The class is used to implement pattern Mediator. The common idea of the class has been taken from NodeJS native class EventEmitter and class BackboneJS Events.

npm install ontime-eventemitter

import { EvenEmitter } from 'ontime-eventemitter';

const emitter: EvenEmitter = new EvenEmitter();

// create callback function
const cb = (name: string): void => console.log('Hello', name);

// subscribe callback
emitter.on('say', cb);

// send event
emitter.emit('say', 'John'); // -> Hello John
emitter.emit('say', 'Helen'); // -> Hello Helen

// unsubscribe callback
emitter.off('say', cb);

on(name: name, callback: Function) - Subscribe callback. The callback will be invoked whenever the event is fired.

once(name: name, callback: Function) - Just like "on", but causes the callback to fire only once before being removed.

off(name: name, callback: Function) - Unsubscribe previously callback.

emit(name: name, [...args]) - Emit callbacks for the given event. Subsequent arguments to trigger will be passed along to the event callbacks.

stopListening() - Remove all listeners.