text: require('promise/lib/rejection-tracking').enable();
  window.Promise = require('promise/lib/es6-extensions.js');
  // fetch() polyfill for making API calls.
  require('whatwg-fetch');
  
  // Object.assign() is commonly used with React.
  // It will use the native implementation if it's present and isn't buggy.
  Object.assign = require('object-assign');
  