thing.js

var Q = require('q');
var util = require('util');
var EventEmitter = require('events').EventEmitter;

function MyTask() {
  EventEmitter.call(this);
  this._deferred = Q.defer();
  this.then = this._deferred.then.bind(this._deferred); // ???
}
util.extends(MyTask, EventEmitter);

MyTask.prototype.run = function() {
  this.run = function() { return this; };

  // Sample code
  var self = this;
  setTimeout(function() {
    self._deferred.resolve(123);
  }, 1000);

  return this;
};

exports.MyTask = MyTask;


var mt = new MyTask();
mt.on("debug", console.debug);
mt.run({}, etc).then(something);