Method constructor

packages/core/src/event_emitter.ts:120–133

(isAsync: boolean = false)

  private readonly pendingTasks: PendingTasksInternal | undefined = undefined;

  constructor(isAsync: boolean = false) {
    super();
    this.__isAsync = isAsync;

    // Attempt to retrieve a `DestroyRef` and `PendingTasks` optionally.
    // For backwards compatibility reasons, this cannot be required.
    if (isInInjectionContext()) {
      // `DestroyRef` is optional because it is not available in all contexts.
      // But it is useful to properly complete the `EventEmitter` if used with `outputToObservable`
      // when the component/directive is destroyed. (See `outputToObservable` for more details.)
      this.destroyRef = inject(DestroyRef, {optional: true}) ?? undefined;
      this.pendingTasks = inject(PendingTasksInternal, {optional: true}) ?? undefined;
    }
  }

  emit(value?: any) {
    const prevConsumer = setActiveConsumer(null);