/**
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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<
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EventTypes extends EventEmitter.ValidEventTypes = string | symbol,
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Context extends any = any
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> {
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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<EventEmitter.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 EventEmitter.EventNames<EventTypes>>(
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event: T
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): Array<EventEmitter.EventListener<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: EventEmitter.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 EventEmitter.EventNames<EventTypes>>(
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event: T,
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...args: EventEmitter.EventArgs<EventTypes, T>
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): 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 EventEmitter.EventNames<EventTypes>>(
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event: T,
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fn: EventEmitter.EventListener<EventTypes, T>,
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context?: Context
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): this;
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addListener<T extends EventEmitter.EventNames<EventTypes>>(
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event: T,
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fn: EventEmitter.EventListener<EventTypes, T>,
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context?: Context
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): 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 EventEmitter.EventNames<EventTypes>>(
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event: T,
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fn: EventEmitter.EventListener<EventTypes, T>,
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context?: Context
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): 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 EventEmitter.EventNames<EventTypes>>(
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event: T,
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fn?: EventEmitter.EventListener<EventTypes, T>,
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context?: Context,
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once?: boolean
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): this;
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off<T extends EventEmitter.EventNames<EventTypes>>(
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event: T,
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fn?: EventEmitter.EventListener<EventTypes, T>,
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context?: Context,
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once?: boolean
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): 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?: EventEmitter.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 <
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EventTypes extends ValidEventTypes = string | symbol,
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Context = any
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>(): EventEmitter<EventTypes, Context>;
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}
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/**
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* `object` should be in either of the following forms:
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* ```
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* interface EventTypes {
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* 'event-with-parameters': any[]
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* 'event-with-example-handler': (...args: any[]) => void
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* }
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* ```
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*/
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export type ValidEventTypes = string | symbol | object;
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export type EventNames<T extends ValidEventTypes> = T extends string | symbol
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? T
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: keyof T;
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export type ArgumentMap<T extends object> = {
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[K in keyof T]: T[K] extends (...args: any[]) => void
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? Parameters<T[K]>
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: T[K] extends any[]
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? T[K]
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: any[];
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};
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export type EventListener<
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T extends ValidEventTypes,
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K extends EventNames<T>
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> = T extends string | symbol
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? (...args: any[]) => void
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: (
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...args: ArgumentMap<Exclude<T, string | symbol>>[Extract<K, keyof T>]
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) => void;
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export type EventArgs<
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T extends ValidEventTypes,
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K extends EventNames<T>
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> = Parameters<EventListener<T, K>>;
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export const EventEmitter: EventEmitterStatic;
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}
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export = EventEmitter;
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