apocalypseHandler.js

window.addEventListener('error', async err => {
  // Since we are handling the error here, we must make
  // sure we log it into the console nonetheless, otherwise
  // it will be very difficult to understand why your app
  // is crashing.
  console.error(err);

  // If no service worker is available, our work ends here
  // because we don't need to unregister the service worker
  // to make sure the user is able to get a newer version of
  // our application.
  if (!navigator.serviceWorker) {
    return;
  }

  // On development builds of React, error boundaries don't stop
  // errors from bubbling up to the window error handler, so we don't
  // want to execute this code here because it would be unreliable
  // https://github.com/facebook/react/issues/12897#issuecomment-410036991
  if (process.env.NODE_ENV !== 'development') {
    // We want to run this code only if we detect a new service worker
    // is getting installed or is installed but waiting to be activated.
    // This will make sure we don't run this code on a sane environment
    // that is crashing for an error not related to stale app cache.
    const registration = await navigator.serviceWorker.ready;
    if (registration.installing || registration.waiting) {
      navigator.serviceWorker.ready.then(async registration => {
        await registration.unregister();
        // Once the service worker is unregistered, we can reload
        // the page to let the browser download a fresh copy of our app
        window.location.reload();
      });
    }
  }
});