Add back Event.srcElement declaration

Author: mhegazy

baselines/dom.generated.d.ts

@@ -4847,6 +4847,7 @@ interface Event {
      */
     readonly isTrusted: boolean;
     returnValue: boolean;
+    readonly srcElement: Element | null;
     /**
      * Returns the object to which event is dispatched (its target).
      */

baselines/webworker.generated.d.ts

@@ -1019,6 +1019,7 @@ interface Event {
      */
     readonly isTrusted: boolean;
     returnValue: boolean;
+    readonly srcElement: object | null;
     /**
      * Returns the object to which event is dispatched (its target).
      */

inputfiles/overridingTypes.json

@@ -2181,7 +2181,15 @@
             },
             "Event": {
                 "name": "Event",
-                "override-exposed": "Window Worker"
+                "override-exposed": "Window Worker",
+                "properties": {
+                    "property": {
+                        "srcElement": {
+                            "type": "Element",
+                            "nullable": 1
+                        }
+                    }
+                }
             },
             "ReadableStream": {
                 "name": "ReadableStream",

inputfiles/removedTypes.json

@@ -49,13 +49,6 @@
                     }
                 }
             },
-            "Event": {
-                "properties": {
-                    "property": {
-                        "srcElement": null
-                    }
-                }
-            },
             "FileReaderProgressEvent": null,
             "HTMLAreasCollection": null,
             "HTMLBodyElement": {

src/emitter.ts

@@ -168,7 +168,7 @@ export function emitWebIDl(webidl: Browser.WebIdl, flavor: Flavor) {
             const eventType = eType === "Event" || dependsOn(eType, "Event") ? eType : defaultEventType;
             return { name: p.name, eventName, eventType };
         }));
-    
+
     const iNameToConstList = arrayToMap(allInterfaces, i => i.name, i =>
         !i.constants ? [] : mapToArray(i.constants.constant));
 
@@ -328,6 +328,7 @@ export function emitWebIDl(webidl: Browser.WebIdl, flavor: Flavor) {
             case "EventListener": return "EventListenerOrEventListenerObject";
         }
         if (flavor === Flavor.Web && objDomType === "Client") return "object";
+        if (flavor === Flavor.Worker && objDomType === "Element") return "object";
         // Name of an interface / enum / dict. Just return itself
         if (allInterfacesMap[objDomType] ||
             allLegacyWindowAliases.includes(objDomType) ||