_toStringBody(JSC::JSGlobalObject* lexicalGlobalObject, JSC::CallFrame* callFrame, typename IDLOperation<JSURLSearchParams>::ClassParameter castedThis)
+{
+    auto& vm = JSC::getVM(lexicalGlobalObject);
+    auto throwScope = DECLARE_THROW_SCOPE(vm);
+    UNUSED_PARAM(throwScope);
+    UNUSED_PARAM(callFrame);
+    auto& impl = castedThis->wrapped();
+    RELEASE_AND_RETURN(throwScope, JSValue::encode(toJS<IDLDOMString>(*lexicalGlobalObject, throwScope, impl.toString())));
+}
+
+JSC_DEFINE_HOST_FUNCTION(jsURLSearchParamsPrototypeFunction_toString, (JSGlobalObject * lexicalGlobalObject, CallFrame* callFrame))
+{
+    return IDLOperation<JSURLSearchParams>::call<jsURLSearchParamsPrototypeFunction_toStringBody>(*lexicalGlobalObject, *callFrame, "toString");
+}
+
+struct URLSearchParamsIteratorTraits {
+    static constexpr JSDOMIteratorType type = JSDOMIteratorType::Map;
+    using KeyType = IDLUSVString;
+    using ValueType = IDLUSVString;
+};
+
+using URLSearchParamsIteratorBase = JSDOMIteratorBase<JSURLSearchParams, URLSearchParamsIteratorTraits>;
+class URLSearchParamsIterator final : public URLSearchParamsIteratorBase {
+public:
+    using Base = URLSearchParamsIteratorBase;
+    DECLARE_INFO;
+
+    template<typename, SubspaceAccess mode> static JSC::GCClient::IsoSubspace* subspaceFor(JSC::VM& vm)
+    {
+        if constexpr (mode == JSC::SubspaceAccess::Concurrently)
+            return nullptr;
+        return WebCore::subspaceForImpl<URLSearchParamsIterator, UseCustomHeapCellType::No>(
+            vm,
+            [](auto& spaces) { return spaces.m_clientSubspaceForURLSearchParamsIterator.get(); },
+            [](auto& spaces, auto&& space) { spaces.m_clientSubspaceForURLSearchParamsIterator = WTFMove(space); },
+            [](auto& spaces) { return spaces.m_subspaceForURLSearchParamsIterator.get(); },
+            [](auto& spaces, auto&& space) { spaces.m_subspaceForURLSearchParamsIterator = WTFMove(space); });
+    }
+
+    static JSC::Structure* createStructure(JSC::VM& vm, JSC::JSGlobalObject* globalObject, JSC::JSValue prototype)
+    {
+        return JSC::Structure::create(vm, globalObject, prototype, JSC::TypeInfo(JSC::ObjectType, StructureFlags), info());
+    }
+
+    static URLSearchParamsIterator* create(JSC::VM& vm, JSC::Structure* structure, JSURLSearchParams& iteratedObject, IterationKind kind)
+    {
+        auto* instance = new (NotNull, JSC::allocateCell<URLSearchParamsIterator>(vm)) URLSearchParamsIterator(structure, iteratedObject, kind);
+        instance->finishCreation(vm);
+        return instance;
+    }
+
+private:
+    URLSearchParamsIterator(JSC::Structure* structure, JSURLSearchParams& iteratedObject, IterationKind kind)
+        : Base(structure, iteratedObject, kind)
+    {
+    }
+};
+
+using URLSearchParamsIteratorPrototype = JSDOMIteratorPrototype<JSURLSearchParams, URLSearchParamsIteratorTraits>;
+JSC_ANNOTATE_HOST_FUNCTION(URLSearchParamsIteratorPrototypeNext, URLSearchParamsIteratorPrototype::next);
+
+template<>
+const JSC::ClassInfo URLSearchParamsIteratorBase::s_info = { "URLSearchParams Iterator"_s, &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(URLSearchParamsIteratorBase) };
