Method once

front_end/core/common/EventTarget.ts:34–34

(eventType: T)

  addEventListener<T extends keyof Events>(eventType: T, listener: EventListener<Events, T>, thisObject?: Object):
      EventDescriptor<Events, T>;
  once<T extends keyof Events>(eventType: T): Promise<Events[T]>;
  removeEventListener<T extends keyof Events>(eventType: T, listener: EventListener<Events, T>, thisObject?: Object):
      void;
  hasEventListeners(eventType: keyof Events): boolean;