1 files changed, 458 insertions, 0 deletions
diff --git a/src/bun.js/bindings/JSSink.cpp b/src/bun.js/bindings/JSSink.cpp
new file mode 100644
index 000000000..3c0d03174
--- /dev/null
+++ b/src/bun.js/bindings/JSSink.cpp
@@ -0,0 +1,458 @@
+
+// AUTO-GENERATED FILE. DO NOT EDIT.
+// Generated by /Users/jarred/Code/bun/src/bun.js/generate-jssink.js at 2022-06-15T10:28:21.211Z
+// To regenerate this file, run:
+//
+//  bun src/bun.js/generate-jssink.js
+//
+#include "root.h"
+#include "JSSink.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 "JSDOMWrapperCache.h"
+#include "ScriptExecutionContext.h"
+#include "WebCoreJSClientData.h"
+#include "JavaScriptCore/FunctionPrototype.h"
+#include "JavaScriptCore/HeapAnalyzer.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"
+#include "JavaScriptCore/BuiltinNames.h"
+
+#include "JSBufferEncodingType.h"
+#include "JSBufferPrototypeBuiltins.h"
+#include "JSBufferConstructorBuiltins.h"
+#include "JavaScriptCore/JSBase.h"
+#if ENABLE(MEDIA_SOURCE)
+#include "BufferMediaSource.h"
+#include "JSMediaSource.h"
+#endif
+
+// #include "JavaScriptCore/JSTypedArrayViewPrototype.h"
+#include "JavaScriptCore/JSArrayBufferViewInlines.h"
+
+#include "JSReadableStream.h"
+#include "BunClientData.h"
+#include "JavaScriptCore/Weak.h"
+#include "JavaScriptCore/WeakInlines.h"
+
+namespace WebCore {
+using namespace JSC;
+
+JSC_DEFINE_HOST_FUNCTION(functionStartDirectStream, (JSC::JSGlobalObject * lexicalGlobalObject, JSC::CallFrame* callFrame))
+{
+
+    auto& vm = lexicalGlobalObject->vm();
+    auto scope = DECLARE_THROW_SCOPE(vm);
+    Zig::GlobalObject* globalObject = reinterpret_cast<Zig::GlobalObject*>(lexicalGlobalObject);
+
+    JSC::JSValue readableStream = callFrame->argument(0);
+    JSC::JSValue onPull = callFrame->argument(1);
+    JSC::JSValue onClose = callFrame->argument(2);
+    if (!readableStream.isObject()) {
+        scope.throwException(globalObject, JSC::createTypeError(globalObject, "Expected ReadableStream"_s));
+        return JSC::JSValue::encode(JSC::jsUndefined());
+    }
+
+    if (!onPull.isObject() || !onPull.isCallable()) {
+        onPull = JSC::jsUndefined();
+    }
+
+    if (!onClose.isObject() || !onClose.isCallable()) {
+        onClose = JSC::jsUndefined();
+    }
+
+    JSC::JSFunction* onPullFunction = JSC::jsDynamicCast<JSC::JSFunction*>(onPull);
+    JSC::JSFunction* onCloseFunction = JSC::jsDynamicCast<JSC::JSFunction*>(onClose);
+
+    if (WebCore::JSReadableArrayBufferSinkController* ArrayBufferSinkController = JSC::jsDynamicCast<WebCore::JSReadableArrayBufferSinkController*>(callFrame->thisValue())) {
+        if (ArrayBufferSinkController->wrapped() == nullptr) {
+            scope.throwException(globalObject, JSC::createTypeError(globalObject, "Controller is already closed"_s));
+            return JSC::JSValue::encode(JSC::jsUndefined());
+        }
+
+        ArrayBufferSinkController->start(globalObject, readableStream, onPullFunction, onCloseFunction);
+    }
+
+    else {
+        scope.throwException(globalObject, JSC::createTypeError(globalObject, "Unknown direct controller. This is a bug in Bun."_s));
+        return JSC::JSValue::encode(JSC::jsUndefined());
+    }
+
+    RELEASE_AND_RETURN(scope, JSC::JSValue::encode(JSC::jsUndefined()));
+}
+
