Merge pull request #216 from Microsoft/addIndexerToHTMLCollectionOf

Fix #213: Add index signature to HTMLCollectionOf

Author: mhegazy

baselines/dom.generated.d.ts

@@ -13899,6 +13899,7 @@ interface NodeListOf<TNode extends Node> extends NodeList {
 interface HTMLCollectionOf<T extends Element> extends HTMLCollection {
     item(index: number): T;
     namedItem(name: string): T;
+    [index: number]: T;
 }
 
 interface BlobPropertyBag {

inputfiles/addedTypes.json

@@ -270,6 +270,11 @@
                 "name": "namedItem",
                 "signatures": ["namedItem(name: string): T"]
             }
+        ],
+        "indexer": [
+            {
+                "signatures": ["[index: number]: T"]
+            }
         ]
     },
     {