fix polyfill NodeList forEach (#357)

src/replay/index.ts

@@ -102,7 +102,6 @@ export class Replayer {
     this.getCastFn = this.getCastFn.bind(this);
     this.emitter.on(ReplayerEvents.Resize, this.handleResize as Handler);
 
-    polyfill();
     this.setupDom();
 
     this.treeIndex = new TreeIndex();
@@ -330,6 +329,8 @@ export class Replayer {
         this.iframe.contentWindow,
         this.iframe.contentDocument,
       );
+
+      polyfill(this.iframe.contentWindow);
     }
   }
 

src/utils.ts

@@ -221,9 +221,9 @@ export function isTouchEvent(
   return Boolean((event as TouchEvent).changedTouches);
 }
 
-export function polyfill() {
-  if ('NodeList' in window && !NodeList.prototype.forEach) {
-    NodeList.prototype.forEach = (Array.prototype
+export function polyfill(win = window) {
+  if ('NodeList' in win && !win.NodeList.prototype.forEach) {
+    win.NodeList.prototype.forEach = (Array.prototype
       .forEach as unknown) as NodeList['forEach'];
   }
 }