An implementation of a JavaScript module with an event emitter/listener system

JavaScriptClassWithEventsListener.js

/**
 * @see https://jsfiddle.net/cosmointeractive/ukb8Lpm1/
 */

const events = (function() {
  'use strict'

  var _triggers = {};

  const on = function(event, callback) {
    if (!_triggers[event]) {
      _triggers[event] = [];
    }
    _triggers[event].push(callback);
    return (this);
  };

  const triggerHandler = function(eventName) {
    if (_triggers[eventName]) {
      for (var i in _triggers[eventName]) {
        _triggers[eventName][i]();
      }
    }
  };

  return {
    on: on,
    triggerHandler: triggerHandler
  }
})();

var TheClass = (function(events) {
  'use strict'

  let _this = this;

  var defaults = {

  };

  let bindEvents = function() {
    module.on('eventCustom', function() {
      alert('Event internal!');
    });
  }

  let init = function(options) {
    bindEvents();
    return (this);
  }

  let module = $.extend({
    init: init,
    say: function() {
      this.triggerHandler('eventCustom')
    }
  }, events)

  return module;
})(events);

(function($) {
  TheClass.init({})
    .on('eventCustom', function() {
      alert('Event external one');
    })
    .say();
})(jQuery);