frontend/polyfills.js
'use strict'; if (typeof Promise === 'undefined') { // Rejection tracking prevents a common issue where React gets into an // inconsistent state due to an error, but it gets swallowed by a Promise, // and the user has no idea what causes React's erratic future behavior. 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'); // In tests, polyfill requestAnimationFrame since jsdom doesn't provide it yet.// We don't polyfill it in the browser--this is user's responsibility.if (process.env.NODE_ENV === 'test') { require('raf').polyfill(global);}