JS Event Emitter implementation

EventEmitter.js

class EventEmitter{
  constructor(){
    this.events = {}
  }
  on(event, callback){
    if (!this.events.hasOwnProperty(event)){
      this.events[event] = [];
    }
    this.events[event].push(callback);
  }

  emit(event, ...args){
    this.events[event].forEach((fn) => {
      fn(...args)
    })
  }

  removeListener(event, callback) {
    this.events[event] = this.events[event].filter(cbk => callback !== cbk)
  }
}