medikoo/deferredでresolve/rejectどっちが呼ばれても同じ処理をしたぃ時にっかぅ`.cb()` チェインもできるし、ぃーかんじ↑

callbackDeferred.js

var deferred = require('deferred');
var _ = require('lodash');

var def = deferred();
_.delay(function(){
  def.reject(new Error('error'));
  //def.resolve('success');
}, 1000);

def.promise.cb(function(result){
  console.log(1);
  return result;
}).cb(function(result){
  console.log(2);
  console.log(result);
});