A component to register a service worker

OfflineSupport.js

import React from 'react';
class OfflineSupport extends React.PureComponent {
 componentDidMount() {
  if ('serviceWorker' in navigator) {
   navigator.serviceWorker
   .register('/sw.js')
   .then(() => console.log('service worker registered.'))
   .catch(err => console.dir(err));
   }
  }
  render() {
   return null;
  }
 }
export default OfflineSupport;