loopback/lib/utils.js

exports.createPromiseCallback = createPromiseCallback;
var Promise = require('bluebird');

function createPromiseCallback() {
  var cb;
  var promise = new Promise(function(resolve, reject) {
    cb = function(err, data) {
      if (err) return reject(err);
      return resolve(data);
    };
  });
  cb.promise = promise;
  return cb;
}