import { WorkboxEvent, WorkboxEventMap } from './WorkboxEvent.js'; export declare type ListenerCallback = (event: WorkboxEvent) => any; /** * A minimal `EventTarget` shim. * This is necessary because not all browsers support constructable * `EventTarget`, so using a real `EventTarget` will error. * @private */ export declare class WorkboxEventTarget { private readonly _eventListenerRegistry; /** * @param {string} type * @param {Function} listener * @private */ addEventListener(type: K, listener: (event: WorkboxEventMap[K]) => any): void; /** * @param {string} type * @param {Function} listener * @private */ removeEventListener(type: K, listener: (event: WorkboxEventMap[K]) => any): void; /** * @param {Object} event * @private */ dispatchEvent(event: WorkboxEvent): void; /** * Returns a Set of listeners associated with the passed event type. * If no handlers have been registered, an empty Set is returned. * * @param {string} type The event type. * @return {Set} An array of handler functions. * @private */ private _getEventListenersByType; }