+const JSC::ClassInfo URLSearchParamsIterator::s_info = { "URLSearchParams Iterator"_s, &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(URLSearchParamsIterator) };
+
+template<>
+const JSC::ClassInfo URLSearchParamsIteratorPrototype::s_info = { "URLSearchParams Iterator"_s, &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(URLSearchParamsIteratorPrototype) };
+
+static inline EncodedJSValue jsURLSearchParamsPrototypeFunction_entriesCaller(JSGlobalObject*, CallFrame*, JSURLSearchParams* thisObject)
+{
+    return JSValue::encode(iteratorCreate<URLSearchParamsIterator>(*thisObject, IterationKind::Entries));
+}
+
+JSC_DEFINE_HOST_FUNCTION(jsURLSearchParamsPrototypeFunction_entries, (JSC::JSGlobalObject * lexicalGlobalObject, JSC::CallFrame* callFrame))
+{
+    return IDLOperation<JSURLSearchParams>::call<jsURLSearchParamsPrototypeFunction_entriesCaller>(*lexicalGlobalObject, *callFrame, "entries");
+}
+
+static inline EncodedJSValue jsURLSearchParamsPrototypeFunction_keysCaller(JSGlobalObject*, CallFrame*, JSURLSearchParams* thisObject)
+{
+    return JSValue::encode(iteratorCreate<URLSearchParamsIterator>(*thisObject, IterationKind::Keys));
+}
+
+JSC_DEFINE_HOST_FUNCTION(jsURLSearchParamsPrototypeFunction_keys, (JSC::JSGlobalObject * lexicalGlobalObject, JSC::CallFrame* callFrame))
+{
+    return IDLOperation<JSURLSearchParams>::call<jsURLSearchParamsPrototypeFunction_keysCaller>(*lexicalGlobalObject, *callFrame, "keys");
+}
+
+static inline EncodedJSValue jsURLSearchParamsPrototypeFunction_valuesCaller(JSGlobalObject*, CallFrame*, JSURLSearchParams* thisObject)
+{
+    return JSValue::encode(iteratorCreate<URLSearchParamsIterator>(*thisObject, IterationKind::Values));
+}
+
+JSC_DEFINE_HOST_FUNCTION(jsURLSearchParamsPrototypeFunction_values, (JSC::JSGlobalObject * lexicalGlobalObject, JSC::CallFrame* callFrame))
+{
+    return IDLOperation<JSURLSearchParams>::call<jsURLSearchParamsPrototypeFunction_valuesCaller>(*lexicalGlobalObject, *callFrame, "values");
+}
+
+static inline EncodedJSValue jsURLSearchParamsPrototypeFunction_forEachCaller(JSGlobalObject* lexicalGlobalObject, CallFrame* callFrame, JSURLSearchParams* thisObject)
+{
+    return JSValue::encode(iteratorForEach<URLSearchParamsIterator>(*lexicalGlobalObject, *callFrame, *thisObject));
+}
+
+JSC_DEFINE_HOST_FUNCTION(jsURLSearchParamsPrototypeFunction_forEach, (JSC::JSGlobalObject * lexicalGlobalObject, JSC::CallFrame* callFrame))
+{
+    return IDLOperation<JSURLSearchParams>::call<jsURLSearchParamsPrototypeFunction_forEachCaller>(*lexicalGlobalObject, *callFrame, "forEach");
+}
+
+JSC::GCClient::IsoSubspace* JSURLSearchParams::subspaceForImpl(JSC::VM& vm)
+{
+    return WebCore::subspaceForImpl<JSURLSearchParams, UseCustomHeapCellType::No>(
+        vm,
+        [](auto& spaces) { return spaces.m_clientSubspaceForURLSearchParams.get(); },
+        [](auto& spaces, auto&& space) { spaces.m_clientSubspaceForURLSearchParams = WTFMove(space); },
+        [](auto& spaces) { return spaces.m_subspaceForURLSearchParams.get(); },
+        [](auto& spaces, auto&& space) { spaces.m_subspaceForURLSearchParams = WTFMove(space); });
+}
+
+void JSURLSearchParams::analyzeHeap(JSCell* cell, HeapAnalyzer& analyzer)
+{
+    auto* thisObject = jsCast<JSURLSearchParams*>(cell);
