use MessageEventSource

Author: saschanaz

baselines/dom.generated.d.ts

@@ -9465,7 +9465,7 @@ interface MessageEvent extends Event {
     readonly data: any;
     readonly origin: string;
     readonly ports: ReadonlyArray<MessagePort>;
-    readonly source: Window | null;
+    readonly source: MessageEventSource;
     initMessageEvent(type: string, bubbles: boolean, cancelable: boolean, data: any, origin: string, lastEventId: string, source: Window): void;
 }
 
@@ -16574,6 +16574,7 @@ type RTCTransport = RTCDtlsTransport | RTCSrtpSdesTransport;
 type USVString = string;
 type payloadtype = number;
 type ClientTypes = "window" | "worker" | "sharedworker" | "all";
+type MessageEventSource = Window | MessagePort | ServiceWorker;
 type AppendMode = "segments" | "sequence";
 type AudioContextLatencyCategory = "balanced" | "interactive" | "playback";
 type AudioContextState = "suspended" | "running" | "closed";

baselines/webworker.generated.d.ts

@@ -959,7 +959,7 @@ interface MessageEvent extends Event {
     readonly data: any;
     readonly origin: string;
     readonly ports: ReadonlyArray<MessagePort>;
-    readonly source: object | null;
+    readonly source: MessageEventSource;
     initMessageEvent(type: string, bubbles: boolean, cancelable: boolean, data: any, origin: string, lastEventId: string, source: object): void;
 }
 
@@ -1884,6 +1884,7 @@ type IDBKeyPath = string;
 type USVString = string;
 type payloadtype = number;
 type ClientTypes = "window" | "worker" | "sharedworker" | "all";
+type MessageEventSource = object | MessagePort | ServiceWorker;
 type BinaryType = "blob" | "arraybuffer";
 type IDBCursorDirection = "next" | "nextunique" | "prev" | "prevunique";
 type IDBRequestReadyState = "pending" | "done";

inputfiles/addedTypes.json

@@ -3001,6 +3001,20 @@
             {
                 "new-type": "ClientTypes",
                 "override-type": "\"window\" | \"worker\" | \"sharedworker\" | \"all\""
+            },
+            {
+                "new-type": "MessageEventSource",
+                "type": [
+                    {
+                        "type": "Window"
+                    },
+                    {
+                        "type": "MessagePort"
+                    },
+                    {
+                        "type": "ServiceWorker"
+                    }
+                ]
             }
         ]
     }

inputfiles/knownWorkerTypes.json

@@ -54,6 +54,7 @@
     "ImageData",
     "MessageChannel",
     "MessageEvent",
+    "MessageEventSource",
     "MessagePort",
     "NavigationPreloadManager",
     "NavigationPreloadState",

inputfiles/overridingTypes.json

@@ -1031,10 +1031,14 @@
             },
             "MessageEvent": {
                 "name": "MessageEvent",
-                "constructor": {
-                    "override-signatures": [
-                        "new(type: string, eventInitDict?: MessageEventInit): MessageEvent"
-                    ]
+                "properties": {
+                    "property": {
+                        "source": {
+                            "name": "source",
+                            "nullable": 0,
+                            "override-type": "MessageEventSource"
+                        }
+                    }
                 }
             },
             "File": {