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67 lines
2.5 KiB
67 lines
2.5 KiB
type EventNames<T extends string | symbol | { [K in string | symbol]: any[] }> = T extends string | symbol ? T : keyof T;
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type EventArgs<T extends string | symbol | { [K in string | symbol]: any[] }, K extends EventNames<T>> = T extends string | symbol ? any[] : K extends keyof T ? T[K] : never;
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/**
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* Minimal `EventEmitter` interface that is molded against the Node.js
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* `EventEmitter` interface.
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*/
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declare class EventEmitter<EventTypes extends string | symbol | { [K in keyof EventTypes]: any[] } = string | symbol> {
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static prefixed: string | boolean;
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/**
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* Return an array listing the events for which the emitter has registered
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* listeners.
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*/
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eventNames(): Array<EventNames<EventTypes>>;
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/**
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* Return the listeners registered for a given event.
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*/
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listeners<T extends EventNames<EventTypes>>(event: T): Array<EventEmitter.ListenerFn<EventArgs<EventTypes, T>>>;
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/**
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* Return the number of listeners listening to a given event.
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*/
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listenerCount(event: EventNames<EventTypes>): number;
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/**
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* Calls each of the listeners registered for a given event.
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*/
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emit<T extends EventNames<EventTypes>>(event: T, ...args: EventArgs<EventTypes, T>): boolean;
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/**
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* Add a listener for a given event.
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*/
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on<T extends EventNames<EventTypes>>(event: T, fn: EventEmitter.ListenerFn<EventArgs<EventTypes, T>>, context?: any): this;
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addListener<T extends EventNames<EventTypes>>(event: T, fn: EventEmitter.ListenerFn<EventArgs<EventTypes, T>>, context?: any): this;
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/**
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* Add a one-time listener for a given event.
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*/
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once<T extends EventNames<EventTypes>>(event: T, fn: EventEmitter.ListenerFn<EventArgs<EventTypes, T>>, context?: any): this;
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/**
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* Remove the listeners of a given event.
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*/
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removeListener<T extends EventNames<EventTypes>>(event: T, fn?: EventEmitter.ListenerFn<EventArgs<EventTypes, T>>, context?: any, once?: boolean): this;
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off<T extends EventNames<EventTypes>>(event: T, fn?: EventEmitter.ListenerFn<EventArgs<EventTypes, T>>, context?: any, once?: boolean): this;
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/**
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* Remove all listeners, or those of the specified event.
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*/
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removeAllListeners(event?: EventNames<EventTypes>): this;
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}
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declare namespace EventEmitter {
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export interface ListenerFn<Args extends any[] = any[]> {
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(...args: Args): void;
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}
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export interface EventEmitterStatic {
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new<EventTypes extends string | symbol | { [K in keyof EventTypes]: any[] } = string | symbol>(): EventEmitter<EventTypes>;
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}
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export const EventEmitter: EventEmitterStatic;
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}
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export = EventEmitter;
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