+    analyzer.setWrappedObjectForCell(cell, &thisObject->wrapped());
+    // if (thisObject->scriptExecutionContext())
+    //     analyzer.setLabelForCell(cell, "url " + thisObject->scriptExecutionContext()->url().string());
+    Base::analyzeHeap(cell, analyzer);
+}
+
+bool JSURLSearchParamsOwner::isReachableFromOpaqueRoots(JSC::Handle<JSC::Unknown> handle, void*, AbstractSlotVisitor& visitor, const char** reason)
+{
+    UNUSED_PARAM(handle);
+    UNUSED_PARAM(visitor);
+    UNUSED_PARAM(reason);
+    return false;
+}
+
+void JSURLSearchParamsOwner::finalize(JSC::Handle<JSC::Unknown> handle, void* context)
+{
+    auto* jsURLSearchParams = static_cast<JSURLSearchParams*>(handle.slot()->asCell());
+    auto& world = *static_cast<DOMWrapperWorld*>(context);
+    uncacheWrapper(world, &jsURLSearchParams->wrapped(), jsURLSearchParams);
+}
+
+// #if ENABLE(BINDING_INTEGRITY)
+// #if PLATFORM(WIN)
+// #pragma warning(disable : 4483)
+// extern "C" {
+// extern void (*const __identifier("??_7URLSearchParams@WebCore@@6B@")[])();
+// }
+// #else
+// extern "C" {
+// extern void* _ZTVN7WebCore15URLSearchParamsE[];
+// }
+// #endif
+// #endif
+
+JSC::JSValue toJSNewlyCreated(JSC::JSGlobalObject*, JSDOMGlobalObject* globalObject, Ref<URLSearchParams>&& impl)
+{
+
+    //     if constexpr (std::is_polymorphic_v<URLSearchParams>) {
+    // #if ENABLE(BINDING_INTEGRITY)
+    //         const void* actualVTablePointer = getVTablePointer(impl.ptr());
+    // #if PLATFORM(WIN)
+    //         void* expectedVTablePointer = __identifier("??_7URLSearchParams@WebCore@@6B@");
+    // #else
+    //         void* expectedVTablePointer = &_ZTVN7WebCore15URLSearchParamsE[2];
+    // #endif
+
+    //         // If you hit this assertion you either have a use after free bug, or
+    //         // URLSearchParams has subclasses. If URLSearchParams has subclasses that get passed
+    //         // to toJS() we currently require URLSearchParams you to opt out of binding hardening
+    //         // by adding the SkipVTableValidation attribute to the interface IDL definition
+    //         RELEASE_ASSERT(actualVTablePointer == expectedVTablePointer);
+    // #endif
+    // }
+    return createWrapper<URLSearchParams>(globalObject, WTFMove(impl));
+}
+
+JSC::JSValue toJS(JSC::JSGlobalObject* lexicalGlobalObject, JSDOMGlobalObject* globalObject, URLSearchParams& impl)
+{
+    return wrap(lexicalGlobalObject, globalObject, impl);
+}
+
+URLSearchParams* JSURLSearchParams::toWrapped(JSC::VM& vm, JSC::JSValue value)
+{
+    if (auto* wrapper = jsDynamicCast<JSURLSearchParams*>(vm, value))
+        return &wrapper->wrapped();
+    return nullptr;
+}
+
+}
diff --git a/src/javascript/jsc/bindings/webcore/JSURLSearchParams.dep b/src/javascript/jsc/bindings/webcore/JSURLSearchParams.dep
new file mode 100644
index 000000000..73a94dc7b
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/JSURLSearchParams.dep
@@ -0,0 +1 @@
+JSURLSearchParams.h : 
diff --git a/src/javascript/jsc/bindings/webcore/JSURLSearchParams.h b/src/javascript/jsc/bindings/webcore/JSURLSearchParams.h
new file mode 100644
index 000000000..b7e90a3fb
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/JSURLSearchParams.h
@@ -0,0 +1,94 @@
+/*
+    This file is part of the WebKit open source project.
