bluebird-promisifyAll-example.js

// see http://static-content-01.s3-website-us-east-1.amazonaws.com/Promise_promisifyAll___bluebird_1CEF7997.png
// catalist was to solve for promisifying cordova plugins and it's non-[standard|node] callback convention (successFn, errorFn) vs node's fn(error, success)
var Runner = function() {
    return this;
};

Runner.prototype.echo = function(msg, success, failure){
  success(msg);
};

Runner.prototype.echoFail = function(msg, success, failure){
  failure(new Error('error!'))
};

Promise.promisifyAll(Runner.prototype, {
  promisifier: function(cbApi) {
    return function() {
      var args = [].slice.call(arguments);
      var self = this;
      return new Promise(function(resolve, reject) {
        args.push(resolve, reject);
        cbApi.apply(self, args);
      });
    };
  }
});

var r = new Runner()

r.echoAsync('hello')
    .then(function(res) {
        console.log(res) // called
    })
    .catch(function(err) {
        console.error(err)
    })

r.echoFailAsync('hello')
    .then(function(res) {
        console.log(res)
    })
    .catch(function(err) {
        console.error(err) // called
    })

null;