ServiceWorker update banner & cache

registerServiceWorker.js

import { toast } from 'react-toastify';

// In production, we register a service worker to serve assets from local cache.

// This lets the app load faster on subsequent visits in production, and gives
// it offline capabilities. However, it also means that developers (and users)
// will only see deployed updates on the "N+1" visit to a page, since previously
// cached resources are updated in the background.

// To learn more about the benefits of this model, read https://goo.gl/KwvDNy.
// This link also includes instructions on opting out of this behavior.

export default function register() {
  if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) {
    window.addEventListener('load', () => {
      const swUrl = `${process.env.PUBLIC_URL}/service-worker.js`;
      navigator.serviceWorker
        .register(swUrl)
        .then(registration => {
          registration.onupdatefound = () => {
            const installingWorker = registration.installing;
            installingWorker.onstatechange = () => {
              if (installingWorker.state === 'installed') {
                if (navigator.serviceWorker.controller) {
                  // At this point, the old content will have been purged and
                  // the fresh content will have been added to the cache.
                  // It's the perfect time to display a "New content is
                  // available; please refresh." message in your web app.
                  toast('We’ve made some changes to Screen Hunt since the last time you were here. Click this notification to refresh and get the best experience 😎️', {
                    autoClose: false,
                    hideProgressBar: true,
                    closeOnClick: true,
                    className: 'info-toast',
                    onClose: () => { window.location.reload() }
                  });
                  console.log('New content is available; please refresh.');
                } else {
                  // At this point, everything has been precached.
                  // It's the perfect time to display a
                  // "Content is cached for offline use." message.
                  console.log('Content is cached for offline use.');
                }
              }
            };
          };
        })
        .catch(error => {
          toast(`Error during service worker registration.`, {
            className: 'error-toast'
          });
          console.error('Error during service worker registration:', error);
        });
    });
  }
}

export function unregister() {
  if ('serviceWorker' in navigator) {
    navigator.serviceWorker.ready.then(registration => {
      registration.unregister();
    });
  }
}