Class ObjectWrapper

front_end/core/common/Object.ts:41–116

}

export class ObjectWrapper<Events> implements EventTarget<Events> {
  // eslint-disable-next-line @typescript-eslint/no-explicit-any
  listeners?: Map<keyof Events, Set<ListenerCallbackTuple<Events, any>>>;

  addEventListener<T extends keyof Events>(eventType: T, listener: EventListener<Events, T>, thisObject?: Object):
      EventDescriptor<Events, T> {
    if (!this.listeners) {
      this.listeners = new Map();
    }

    let listenersForEventType = this.listeners.get(eventType);
    if (!listenersForEventType) {
      listenersForEventType = new Set();
      this.listeners.set(eventType, listenersForEventType);
    }
    listenersForEventType.add({thisObject, listener});
    return {eventTarget: this, eventType, thisObject, listener};
  }

  once<T extends keyof Events>(eventType: T): Promise<Events[T]> {
    return new Promise(resolve => {
      const descriptor = this.addEventListener(eventType, event => {
        this.removeEventListener(eventType, descriptor.listener);
        resolve(event.data);
      });
    });
  }

  removeEventListener<T extends keyof Events>(eventType: T, listener: EventListener<Events, T>, thisObject?: Object):
      void {
    const listeners = this.listeners?.get(eventType);
    if (!listeners) {
      return;
    }
    for (const listenerTuple of listeners) {
      if (listenerTuple.listener === listener && listenerTuple.thisObject === thisObject) {
        listenerTuple.disposed = true;
        listeners.delete(listenerTuple);
      }
    }

    if (!listeners.size) {
      this.listeners?.delete(eventType);
    }
  }

  hasEventListeners(eventType: keyof Events): boolean {
    return Boolean(this.listeners?.has(eventType));
  }

  dispatchEventToListeners<T extends keyof Events>(
      eventType: Platform.TypeScriptUtilities.NoUnion<T>,
      ...[eventData]: EventPayloadToRestParameters<Events, T>): void {
    const listeners = this.listeners?.get(eventType);
    if (!listeners) {
      return;
    }
    // `eventData` is typed as `Events[T] | undefined`: