import { AsyncAction } from './AsyncAction'; import { AsyncScheduler } from './AsyncScheduler'; export class AnimationFrameScheduler extends AsyncScheduler { public flush(action?: AsyncAction): void { this._active = true; this._scheduled = undefined; const { actions } = this; let error: any; let index = -1; action = action || actions.shift()!; const count = actions.length; do { if ((error = action.execute(action.state, action.delay))) { break; } } while (++index < count && (action = actions.shift())); this._active = false; if (error) { while (++index < count && (action = actions.shift())) { action.unsubscribe(); } throw error; } } }