Added type to CustomEvent constructor and ensured Custom Event initCustomEvent was correct.

Author: jthoms1

baselines/dom.generated.d.ts

@@ -2376,12 +2376,12 @@ declare var CSSSupportsRule: {
 
 interface CustomEvent<T = any> extends Event {
     readonly detail: T;
-    (typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, detailArg: T): void;
+    initCustomEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, detailArg: T): void;
 }
 
 declare var CustomEvent: {
     prototype: CustomEvent;
-    new(typeArg: string, eventInitDict?: CustomEventInit): CustomEvent;
+    new<T>(typeArg: string, eventInitDict?: CustomEventInit<T>): CustomEvent<T>;
 };
 
 interface DataCue extends TextTrackCue {

inputfiles/overridingTypes.json

@@ -31,7 +31,14 @@
         "interface": "CustomEvent",
         "name": "initCustomEvent",
         "signatures": [
-            "(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, detailArg: T): void"
+            "initCustomEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, detailArg: T): void"
+        ]
+    },
+    {
+        "kind": "constructor",
+        "interface": "CustomEvent",
+        "signatures": [
+            "new<T>(typeArg: string, eventInitDict?: CustomEventInit<T>): CustomEvent<T>"
         ]
     },
     {