+JSC_DEFINE_CUSTOM_GETTER(functionArrayBufferSink__getter, (JSC::JSGlobalObject * lexicalGlobalObject, JSC::EncodedJSValue thisValue, JSC::PropertyName))
+{
+    auto& vm = lexicalGlobalObject->vm();
+    Zig::GlobalObject* globalObject = reinterpret_cast<Zig::GlobalObject*>(lexicalGlobalObject);
+
+    return JSC::JSValue::encode(globalObject->ArrayBufferSink());
+}
+
+JSC_DECLARE_HOST_FUNCTION(JSReadableArrayBufferSinkController__close);
+JSC_DEFINE_HOST_FUNCTION(JSReadableArrayBufferSinkController__close, (JSC::JSGlobalObject * lexicalGlobalObject, JSC::CallFrame* callFrame))
+{
+
+    auto& vm = lexicalGlobalObject->vm();
+    auto scope = DECLARE_THROW_SCOPE(vm);
+    Zig::GlobalObject* globalObject = reinterpret_cast<Zig::GlobalObject*>(lexicalGlobalObject);
+    WebCore::JSReadableArrayBufferSinkController* controller = JSC::jsDynamicCast<WebCore::JSReadableArrayBufferSinkController*>(callFrame->thisValue());
+    if (!controller) {
+        scope.throwException(globalObject, JSC::createTypeError(globalObject, "Expected JSReadableArrayBufferSinkController"_s));
+        return JSC::JSValue::encode(JSC::jsUndefined());
+    }
+
+    void* ptr = controller->wrapped();
+    if (ptr == nullptr) {
+        scope.throwException(globalObject, JSC::createTypeError(globalObject, "Controller is already closed"_s));
+        return JSC::JSValue::encode(JSC::jsUndefined());
+    }
+
+    controller->detach();
+    ArrayBufferSink__close(lexicalGlobalObject, ptr);
+    return JSC::JSValue::encode(JSC::jsUndefined());
+}
+
+JSC_DECLARE_HOST_FUNCTION(ArrayBufferSink__doClose);
+JSC_DEFINE_HOST_FUNCTION(ArrayBufferSink__doClose, (JSC::JSGlobalObject * lexicalGlobalObject, JSC::CallFrame* callFrame))
+{
+
+    auto& vm = lexicalGlobalObject->vm();
+    auto scope = DECLARE_THROW_SCOPE(vm);
+    Zig::GlobalObject* globalObject = reinterpret_cast<Zig::GlobalObject*>(lexicalGlobalObject);
+    WebCore::JSArrayBufferSink* sink = JSC::jsDynamicCast<WebCore::JSArrayBufferSink*>(callFrame->thisValue());
+    if (!sink) {
+        scope.throwException(globalObject, JSC::createTypeError(globalObject, "Expected ArrayBufferSink"_s));
+        return JSC::JSValue::encode(JSC::jsUndefined());
+    }
+
+    void* ptr = sink->wrapped();
+    if (ptr == nullptr) {
+        scope.throwException(globalObject, JSC::createTypeError(globalObject, "Controller is already closed"_s));
+        return JSC::JSValue::encode(JSC::jsUndefined());
+    }
+
+    sink->detach();
+    ArrayBufferSink__close(lexicalGlobalObject, ptr);
+    return JSC::JSValue::encode(JSC::jsUndefined());
+}
+
+static const HashTableValue JSArrayBufferSinkPrototypeTableValues[]
+    = {
+          { "close"_s, static_cast<unsigned>(JSC::PropertyAttribute::Function), NoIntrinsic, { (intptr_t) static_cast<RawNativeFunction>(ArrayBufferSink__doClose), (intptr_t)(0) } },
+          { "drain"_s, static_cast<unsigned>(JSC::PropertyAttribute::Function), NoIntrinsic, { (intptr_t) static_cast<RawNativeFunction>(ArrayBufferSink__drain), (intptr_t)(1) } },
+          { "end"_s, static_cast<unsigned>(JSC::PropertyAttribute::Function), NoIntrinsic, { (intptr_t) static_cast<RawNativeFunction>(ArrayBufferSink__end), (intptr_t)(0) } },
+          { "start"_s, static_cast<unsigned>(JSC::PropertyAttribute::Function), NoIntrinsic, { (intptr_t) static_cast<RawNativeFunction>(ArrayBufferSink__start), (intptr_t)(1) } },
