Add HTMLCollectionOf alias for back-compat

Author: RReverser

baselines/dom.generated.d.ts

@@ -20062,6 +20062,8 @@ type RTCTransport = RTCDtlsTransport | RTCSrtpSdesTransport;
 /** @deprecated */
 type MouseWheelEvent = WheelEvent;
 type WindowProxy = Window;
+/** @deprecated */
+type HTMLCollectionOf<T extends Element> = HTMLCollection<T>;
 type AlignSetting = "center" | "end" | "left" | "right" | "start";
 type AnimationPlayState = "finished" | "idle" | "paused" | "running";
 type AppendMode = "segments" | "sequence";

inputfiles/addedTypes.json

@@ -2338,6 +2338,17 @@
                         "type": "ModuleImports"
                     }
                 ]
+            },
+            {
+                "deprecated": 1,
+                "new-type": "HTMLCollectionOf",
+                "type-parameters": [
+                    {
+                        "name": "T",
+                        "extends": "Element"
+                    }
+                ],
+                "override-type": "HTMLCollection<T>"
             }
         ]
     }

inputfiles/knownTypes.json

@@ -35,6 +35,7 @@
         "HmacImportParams",
         "HmacKeyAlgorithm",
         "HmacKeyGenParams",
+        "HTMLCollectionOf",
         "IDBKeyPath",
         "IDBValidKey",
         "ImageBitmapRenderingContextSettings",