text: /**
   * Copyright 2020 Google LLC
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  // These must be the first lines in src/index.js
  import 'react-app-polyfill/ie9';
  import 'react-app-polyfill/stable';
  import 'bootstrap/dist/css/bootstrap.css';
  import 'font-awesome/css/font-awesome.css';
  import './index.css';
  
  import * as serviceWorker from './serviceWorker';
  
  import App from './App';
  import React from 'react';
  import ReactDOM from 'react-dom';
  import { refreshToken } from './common/auth';
  
  ReactDOM.render(<App />, document.getElementById('root'));
  
  // If you want your app to work offline and load faster, you can change
  // unregister() to register() below. Note this comes with some pitfalls.
  // Learn more about service workers: http://bit.ly/CRA-PWA
  serviceWorker.unregister();
  
  // Check token and refresh if close to expiry.
  // Performed immediately and every 60 seconds thereafter.
  refreshToken();
  setInterval(refreshToken, 60 * 1000 /* one minute */);
  