1 files changed, 14 insertions, 0 deletions
diff --git a/src/bun.js/bindings/ZigGlobalObject.cpp b/src/bun.js/bindings/ZigGlobalObject.cpp
index bcb462d42..0f4fe92e2 100644
--- a/src/bun.js/bindings/ZigGlobalObject.cpp
+++ b/src/bun.js/bindings/ZigGlobalObject.cpp
@@ -1137,6 +1137,15 @@ enum ReadableStreamTag : int32_t {
     Bytes = 4,
 };
 
+JSC_DEFINE_HOST_FUNCTION(functionCallNotImplemented,
+    (JSC::JSGlobalObject * globalObject, JSC::CallFrame* callFrame))
+{
+    auto& vm = globalObject->vm();
+    auto scope = DECLARE_THROW_SCOPE(vm);
+    throwTypeError(globalObject, scope, "Not implemented yet in Bun :("_s);
+    return JSC::JSValue::encode(JSC::JSValue {});
+}
+
 // we're trying out a new way to do this lazy loading
 static JSC_DEFINE_HOST_FUNCTION(functionLazyLoad,
     (JSC::JSGlobalObject * globalObject, JSC::CallFrame* callFrame))
@@ -1156,6 +1165,7 @@ JSC:
         static NeverDestroyed<const String> bunStreamString(MAKE_STATIC_STRING_IMPL("bun:stream"));
         static NeverDestroyed<const String> noopString(MAKE_STATIC_STRING_IMPL("noop"));
         static NeverDestroyed<const String> createImportMeta(MAKE_STATIC_STRING_IMPL("createImportMeta"));
+        static NeverDestroyed<const String> masqueradesAsUndefined(MAKE_STATIC_STRING_IMPL("masqueradesAsUndefined"));
 
         JSC::JSValue moduleName = callFrame->argument(0);
         if (moduleName.isNumber()) {
@@ -1235,6 +1245,10 @@ JSC:
             return JSValue::encode(obj);
         }
 
+        if (string == masqueradesAsUndefined) {
+            return JSValue::encode(InternalFunction::createFunctionThatMasqueradesAsUndefined(vm, globalObject, 0, String(), functionCallNotImplemented));
+        }
+
         if (UNLIKELY(string == noopString)) {
             auto* obj = constructEmptyObject(globalObject);
             obj->putDirectCustomAccessor(vm, JSC::PropertyName(JSC::Identifier::fromString(vm, "getterSetter"_s)), JSC::CustomGetterSetter::create(vm, noop_getter, noop_setter), 0);