+          { "write"_s, static_cast<unsigned>(JSC::PropertyAttribute::Function), NoIntrinsic, { (intptr_t) static_cast<RawNativeFunction>(ArrayBufferSink__write), (intptr_t)(1) } },
+      };
+
+static const HashTableValue JSReadableArrayBufferSinkControllerPrototypeTableValues[]
+    = {
+          { "close"_s, static_cast<unsigned>(JSC::PropertyAttribute::Function), NoIntrinsic, { (intptr_t) static_cast<RawNativeFunction>(JSReadableArrayBufferSinkController__close), (intptr_t)(0) } },
+          { "drain"_s, static_cast<unsigned>(JSC::PropertyAttribute::Function), NoIntrinsic, { (intptr_t) static_cast<RawNativeFunction>(ArrayBufferSink__drain), (intptr_t)(1) } },
+          { "end"_s, static_cast<unsigned>(JSC::PropertyAttribute::Function), NoIntrinsic, { (intptr_t) static_cast<RawNativeFunction>(ArrayBufferSink__end), (intptr_t)(0) } },
+          { "start"_s, static_cast<unsigned>(JSC::PropertyAttribute::Function), NoIntrinsic, { (intptr_t) static_cast<RawNativeFunction>(ArrayBufferSink__start), (intptr_t)(1) } },
+          { "write"_s, static_cast<unsigned>(JSC::PropertyAttribute::Function), NoIntrinsic, { (intptr_t) static_cast<RawNativeFunction>(ArrayBufferSink__write), (intptr_t)(1) } },
+      };
+
+#pragma mark - ArrayBufferSink
+
+class JSArrayBufferSinkPrototype final : public JSC::JSNonFinalObject {
+public:
+    using Base = JSC::JSNonFinalObject;
+
+    static JSArrayBufferSinkPrototype* create(JSC::VM& vm, JSGlobalObject* globalObject, JSC::Structure* structure)
+    {
+        JSArrayBufferSinkPrototype* ptr = new (NotNull, JSC::allocateCell<JSArrayBufferSinkPrototype>(vm)) JSArrayBufferSinkPrototype(vm, globalObject, structure);
+        ptr->finishCreation(vm, globalObject);
+        return ptr;
+    }
+
+    DECLARE_INFO;
+    template<typename CellType, JSC::SubspaceAccess>
+    static JSC::GCClient::IsoSubspace* subspaceFor(JSC::VM& vm)
+    {
+        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:
+    JSArrayBufferSinkPrototype(JSC::VM& vm, JSC::JSGlobalObject* globalObject, JSC::Structure* structure)
+        : Base(vm, structure)
+    {
+    }
+
+    void finishCreation(JSC::VM&, JSC::JSGlobalObject*);
+};
+STATIC_ASSERT_ISO_SUBSPACE_SHARABLE(JSArrayBufferSinkPrototype, JSArrayBufferSinkPrototype::Base);
+
+class JSReadableArrayBufferSinkControllerPrototype final : public JSC::JSNonFinalObject {
+public:
+    using Base = JSC::JSNonFinalObject;
+
+    static JSReadableArrayBufferSinkControllerPrototype* create(JSC::VM& vm, JSGlobalObject* globalObject, JSC::Structure* structure)
+    {
+        JSReadableArrayBufferSinkControllerPrototype* ptr = new (NotNull, JSC::allocateCell<JSReadableArrayBufferSinkControllerPrototype>(vm)) JSReadableArrayBufferSinkControllerPrototype(vm, globalObject, structure);
+        ptr->finishCreation(vm, globalObject);
+        return ptr;
+    }
+
+    DECLARE_INFO;
+    template<typename CellType, JSC::SubspaceAccess>
+    static JSC::GCClient::IsoSubspace* subspaceFor(JSC::VM& vm)
+    {
+        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:
+    JSReadableArrayBufferSinkControllerPrototype(JSC::VM& vm, JSC::JSGlobalObject* globalObject, JSC::Structure* structure)
+        : Base(vm, structure)
+    {
+    }
+
+    void finishCreation(JSC::VM&, JSC::JSGlobalObject*);
+};
+STATIC_ASSERT_ISO_SUBSPACE_SHARABLE(JSReadableArrayBufferSinkControllerPrototype, JSReadableArrayBufferSinkControllerPrototype::Base);