+    This file has been generated by generate-bindings.pl. DO NOT MODIFY!
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Library General Public
+    License as published by the Free Software Foundation; either
+    version 2 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Library General Public License for more details.
+
+    You should have received a copy of the GNU Library General Public License
+    along with this library; see the file COPYING.LIB.  If not, write to
+    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+    Boston, MA 02110-1301, USA.
+*/
+
+#pragma once
+
+#include "JSDOMWrapper.h"
+#include "URLSearchParams.h"
+#include "wtf/NeverDestroyed.h"
+
+namespace WebCore {
+
+class JSURLSearchParams : public JSDOMWrapper<URLSearchParams> {
+public:
+    using Base = JSDOMWrapper<URLSearchParams>;
+    static JSURLSearchParams* create(JSC::Structure* structure, JSDOMGlobalObject* globalObject, Ref<URLSearchParams>&& impl)
+    {
+        JSURLSearchParams* ptr = new (NotNull, JSC::allocateCell<JSURLSearchParams>(globalObject->vm())) JSURLSearchParams(structure, *globalObject, WTFMove(impl));
+        ptr->finishCreation(globalObject->vm());
+        return ptr;
+    }
+
+    static JSC::JSObject* createPrototype(JSC::VM&, JSDOMGlobalObject&);
+    static JSC::JSObject* prototype(JSC::VM&, JSDOMGlobalObject&);
+    static URLSearchParams* toWrapped(JSC::VM&, JSC::JSValue);
+    static void destroy(JSC::JSCell*);
+
+    DECLARE_INFO;
+
+    static JSC::Structure* createStructure(JSC::VM& vm, JSC::JSGlobalObject* globalObject, JSC::JSValue prototype)
+    {
+        return JSC::Structure::create(vm, globalObject, prototype, JSC::TypeInfo(JSC::ObjectType, StructureFlags), info(), JSC::NonArray);
+    }
+
+    static JSC::JSValue getConstructor(JSC::VM&, const JSC::JSGlobalObject*);
+    template<typename, JSC::SubspaceAccess mode> static JSC::GCClient::IsoSubspace* subspaceFor(JSC::VM& vm)
+    {
+        if constexpr (mode == JSC::SubspaceAccess::Concurrently)
+            return nullptr;
+        return subspaceForImpl(vm);
+    }
+    static JSC::GCClient::IsoSubspace* subspaceForImpl(JSC::VM& vm);
+    static void analyzeHeap(JSCell*, JSC::HeapAnalyzer&);
+
+protected:
+    JSURLSearchParams(JSC::Structure*, JSDOMGlobalObject&, Ref<URLSearchParams>&&);
+
+    void finishCreation(JSC::VM&);
+};
+
+class JSURLSearchParamsOwner final : public JSC::WeakHandleOwner {
+public:
+    bool isReachableFromOpaqueRoots(JSC::Handle<JSC::Unknown>, void* context, JSC::AbstractSlotVisitor&, const char**) final;
+    void finalize(JSC::Handle<JSC::Unknown>, void* context) final;
+};
+
+inline JSC::WeakHandleOwner* wrapperOwner(DOMWrapperWorld&, URLSearchParams*)
+{
+    static NeverDestroyed<JSURLSearchParamsOwner> owner;
