Method on

src/emitter.js:7–15

(event, fn)

export default class Emitter {
  // Add an event listener for given event
  on(event, fn) {
    this._callbacks = this._callbacks || {};
    // Create namespace for this event
    if (!this._callbacks[event]) {
      this._callbacks[event] = [];
    }
    this._callbacks[event].push(fn);
    return this;
  }

  emit(event, ...args) {
    this._callbacks = this._callbacks || {};