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diff --git a/src/bun.js/bindings/webcore/MessageEvent.h b/src/bun.js/bindings/webcore/MessageEvent.h
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+++ b/src/bun.js/bindings/webcore/MessageEvent.h
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+/*
+ * Copyright (C) 2007 Henry Mason (hmason@mac.com)
+ * Copyright (C) 2003-2018 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 "Event.h"
+#include "JSValueInWrappedObject.h"
+// #include "MessagePort.h"
+// #include "SerializedScriptValue.h"
+// #include "ServiceWorker.h"
+// #include "WindowProxy.h"
+#include <variant>
+
+namespace WebCore {
+
+class MessagePort : public RefCounted<MessagePort> {
+};
+
+class MessageEventSource {
+};
+
+class MessageEvent final : public Event {
+    WTF_MAKE_ISO_ALLOCATED(MessageEvent);
+
+public:
+    struct JSValueTag {
+    };
+    // using DataType = std::variant<JSValueTag, Ref<SerializedScriptValue>, String, Ref<Blob>, Ref<ArrayBuffer>>;
+    using DataType = std::variant<JSValueTag, String, Ref<ArrayBuffer>>;
+    static Ref<MessageEvent> create(const AtomString& type, DataType&&, const String& origin = {}, const String& lastEventId = {}, std::optional<MessageEventSource>&& = std::nullopt /*, Vector<RefPtr<MessagePort>>&& = {}*/);
+    static Ref<MessageEvent> create(DataType&&, const String& origin = {}, const String& lastEventId = {}, std::optional<MessageEventSource>&& = std::nullopt /*, Vector<RefPtr<MessagePort>>&& = {}*/);
+    static Ref<MessageEvent> createForBindings();
+
+    struct Init : EventInit {
+        JSC::JSValue data;
+        String origin;
+        String lastEventId;
+        std::optional<MessageEventSource> source;
+        // Vector<RefPtr<MessagePort>> ports;
+    };
+    static Ref<MessageEvent> create(const AtomString& type, Init&&, IsTrusted = IsTrusted::No);
+
+    virtual ~MessageEvent();
+
+    void initMessageEvent(const AtomString& type, bool canBubble, bool cancelable, JSC::JSValue data, const String& origin, const String& lastEventId, std::optional<MessageEventSource>&& /*, Vector<RefPtr<MessagePort>>&&*/);
+
+    const String& origin() const { return m_origin; }
+    const String& lastEventId() const { return m_lastEventId; }
+    const std::optional<MessageEventSource>& source() const { return m_source; }
+    // const Vector<RefPtr<MessagePort>>& ports() const { return m_ports; }
+
+    const DataType& data() const { return m_data; }
+
+    JSValueInWrappedObject& jsData() { return m_jsData; }
+    JSValueInWrappedObject& cachedData() { return m_cachedData; }
+    JSValueInWrappedObject& cachedPorts() { return m_cachedPorts; }
+
+    size_t memoryCost() const;
+
+private:
+    MessageEvent();
+    MessageEvent(const AtomString& type, Init&&, IsTrusted);
+    MessageEvent(const AtomString& type, DataType&&, const String& origin, const String& lastEventId = {}, std::optional<MessageEventSource>&& = std::nullopt /*, Vector<RefPtr<MessagePort>>&& = {}*/);
+
+    EventInterface eventInterface() const final;
+
+    DataType m_data;
+    String m_origin;
+    String m_lastEventId;
+    std::optional<MessageEventSource> m_source;
+    // Vector<RefPtr<MessagePort>> m_ports;
+
+    JSValueInWrappedObject m_jsData;
+    JSValueInWrappedObject m_cachedData;
+    JSValueInWrappedObject m_cachedPorts;
+
+    mutable Lock m_concurrentDataAccessLock;
+};
+
+} // namespace WebCore