+    return &owner.get();
+}
+
+inline void* wrapperKey(URLSearchParams* wrappableObject)
+{
+    return wrappableObject;
+}
+
+JSC::JSValue toJS(JSC::JSGlobalObject*, JSDOMGlobalObject*, URLSearchParams&);
+inline JSC::JSValue toJS(JSC::JSGlobalObject* lexicalGlobalObject, JSDOMGlobalObject* globalObject, URLSearchParams* impl) { return impl ? toJS(lexicalGlobalObject, globalObject, *impl) : JSC::jsNull(); }
+JSC::JSValue toJSNewlyCreated(JSC::JSGlobalObject*, JSDOMGlobalObject*, Ref<URLSearchParams>&&);
+inline JSC::JSValue toJSNewlyCreated(JSC::JSGlobalObject* lexicalGlobalObject, JSDOMGlobalObject* globalObject, RefPtr<URLSearchParams>&& impl) { return impl ? toJSNewlyCreated(lexicalGlobalObject, globalObject, impl.releaseNonNull()) : JSC::jsNull(); }
+
+template<> struct JSDOMWrapperConverterTraits<URLSearchParams> {
+    using WrapperClass = JSURLSearchParams;
+    using ToWrappedReturnType = URLSearchParams*;
+};
+
+} // namespace WebCore
diff --git a/src/javascript/jsc/bindings/webcore/JSValueInWrappedObject.h b/src/javascript/jsc/bindings/webcore/JSValueInWrappedObject.h
new file mode 100644
index 000000000..d05fdb8fd
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/JSValueInWrappedObject.h
@@ -0,0 +1,135 @@
+/*
+ * Copyright (C) 2018-2021 Apple Inc. All rights reserved.
+
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1.  Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ * 2.  Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "DOMWrapperWorld.h"
+#include "JSDOMWrapper.h"
+#include "JavaScriptCore/JSCJSValue.h"
+#include "JavaScriptCore/SlotVisitor.h"
+#include "JavaScriptCore/Weak.h"
+#include <variant>
+
+namespace WebCore {
+
+// This class includes a lot of GC related subtle things, and changing this class easily causes GC crashes.
+// Any changes on this class must be reviewed by JavaScriptCore reviewers too.
+class JSValueInWrappedObject {
+    // It must be neither copyable nor movable. Changing this will break concurrent GC.
+    WTF_MAKE_NONCOPYABLE(JSValueInWrappedObject);
+    WTF_MAKE_NONMOVABLE(JSValueInWrappedObject);
+
+public:
+    JSValueInWrappedObject(JSC::JSValue = {});
+
+    explicit operator bool() const;
+    template<typename Visitor> void visit(Visitor&) const;
+    void clear();
+
+    void set(JSC::VM&, const JSC::JSCell* owner, JSC::JSValue);
+    void setWeakly(JSC::JSValue);
+    JSC::JSValue getValue(JSC::JSValue nullValue = JSC::jsUndefined()) const;
+
+    // FIXME: Remove this once IDBRequest semantic bug is fixed.
+    // https://bugs.webkit.org/show_bug.cgi?id=236278
+    void setWithoutBarrier(JSValueInWrappedObject&);
+
+private:
+    // Keep in mind that all of these fields are accessed concurrently without lock from concurrent GC thread.
