Makefile.es6

#!/usr/bin/env node --harmony
'use strict';

require('shelljs/make');
require('shelljs/global');

let os = require('os');
let path = require('path');
let wget = require('./wget');

target.all = function () {
  console.log(`Building Application\n\tOS: ${os.platform()}\n\t${os.arch()}`);
  target.setup();
  target.build();
}

target.setup = function () {
  console.log('====>\tDownloading dependencies');
  let dependencies = require('./dependencies')();  // generates the dependency array
  
  let target = path.join(__dirname, 'target');
  mkdir(target);
  cd(target);
  
  Promise.each(dependencies, function (dep) {
    return wget(dep);
  }).catch(function (error) {
    console.warn('ERROR': error);
    exit(error.code);
  });
}

wget.es6

let Promise = require('bluebird');
let wget = require('wget-improved');
let utils = require('./utilities');

module.exports = function (dep) {
  var deferred = Promise.pending();
  wget.download(dep.url, dep.filepath)
    .on('end', function () {
      utils.extract(dep.filepath);
      deffered.resolve();
    })
    .on('error', deferred.reject)
    .on('progress', function (progress) {
      // add to my progress bar here
      // this isn't a major concern right now
    });
  return deferred;
}