Corrected the indexers of HTMLCollection and HTMLCollectionOf

Author: FranklinWhale

baselines/dom.generated.d.ts

@@ -4460,7 +4460,8 @@ interface HTMLCollection {
       * Retrieves a select object or an object from an options collection.
       */
     namedItem(name: string): Element;
-    [indexOrName: number | string]: Element;
+    [index: number]: Element;
+    [name: string]: Element;
 }
 
 declare var HTMLCollection: {
@@ -13626,7 +13627,8 @@ interface NodeListOf<TNode extends Node> extends NodeList {
 interface HTMLCollectionOf<T extends Element> extends HTMLCollection {
     item(index: number): T;
     namedItem(name: string): T;
-    [indexOrName: number | string]: T;
+    [index: number]: T;
+    [name: string]: T;
 }
 
 interface BlobPropertyBag {

inputfiles/addedTypes.json

@@ -104,7 +104,10 @@
         ],
         "indexer": [
             {
-                "signatures": ["[indexOrName: number | string]: T"]
+                "signatures": [
+                    "[index: number]: T",
+                    "[name: string]: T"
+                ]
             }
         ]
     },
@@ -209,7 +212,10 @@
     {
         "kind": "indexer",
         "interface": "HTMLCollection",
-        "signatures": ["[indexOrName: number | string]: Element"]
+        "signatures": [
+            "[index: number]: Element",
+            "[name: string]: Element"
+        ]
     },
     {
         "kind": "signatureoverload",