+    JSC::JSValue m_nonCell {};
+    JSC::Weak<JSC::JSCell> m_cell {};
+};
+
+JSC::JSValue cachedPropertyValue(JSC::JSGlobalObject&, const JSDOMObject& owner, JSValueInWrappedObject& cacheSlot, const Function<JSC::JSValue()>&);
+
+inline JSValueInWrappedObject::JSValueInWrappedObject(JSC::JSValue value)
+{
+    setWeakly(value);
+}
+
+inline JSC::JSValue JSValueInWrappedObject::getValue(JSC::JSValue nullValue) const
+{
+    if (m_nonCell)
+        return m_nonCell;
+    return m_cell ? m_cell.get() : nullValue;
+}
+
+inline JSValueInWrappedObject::operator bool() const
+{
+    return m_nonCell || m_cell;
+}
+
+template<typename Visitor>
+inline void JSValueInWrappedObject::visit(Visitor& visitor) const
+{
+    visitor.append(m_cell);
+}
+
+template void JSValueInWrappedObject::visit(JSC::AbstractSlotVisitor&) const;
+template void JSValueInWrappedObject::visit(JSC::SlotVisitor&) const;
+
+inline void JSValueInWrappedObject::setWeakly(JSC::JSValue value)
+{
+    if (!value.isCell()) {
+        m_nonCell = value;
+        m_cell.clear();
+        return;
+    }
+    m_nonCell = {};
+    JSC::Weak weak { value.asCell() };
+    WTF::storeStoreFence();
+    m_cell = WTFMove(weak);
+}
+
+inline void JSValueInWrappedObject::set(JSC::VM& vm, const JSC::JSCell* owner, JSC::JSValue value)
+{
+    setWeakly(value);
+    vm.writeBarrier(owner, value);
+}
+
+inline void JSValueInWrappedObject::clear()
+{
+    m_nonCell = {};
+    m_cell.clear();
+}
+
+inline void JSValueInWrappedObject::setWithoutBarrier(JSValueInWrappedObject& other)
+{
+    JSC::Weak weak { other.m_cell.get() };
+    WTF::storeStoreFence(); // Ensure Weak is fully initialized for concurrent access.
+    m_nonCell = other.m_nonCell;
+    m_cell = WTFMove(weak);
+}
+
+inline JSC::JSValue cachedPropertyValue(JSC::JSGlobalObject& lexicalGlobalObject, const JSDOMObject& owner, JSValueInWrappedObject& cachedValue, const Function<JSC::JSValue()>& function)
+{
+    if (cachedValue && isWorldCompatible(lexicalGlobalObject, cachedValue.getValue()))
+        return cachedValue.getValue();
+    auto value = function();
+    cachedValue.set(lexicalGlobalObject.vm(), &owner, cloneAcrossWorlds(lexicalGlobalObject, owner, value));
+    ASSERT(isWorldCompatible(lexicalGlobalObject, cachedValue.getValue()));
+    return cachedValue.getValue();
+}
+
+} // namespace WebCore
diff --git a/src/javascript/jsc/bindings/webcore/ScriptWrappable.cpp b/src/javascript/jsc/bindings/webcore/ScriptWrappable.cpp
new file mode 100644
index 000000000..c55b2ac92
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/ScriptWrappable.cpp
@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2019 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1.  Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ * 2.  Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ * 3.  Neither the name of Apple Inc. ("Apple") nor the names of
+ *     its contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "ScriptWrappable.h"
+
+// #include "wtf/IsoMallocInlines.h"
+
+namespace WebCore {
+
+// WTF_MAKE_FAST_ALLOCATED
+
+} // namespace WebCore
diff --git a/src/javascript/jsc/bindings/webcore/ScriptWrappable.h b/src/javascript/jsc/bindings/webcore/ScriptWrappable.h
new file mode 100644
index 000000000..5d5f609d6
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/ScriptWrappable.h
@@ -0,0 +1,63 @@
+/*
+ * Copyright (C) 2013 Apple Inc. All rights reserved.