+
+const ClassInfo JSArrayBufferSinkPrototype::s_info = { "ArrayBufferSink"_s, &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(JSArrayBufferSinkPrototype) };
+const ClassInfo JSArrayBufferSink::s_info = { "ArrayBufferSink"_s, &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(JSArrayBufferSink) };
+const ClassInfo JSArrayBufferSinkConstructor::s_info = { "ArrayBufferSink"_s, &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(JSArrayBufferSinkConstructor) };
+
+const ClassInfo JSReadableArrayBufferSinkControllerPrototype::s_info = { "ReadableArrayBufferSinkController"_s, &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(JSReadableArrayBufferSinkControllerPrototype) };
+const ClassInfo JSReadableArrayBufferSinkController::s_info = { "ReadableArrayBufferSinkController"_s, &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(JSReadableArrayBufferSinkController) };
+
+JSArrayBufferSink::~JSArrayBufferSink()
+{
+    if (m_sinkPtr) {
+        ArrayBufferSink__finalize(m_sinkPtr);
+    }
+}
+
+JSReadableArrayBufferSinkController::~JSReadableArrayBufferSinkController()
+{
+    if (m_sinkPtr) {
+        ArrayBufferSink__finalize(m_sinkPtr);
+    }
+}
+
+JSArrayBufferSinkConstructor* JSArrayBufferSinkConstructor::create(JSC::VM& vm, JSC::JSGlobalObject* globalObject, JSC::Structure* structure, JSObject* prototype)
+{
+    JSArrayBufferSinkConstructor* ptr = new (NotNull, JSC::allocateCell<JSArrayBufferSinkConstructor>(vm)) JSArrayBufferSinkConstructor(vm, structure, ArrayBufferSink__construct);
+    ptr->finishCreation(vm, globalObject, prototype);
+    return ptr;
+}
+
+JSArrayBufferSink* JSArrayBufferSink::create(JSC::VM& vm, JSC::JSGlobalObject* globalObject, JSC::Structure* structure, void* sinkPtr)
+{
+    JSArrayBufferSink* ptr = new (NotNull, JSC::allocateCell<JSArrayBufferSink>(vm)) JSArrayBufferSink(vm, structure, sinkPtr);
+    ptr->finishCreation(vm);
+    return ptr;
+}
+
+JSReadableArrayBufferSinkController* JSReadableArrayBufferSinkController::create(JSC::VM& vm, JSC::JSGlobalObject* globalObject, JSC::Structure* structure, void* sinkPtr)
+{
+    JSReadableArrayBufferSinkController* ptr = new (NotNull, JSC::allocateCell<JSReadableArrayBufferSinkController>(vm)) JSReadableArrayBufferSinkController(vm, structure, sinkPtr);
+    ptr->finishCreation(vm);
+    return ptr;
+}
+
+void JSArrayBufferSinkConstructor::finishCreation(VM& vm, JSC::JSGlobalObject* globalObject, JSObject* prototype)
+{
+    Base::finishCreation(vm);
+    ASSERT(inherits(info()));
+    initializeProperties(vm, globalObject, prototype);
+}
+
+JSC::EncodedJSValue JSC_HOST_CALL_ATTRIBUTES JSArrayBufferSinkConstructor::construct(JSC::JSGlobalObject* globalObject, JSC::CallFrame* callFrame)
+{
+    return ArrayBufferSink__construct(globalObject, callFrame);
+}
+
+void JSArrayBufferSinkConstructor::initializeProperties(VM& vm, JSC::JSGlobalObject* globalObject, JSObject* prototype)
+{
+    putDirect(vm, vm.propertyNames->length, jsNumber(0), JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::DontEnum);
+    JSString* nameString = jsNontrivialString(vm, "ArrayBufferSink"_s);
+    m_originalName.set(vm, this, nameString);
+    putDirect(vm, vm.propertyNames->name, nameString, JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::DontEnum);
+}
+
