emitThen.js

define(['EventEmitter', 'bluebird'], function (EventEmitter, Promise) {
  'use strict';

  EventEmitter.prototype.emitThen = function (event) {

    var args = Array.prototype.slice(arguments, 1);

    return Promise
      .bind(this)
      .thenReturn(this._events[event] || [])
      .map(function (handler) {
        return handler.apply(handler.context || this, args);
      })
      .thenReturn(null);
  };

  return EventEmitter;
});