old_contents: 'use strict';
  
  const EmberAddon = require('ember-cli/lib/broccoli/ember-addon');
  
  module.exports = function (defaults) {
    let app = new EmberAddon(defaults, {
      // 'ember-cli-babel': {
      //   includePolyfill: true
      // }
    });
  
    /*
     This build file specifies the options for the dummy test app of this
     addon, located in `/tests/dummy`
     This build file does *not* influence how the addon or the app using it
     behave. You most likely want to be modifying `./index.js` or app's build file
     */
  
    return app.toTree();
  };
  
new_contents: 'use strict';
  
  const EmberAddon = require('ember-cli/lib/broccoli/ember-addon');
  
  module.exports = function (defaults) {
    let app = new EmberAddon(defaults, {});
  
    /*
     This build file specifies the options for the dummy test app of this
     addon, located in `/tests/dummy`
     This build file does *not* influence how the addon or the app using it
     behave. You most likely want to be modifying `./index.js` or app's build file
     */
  
    return app.toTree();
  };
  
subject: Remove commented out babel polyfill