+void JSArrayBufferSinkPrototype::finishCreation(JSC::VM& vm, JSC::JSGlobalObject* globalObject)
+{
+    Base::finishCreation(vm);
+    reifyStaticProperties(vm, JSArrayBufferSink::info(), JSArrayBufferSinkPrototypeTableValues, *this);
+    JSC_TO_STRING_TAG_WITHOUT_TRANSITION();
+}
+
+void JSReadableArrayBufferSinkControllerPrototype::finishCreation(JSC::VM& vm, JSC::JSGlobalObject* globalObject)
+{
+    Base::finishCreation(vm);
+    reifyStaticProperties(vm, JSReadableArrayBufferSinkController::info(), JSReadableArrayBufferSinkControllerPrototypeTableValues, *this);
+    JSC_TO_STRING_TAG_WITHOUT_TRANSITION();
+}
+
+void JSArrayBufferSink::finishCreation(VM& vm)
+{
+    Base::finishCreation(vm);
+    ASSERT(inherits(info()));
+}
+
+void JSReadableArrayBufferSinkController::finishCreation(VM& vm)
+{
+    Base::finishCreation(vm);
+    ASSERT(inherits(info()));
+}
+
+void JSArrayBufferSink::analyzeHeap(JSCell* cell, HeapAnalyzer& analyzer)
+{
+    auto* thisObject = jsCast<JSArrayBufferSink*>(cell);
+    if (void* wrapped = thisObject->wrapped()) {
+        analyzer.setWrappedObjectForCell(cell, wrapped);
+        // if (thisObject->scriptExecutionContext())
+        //     analyzer.setLabelForCell(cell, "url " + thisObject->scriptExecutionContext()->url().string());
+    }
+    Base::analyzeHeap(cell, analyzer);
+}
+
+void JSReadableArrayBufferSinkController::analyzeHeap(JSCell* cell, HeapAnalyzer& analyzer)
+{
+    auto* thisObject = jsCast<JSReadableArrayBufferSinkController*>(cell);
+    if (void* wrapped = thisObject->wrapped()) {
+        analyzer.setWrappedObjectForCell(cell, wrapped);
+        // if (thisObject->scriptExecutionContext())
+        //     analyzer.setLabelForCell(cell, "url " + thisObject->scriptExecutionContext()->url().string());
+    }
+    Base::analyzeHeap(cell, analyzer);
+}
+
+template<typename Visitor>
+void JSReadableArrayBufferSinkController::visitChildrenImpl(JSCell* cell, Visitor& visitor)
+{
+    JSReadableArrayBufferSinkController* thisObject = jsCast<JSReadableArrayBufferSinkController*>(cell);
+    ASSERT_GC_OBJECT_INHERITS(thisObject, info());
+    Base::visitChildren(thisObject, visitor);
+    visitor.append(thisObject->m_onPull);
+    visitor.append(thisObject->m_onClose);
+    visitor.append(thisObject->m_weakReadableStream);
+}
+
+DEFINE_VISIT_CHILDREN(JSReadableArrayBufferSinkController);
+
+void JSReadableArrayBufferSinkController::start(JSC::JSGlobalObject* globalObject, JSC::JSValue readableStream, JSC::JSFunction* onPull, JSC::JSFunction* onClose)
+{
+    this->m_weakReadableStream = JSC::Weak<JSC::JSObject>(readableStream.getObject());
+    this->m_onPull.set(globalObject->vm(), this, onPull);
+    this->m_onClose.set(globalObject->vm(), this, onClose);
+}
+
+void JSArrayBufferSink::destroy(JSCell* cell)
+{
+    static_cast<JSArrayBufferSink*>(cell)->JSArrayBufferSink::~JSArrayBufferSink();
+}
+
+void JSReadableArrayBufferSinkController::destroy(JSCell* cell)
+{
+    static_cast<JSReadableArrayBufferSinkController*>(cell)->JSReadableArrayBufferSinkController::~JSReadableArrayBufferSinkController();
+}
+
+JSObject* createJSSinkPrototype(JSC::VM& vm, JSC::JSGlobalObject* globalObject, SinkID sinkID)
+{
+    switch (sinkID) {
+
+    case ArrayBufferSink:
+        return JSArrayBufferSinkPrototype::create(vm, globalObject, JSArrayBufferSinkPrototype::createStructure(vm, globalObject, globalObject->objectPrototype()));