+ * Copyright (c) 2010, Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "JavaScriptCore/Weak.h"
+// #include "wtf/IsoMalloc.h"
+
+namespace JSC {
+class WeakHandleOwner;
+}
+
+namespace WebCore {
+
+class JSDOMObject;
+
+class ScriptWrappable {
+    WTF_MAKE_FAST_ALLOCATED;
+
+public:
+    JSDOMObject* wrapper() const;
+    void setWrapper(JSDOMObject*, JSC::WeakHandleOwner*, void*);
+    void clearWrapper(JSDOMObject*);
+
+    template<typename Derived>
+    static ptrdiff_t offsetOfWrapper() { return CAST_OFFSET(Derived*, ScriptWrappable*) + OBJECT_OFFSETOF(ScriptWrappable, m_wrapper); }
+
+protected:
+    ~ScriptWrappable() = default;
+
+private:
+    JSC::Weak<JSDOMObject> m_wrapper;
+};
+
+} // namespace WebCore
diff --git a/src/javascript/jsc/bindings/webcore/ScriptWrappableInlines.h b/src/javascript/jsc/bindings/webcore/ScriptWrappableInlines.h
new file mode 100644
index 000000000..80b8087bf
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/ScriptWrappableInlines.h
@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2013 Apple Inc. All rights reserved.
+ * Copyright (c) 2010, Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "JSDOMWrapper.h"
+#include "JavaScriptCore/Weak.h"
+#include "JavaScriptCore/WeakInlines.h"
+
+namespace WebCore {
+
+inline JSDOMObject* ScriptWrappable::wrapper() const
+{
+    return m_wrapper.get();
+}
+
+inline void ScriptWrappable::setWrapper(JSDOMObject* wrapper, JSC::WeakHandleOwner* wrapperOwner, void* context)
+{
+    ASSERT(!m_wrapper);
+    m_wrapper = JSC::Weak<JSDOMObject>(wrapper, wrapperOwner, context);
+}
+
+inline void ScriptWrappable::clearWrapper(JSDOMObject* wrapper)
+{
+    weakClear(m_wrapper, wrapper);
+}
+
+} // namespace WebCore
diff --git a/src/javascript/jsc/bindings/webcore/WebCoreJSClientData.h b/src/javascript/jsc/bindings/webcore/WebCoreJSClientData.h
new file mode 100644
index 000000000..68ada7e35
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/WebCoreJSClientData.h
@@ -0,0 +1 @@
+#include "BunClientData.h"
\ No newline at end of file
diff --git a/src/javascript/jsc/bindings/webcore/WebCoreTypedArrayController.cpp b/src/javascript/jsc/bindings/webcore/WebCoreTypedArrayController.cpp
new file mode 100644
index 000000000..9b68adc9a
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/WebCoreTypedArrayController.cpp
@@ -0,0 +1,78 @@
+/*
+ * Copyright (C) 2013-2021 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "root.h"
+
+#include "JavaScriptCore/JSCInlines.h"
+
+#include "WebCoreTypedArrayController.h"
+
+#include "JSDOMConvertBufferSource.h"
+
+#include "JSDOMGlobalObject.h"
+
+#include "JavaScriptCore/ArrayBuffer.h"
+
+#include "JavaScriptCore/JSArrayBuffer.h"
+
+namespace WebCore {
+
+WebCoreTypedArrayController::WebCoreTypedArrayController(bool allowAtomicsWait)
+    : m_allowAtomicsWait(allowAtomicsWait)
+{
+}
+
+WebCoreTypedArrayController::~WebCoreTypedArrayController() = default;
+
+JSC::JSArrayBuffer* WebCoreTypedArrayController::toJS(JSC::JSGlobalObject* lexicalGlobalObject, JSC::JSGlobalObject* globalObject, JSC::ArrayBuffer* buffer)
+{
+    return JSC::jsCast<JSC::JSArrayBuffer*>(WebCore::toJS(lexicalGlobalObject, JSC::jsCast<JSDOMGlobalObject*>(globalObject), buffer));
+}
+
+void WebCoreTypedArrayController::registerWrapper(JSC::JSGlobalObject* globalObject, JSC::ArrayBuffer* native, JSC::JSArrayBuffer* wrapper)
