DualEmitter.js cross-browser + node.js event emitter. Invoke custom or DOM event. Micro library in 35lines without jQuery!!!

dual-emitter.js

(function (name, that, fn) {
  if (typeof module !== 'undefined') {
    module.exports = fn();
  } else if (typeof define === 'function' && define.amd) {
    define(fn);
  } else {
    that[name] = fn();
  }
})('DualEmitter', this, function DualEmitter($) {
  $ = $ || this;
  $.events = $.events || {};
  $.hasEvent = function hasEvent(name) {
    return (name in $.events) ? $.events[name] : 0;
  };
  $.isDom = function isDom(obj) {
    obj = Object.prototype.toString.call(obj).slice(8, -1);
    return /HTML(?:.*)Element/.test(obj);
  };
  $.on = function on(name, fn, func) {
    if (typeof name !== 'string' || $.isDom(name)) {
      if (name.attachListener) {
        name.attachListener('on' + fn, func, false);
        return $;
      }
      name.addEventListener(fn, func, false);

      $.events['i:' + fn] = func;
      return $;
    }
    $.events[name] = fn;
    return $;
  };
  $.off = function off(name) {
    if(!$.hasEvent(name)) {delete $.events[name];}
    return $;
  };
  $.emit = function emit(args) {
    args = [].slice.call(arguments);
    args.shift().split(' ').forEach(function(e) {
      $.hasEvent(e).apply(this, args);
    });
    return $;
  };
  return $;
});

usage-example.js

var dualEmitter = new DualEmitter();

dualEmitter
  .on('test', function(one, two, arr, obj) {
    console.log('test', one, two, arr, obj);
    console.log('------------');
  })
  .on(document.querySelector('.customh1'), 'click', function(el, arg1, arg2) {
    console.log('you emit DOM event', el.textContent, arg1, arg2);
    console.log('------------');
  })
  .emit('test', 1, 2, [3, 4, 5], {six: 'seven'})
  // or you can emit DOM event with `i:` prefix, followed by event name
  .emit('i:click', document.querySelector('.customDiv'), 'arg1', 'arg2')