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diff --git a/src/bun.js/bindings/webcore/JSEventTargetCustom.h b/src/bun.js/bindings/webcore/JSEventTargetCustom.h
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+++ b/src/bun.js/bindings/webcore/JSEventTargetCustom.h
@@ -0,0 +1,77 @@
+/*
+ * 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 "JSDOMBinding.h"
+#include "JSDOMOperation.h"
+
+namespace WebCore {
+
+// Wrapper type for JSEventTarget's castedThis because JSDOMWindow and JSWorkerGlobalScope do not inherit JSEventTarget.
+class JSEventTargetWrapper {
+    WTF_MAKE_FAST_ALLOCATED;
+
+public:
+    JSEventTargetWrapper(EventTarget& wrapped, JSC::JSObject& wrapper)
+        : m_wrapped(wrapped)
+        , m_wrapper(wrapper)
+    {
+    }
+
+    EventTarget& wrapped() { return m_wrapped; }
+
+    operator JSC::JSObject&() { return m_wrapper; }
+
+private:
+    EventTarget& m_wrapped;
+    JSC::JSObject& m_wrapper;
+};
+
+std::unique_ptr<JSEventTargetWrapper> jsEventTargetCast(JSC::VM&, JSC::JSValue thisValue);
+
+template<> class IDLOperation<JSEventTarget> {
+public:
+    using ClassParameter = JSEventTargetWrapper*;
+    using Operation = JSC::EncodedJSValue(JSC::JSGlobalObject*, JSC::CallFrame*, ClassParameter);
+
+    template<Operation operation, CastedThisErrorBehavior = CastedThisErrorBehavior::Throw>
+    static JSC::EncodedJSValue call(JSC::JSGlobalObject& lexicalGlobalObject, JSC::CallFrame& callFrame, const char* operationName)
+    {
+        auto& vm = JSC::getVM(&lexicalGlobalObject);
+        auto throwScope = DECLARE_THROW_SCOPE(vm);
+
+        auto thisValue = callFrame.thisValue().toThis(&lexicalGlobalObject, JSC::ECMAMode::strict());
+        auto thisObject = jsEventTargetCast(vm, thisValue.isUndefinedOrNull() ? JSC::JSValue(&lexicalGlobalObject) : thisValue);
+        if (UNLIKELY(!thisObject))
+            return throwThisTypeError(lexicalGlobalObject, throwScope, "EventTarget", operationName);
+
+        auto& wrapped = thisObject->wrapped();
+
+        RELEASE_AND_RETURN(throwScope, (operation(&lexicalGlobalObject, &callFrame, thisObject.get())));
+    }
+};
+
+} // namespace WebCore