Brocfile.js

/* global require, module */

var EmberApp   = require('ember-cli/lib/broccoli/ember-app');

var rework = require('broccoli-rework');

var app = new EmberApp({

  rework: function(css) {
    var calc         = require('rework-calc');
    var customMedia  = require('rework-custom-media');
    var inliner      = require('rework-npm');
    var vars         = require('rework-vars');
    var dedupe       = require('rework-deduplicate');
    var ease         = require('rework-plugin-ease');
    var inherit      = require('rework-inherit');
    var color        = require('rework-color-function');
    var hexAlpha     = require('rework-hex-alpha');
    //var fontVariant  = require('rework-font-variant');
    var namespace    = require('rework-namespace');
    var svg          = require('rework-svg');

    var ns = '';

    css
      .use(svg())
      .use(inliner())
      .use(customMedia)
      .use(vars())
      .use(calc)
      .use(hexAlpha)
      .use(color)
      .use(inherit())
      .use(ease())
      .use(dedupe())
      .use(namespace(ns))
      .toString({ sourcemap: true });
  },
  autoprefixer: {}
});
console.log(app);

// Use `app.import` to add additional libraries to the generated
// output files.
//
// If you need to use different assets in different
// environments, specify an object as the first parameter. That
// object's keys should be the environment name and the values
// should be the asset to use in that environment.
//
// If the library that you are including contains AMD or ES6
// modules that you would like to import into your application
// please specify an object with the list of modules as keys
// along with the exports of each module as its value.

module.exports = app.toTree();