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- type EventListener<Events, EventType extends keyof Events> = Events[EventType];
- export type EventParameters<Events, EventType extends keyof Events> = {
- [Event in EventType]: EventListener<Events, EventType> extends (...args: infer P) => any ? P : never;
- }[EventType];
- export declare class EventEmitter<EventTypes extends Record<string, (...args: any) => any>> {
- #private;
- /**
- * Adds the listener function to the end of the listeners array for the event.
- * No checks are made to see if the listener has already been added. Multiple calls passing
- * the same combination of event and listener will result in the listener being added, and
- * called, multiple times.
- * @returns this, so that calls can be chained
- */
- on<Event extends keyof EventTypes>(event: Event, listener: EventListener<EventTypes, Event>): this;
- /**
- * Removes the specified listener from the listener array for the event.
- * off() will remove, at most, one instance of a listener from the listener array. If any single
- * listener has been added multiple times to the listener array for the specified event, then
- * off() must be called multiple times to remove each instance.
- * @returns this, so that calls can be chained
- */
- off<Event extends keyof EventTypes>(event: Event, listener: EventListener<EventTypes, Event>): this;
- /**
- * Adds a one-time listener function for the event. The next time the event is triggered,
- * this listener is removed and then invoked.
- * @returns this, so that calls can be chained
- */
- once<Event extends keyof EventTypes>(event: Event, listener: EventListener<EventTypes, Event>): this;
- /**
- * This is similar to `.once()`, but returns a Promise that resolves the next time
- * the event is triggered, instead of calling a listener callback.
- * @returns a Promise that resolves the next time given event is triggered,
- * or rejects if an error is emitted. (If you request the 'error' event,
- * returns a promise that resolves with the error).
- *
- * Example:
- *
- * const message = await stream.emitted('message') // rejects if the stream errors
- */
- emitted<Event extends keyof EventTypes>(event: Event): Promise<EventParameters<EventTypes, Event> extends [infer Param] ? Param : EventParameters<EventTypes, Event> extends [] ? void : EventParameters<EventTypes, Event>>;
- protected _emit<Event extends keyof EventTypes>(this: EventEmitter<EventTypes>, event: Event, ...args: EventParameters<EventTypes, Event>): void;
- protected _hasListener(event: keyof EventTypes): boolean;
- }
- export {};
- //# sourceMappingURL=EventEmitter.d.ts.map
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