+{
+    cacheWrapper(JSC::jsCast<JSDOMGlobalObject*>(globalObject)->world(), native, wrapper);
+}
+
+bool WebCoreTypedArrayController::isAtomicsWaitAllowedOnCurrentThread()
+{
+    return m_allowAtomicsWait;
+}
+
+bool WebCoreTypedArrayController::JSArrayBufferOwner::isReachableFromOpaqueRoots(JSC::Handle<JSC::Unknown> handle, void*, JSC::AbstractSlotVisitor& visitor, const char** reason)
+{
+    if (UNLIKELY(reason))
+        *reason = "ArrayBuffer is opaque root";
+    auto& wrapper = *JSC::jsCast<JSC::JSArrayBuffer*>(handle.slot()->asCell());
+    return visitor.containsOpaqueRoot(wrapper.impl());
+}
+
+void WebCoreTypedArrayController::JSArrayBufferOwner::finalize(JSC::Handle<JSC::Unknown> handle, void* context)
+{
+    auto& wrapper = *static_cast<JSC::JSArrayBuffer*>(handle.slot()->asCell());
+    uncacheWrapper(*static_cast<DOMWrapperWorld*>(context), wrapper.impl(), &wrapper);
+}
+
+} // namespace WebCore
diff --git a/src/javascript/jsc/bindings/webcore/WebCoreTypedArrayController.h b/src/javascript/jsc/bindings/webcore/WebCoreTypedArrayController.h
new file mode 100644
index 000000000..437fb7d16
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/WebCoreTypedArrayController.h
@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2013-2021 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "JavaScriptCore/JSGlobalObject.h"
+#include "JavaScriptCore/TypedArrayController.h"
+
+namespace JSC {
+class WeakHandleOwner;
+}
+
+namespace WebCore {
+
+class WebCoreTypedArrayController : public JSC::TypedArrayController {
+public:
+    WebCoreTypedArrayController(bool allowAtomicsWait);
+    virtual ~WebCoreTypedArrayController();
+
+    JSC::JSArrayBuffer* toJS(JSC::JSGlobalObject*, JSC::JSGlobalObject*, JSC::ArrayBuffer*) override;
+    void registerWrapper(JSC::JSGlobalObject*, ArrayBuffer*, JSC::JSArrayBuffer*) override;
+    bool isAtomicsWaitAllowedOnCurrentThread() override;
+
+    JSC::WeakHandleOwner* wrapperOwner() { return &m_owner; }
+
+private:
+    class JSArrayBufferOwner : public JSC::WeakHandleOwner {
+    public:
+        bool isReachableFromOpaqueRoots(JSC::Handle<JSC::Unknown>, void* context, JSC::AbstractSlotVisitor&, const char**) override;
+        void finalize(JSC::Handle<JSC::Unknown>, void* context) override;
+    };
+
+    JSArrayBufferOwner m_owner;
+    bool m_allowAtomicsWait;
+};
+
+} // namespace WebCore
\ No newline at end of file
diff --git a/src/javascript/jsc/bindings/webcore/config.h b/src/javascript/jsc/bindings/webcore/config.h
new file mode 100644
index 000000000..a9f9f5d29
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/config.h
@@ -0,0 +1 @@
+#include "root.h"
\ No newline at end of file
diff --git a/src/javascript/jsc/bindings/webcore/weak_handle.cpp b/src/javascript/jsc/bindings/webcore/weak_handle.cpp
new file mode 100644
index 000000000..f10ae654d
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/weak_handle.cpp
@@ -0,0 +1,22 @@
+#include "config.h"
+#include "JavaScriptCore/WeakHandleOwner.h"
+
+namespace JSC {
+
+class SlotVisitor;
+template<typename T> class Handle;
+
+WeakHandleOwner::~WeakHandleOwner()
+{
+}
+
+bool WeakHandleOwner::isReachableFromOpaqueRoots(Handle<Unknown>, void*, AbstractSlotVisitor&, const char**)
+{
+    return false;
+}
+
+void WeakHandleOwner::finalize(Handle<Unknown>, void*)
+{
+}
+
+} // namespace JSC