function checkValidServiceWorker()

in src/serviceWorker.js [114:139]

• 22 lines of code
• 3 McCabe index (conditional complexity)

function checkValidServiceWorker(swUrl, config) {
  // Check if the service worker can be found. If it can't reload the page.
  fetch(swUrl)
      .then((response) => {
        // Ensure service worker exists, and that we really are getting a JS file.
        if (
          response.status === 404 ||
                response.headers.get('content-type').indexOf('javascript') === -1
        ) {
          // No service worker found. Probably a different app. Reload the page.
          navigator.serviceWorker.ready.then((registration) => {
            registration.unregister().then(() => {
              window.location.reload();
            });
          });
        } else {
          // Service worker found. Proceed as normal.
          registerValidSW(swUrl, config);
        }
      })
      .catch(() => {
        console.log(
            'No internet connection found. App is running in offline mode.',
        );
      });
}