the latest code

node_modules/rxjs/src/internal/scheduler/AnimationFrameScheduler.ts

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+import { AsyncAction } from './AsyncAction';
+import { AsyncScheduler } from './AsyncScheduler';
+
+export class AnimationFrameScheduler extends AsyncScheduler {
+  public flush(action?: AsyncAction<any>): void {
+    this._active = true;
+    // The async id that effects a call to flush is stored in _scheduled.
+    // Before executing an action, it's necessary to check the action's async
+    // id to determine whether it's supposed to be executed in the current
+    // flush.
+    // Previous implementations of this method used a count to determine this,
+    // but that was unsound, as actions that are unsubscribed - i.e. cancelled -
+    // are removed from the actions array and that can shift actions that are
+    // scheduled to be executed in a subsequent flush into positions at which
+    // they are executed within the current flush.
+    let flushId;
+    if (action) {
+      flushId = action.id;
+    } else {
+      flushId = this._scheduled;
+      this._scheduled = undefined;
+    }
+
+    const { actions } = this;
+    let error: any;
+    action = action || actions.shift()!;
+
+    do {
+      if ((error = action.execute(action.state, action.delay))) {
+        break;
+      }
+    } while ((action = actions[0]) && action.id === flushId && actions.shift());
+
+    this._active = false;
+
+    if (error) {
+      while ((action = actions[0]) && action.id === flushId && actions.shift()) {
+        action.unsubscribe();
+      }
+      throw error;
+    }
+  }
+}