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