+
+    default:
+        RELEASE_ASSERT_NOT_REACHED();
+    }
+}
+JSObject* createJSSinkControllerPrototype(JSC::VM& vm, JSC::JSGlobalObject* globalObject, SinkID sinkID)
+{
+    switch (sinkID) {
+
+    case ArrayBufferSink:
+        return JSReadableArrayBufferSinkControllerPrototype::create(vm, globalObject, JSReadableArrayBufferSinkControllerPrototype::createStructure(vm, globalObject, globalObject->objectPrototype()));
+
+    default:
+        RELEASE_ASSERT_NOT_REACHED();
+    }
+}
+} // namespace WebCore
+
+extern "C" JSC__JSValue ArrayBufferSink__createObject(JSC__JSGlobalObject* arg0, void* sinkPtr)
+{
+    auto& vm = arg0->vm();
+    Zig::GlobalObject* globalObject = reinterpret_cast<Zig::GlobalObject*>(arg0);
+    JSC::JSValue prototype = globalObject->ArrayBufferSinkPrototype();
+    JSC::Structure* structure = WebCore::JSArrayBufferSink::createStructure(vm, globalObject, prototype);
+    return JSC::JSValue::encode(WebCore::JSArrayBufferSink::create(vm, globalObject, structure, sinkPtr));
+}
+
+extern "C" void* ArrayBufferSink__fromJS(JSC__JSGlobalObject* arg0, JSC__JSValue JSValue1)
+{
+    JSC::VM& vm = WebCore::getVM(arg0);
+    if (auto* sink = JSC::jsDynamicCast<WebCore::JSArrayBufferSink*>(JSC::JSValue::decode(JSValue1)))
+        return sink->wrapped();
+
+    if (auto* controller = JSC::jsDynamicCast<WebCore::JSReadableArrayBufferSinkController*>(JSC::JSValue::decode(JSValue1)))
+        return controller->wrapped();
+
+    return nullptr;
+}
+
+extern "C" JSC__JSValue ArrayBufferSink__assignToStream(JSC__JSGlobalObject* arg0, JSC__JSValue stream, void* sinkPtr, int32_t* bunNativeTag, void** bunNativePtr)
+{
+    auto& vm = arg0->vm();
+    Zig::GlobalObject* globalObject = reinterpret_cast<Zig::GlobalObject*>(arg0);
+    auto clientData = WebCore::clientData(vm);
+    JSC::JSObject* readableStream = JSC::JSValue::decode(stream).getObject();
+
+    if (JSC::JSValue tag = readableStream->get(globalObject, clientData->builtinNames().bunNativeTypePrivateName())) {
+        if (tag.isInt32()) {
+            int32_t tagNumber = tag.toInt32(arg0);
+            if (tagNumber > 0 && tagNumber < 5) {
+                *bunNativeTag = tagNumber;
+                *bunNativePtr = reinterpret_cast<void*>(bitwise_cast<uintptr_t>(readableStream->get(globalObject, clientData->builtinNames().bunNativePtrPrivateName()).asNumber()));
+                return JSC::JSValue::encode(JSC::jsNull());
+            }
+        }
+    }
+
+    JSC::JSValue prototype = globalObject->JSReadableArrayBufferSinkControllerPrototype();
+    JSC::Structure* structure = WebCore::JSReadableArrayBufferSinkController::createStructure(vm, globalObject, prototype);
+    WebCore::JSReadableArrayBufferSinkController* controller = WebCore::JSReadableArrayBufferSinkController::create(vm, globalObject, structure, sinkPtr);
+
+    JSC::JSObject* function = globalObject->getDirect(vm, clientData->builtinNames().assignDirectStreamPrivateName()).getObject();
+    auto callData = JSC::getCallData(function);
+    JSC::MarkedArgumentBuffer arguments;
+    arguments.append(JSC::JSValue::decode(stream));
+    arguments.append(controller);
+
+    auto result = JSC::call(arg0, function, callData, JSC::jsUndefined(), arguments);
+    return JSC::JSValue::encode(result);
+}