Turn off transpilation to help debug ember apps

ember-cli-build.js

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

module.exports = function(defaults) {
  var config = {
    "ember-cli-qunit": {
        useLintTree: true
    },
    /* etc */
    babel: {
        includePolyfill: true
    },
    sourcemaps: {
      enabled: true,
      extensions: ['js']
    }
  };

  // blacklist certain transforms if in es6dev environment
  if(EmberApp.env() === "es6dev") {
    config.babel.blacklist = [
     'es6.forOf',
     'regenerator',
     'es6.arrowFunctions',
     'es6.constants',
     'es6.blockScoping',
     'es6.templateLiterals'];
  }

  var app = new EmberApp(defaults, config);

  // do stuff
  return app.toTree();