LibWeb: Change the IDL type of MessageEvent::data to any

Userland/Libraries/LibWeb/HTML/MessageEvent.h

@@ -14,25 +14,25 @@ class MessageEvent : public DOM::Event {
 public:
     using WrapperType = Bindings::MessageEventWrapper;
 
-    static NonnullRefPtr<MessageEvent> create(const FlyString& event_name, const String& data, const String& origin)
+    static NonnullRefPtr<MessageEvent> create(const FlyString& event_name, JS::Value data, String const& origin)
     {
         return adopt_ref(*new MessageEvent(event_name, data, origin));
     }
 
     virtual ~MessageEvent() override = default;
 
-    const String& data() const { return m_data; }
-    const String& origin() const { return m_origin; }
+    JS::Value data() const { return m_data; }
+    String const& origin() const { return m_origin; }
 
 protected:
-    MessageEvent(const FlyString& event_name, const String& data, const String& origin)
+    MessageEvent(const FlyString& event_name, JS::Value data, String origin)
         : DOM::Event(event_name)
         , m_data(data)
-        , m_origin(origin)
+        , m_origin(move(origin))
     {
     }
 
-    String m_data;
+    JS::Value m_data;
     String m_origin;
 };
 

Userland/Libraries/LibWeb/HTML/MessageEvent.idl

@@ -1,7 +1,6 @@
 interface MessageEvent : Event {
 
-    // FIXME: This should be of type "any" instead of "USVString"
-    readonly attribute USVString data;
+    readonly attribute any data;
     readonly attribute USVString origin;
 
 };

Userland/Libraries/LibWeb/HTML/MessagePort.cpp

@@ -80,7 +80,7 @@ void MessagePort::post_message(JS::Value message)
     // FIXME: This is an ad-hoc hack implementation instead, since we don't currently
     //        have serialization and deserialization of messages.
     main_thread_event_loop().task_queue().add(HTML::Task::create(HTML::Task::Source::PostedMessage, nullptr, [strong_port = NonnullRefPtr { *target_port }, message]() mutable {
-        strong_port->dispatch_event(MessageEvent::create(HTML::EventNames::message, message.to_string_without_side_effects(), "<origin>"));
+        strong_port->dispatch_event(MessageEvent::create(HTML::EventNames::message, message, "<origin>"));
     }));
 }
 

Userland/Libraries/LibWeb/HTML/WebSocket.cpp

@@ -203,7 +203,7 @@ void WebSocket::on_message(ByteBuffer message, bool is_text)
         return;
     if (is_text) {
         auto text_message = String(ReadonlyBytes(message));
-        dispatch_event(MessageEvent::create(EventNames::message, text_message, url()));
+        dispatch_event(MessageEvent::create(EventNames::message, JS::js_string(wrapper()->vm(), text_message), url()));
         return;
     }
     // type indicates that the data is Binary and binaryType is "blob"