Add type annotations for class that emit events

import { EventEmitter } from 'events';

type GenericListener = (...args: any[]) => void;

/**

 * Event description type

 * @public

 */

export type EventsDescription = Record<string, GenericListener>;

type CommonEvents = 'newListener' | 'removeListener';

/**

 * Typescript type safe event emitter

 * @public

 */

export declare interface TypedEventEmitter<Events extends EventsDescription> extends EventEmitter {

  addListener<EventKey extends keyof Events>(event: EventKey, listener: Events[EventKey]): this;

  addListener(

    event: CommonEvents,

    listener: (eventName: string | symbol, listener: GenericListener) => void

  ): this;

  addListener(event: symbol, listener: GenericListener): this;

  on<EventKey extends keyof Events>(event: EventKey, listener: Events[EventKey]): this;

  on(

    event: CommonEvents,

    listener: (eventName: string | symbol, listener: GenericListener) => void

  ): this;

  on(event: symbol, listener: GenericListener): this;

  once<EventKey extends keyof Events>(event: EventKey, listener: Events[EventKey]): this;

  once(

    event: CommonEvents,

    listener: (eventName: string | symbol, listener: GenericListener) => void

  ): this;

  once(event: symbol, listener: GenericListener): this;

  removeListener<EventKey extends keyof Events>(event: EventKey, listener: Events[EventKey]): this;

  removeListener(

    event: CommonEvents,

    listener: (eventName: string | symbol, listener: GenericListener) => void

  ): this;

  removeListener(event: symbol, listener: GenericListener): this;

  off<EventKey extends keyof Events>(event: EventKey, listener: Events[EventKey]): this;

  off(

    event: CommonEvents,

    listener: (eventName: string | symbol, listener: GenericListener) => void

  ): this;

  off(event: symbol, listener: GenericListener): this;

  removeAllListeners<EventKey extends keyof Events>(event?: EventKey | CommonEvents | symbol): this;

  listeners<EventKey extends keyof Events>(

    event: EventKey | CommonEvents | symbol

  ): Events[EventKey][];

  rawListeners<EventKey extends keyof Events>(

    event: EventKey | CommonEvents | symbol

  ): Events[EventKey][];

  emit<EventKey extends keyof Events>(

    event: EventKey | symbol,

    ...args: Parameters<Events[EventKey]>

  ): boolean;

  listenerCount<EventKey extends keyof Events>(type: EventKey | CommonEvents | symbol): number;

  prependListener<EventKey extends keyof Events>(event: EventKey, listener: Events[EventKey]): this;

  prependListener(

    event: CommonEvents,

    listener: (eventName: string | symbol, listener: GenericListener) => void

  ): this;

  prependListener(event: symbol, listener: GenericListener): this;

  prependOnceListener<EventKey extends keyof Events>(

    event: EventKey,

    listener: Events[EventKey]

  ): this;

  prependOnceListener(

    event: CommonEvents,

    listener: (eventName: string | symbol, listener: GenericListener) => void

  ): this;

  prependOnceListener(event: symbol, listener: GenericListener): this;

  eventNames(): string[];

  getMaxListeners(): number;

  setMaxListeners(n: number): this;

}

/**

 * Typescript type safe event emitter

 * @public

 */

export class TypedEventEmitter<Events extends EventsDescription> extends EventEmitter {}