function registerValidSW()

in src/serviceWorker.js [73:112]

• 30 lines of code
• 7 McCabe index (conditional complexity)

function registerValidSW(swUrl, config) {
  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 updated precached content has been fetched,
                // but the previous service worker will still serve the older
                // content until all client tabs are closed.
                console.log(
                    'New content is available and will be used when all ' +
                                'tabs for this page are closed. See http://bit.ly/CRA-PWA.',
                );

                // Execute callback
                if (config && config.onUpdate) {
                  config.onUpdate(registration);
                }
              } 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.');

                // Execute callback
                if (config && config.onSuccess) {
                  config.onSuccess(registration);
                }
              }
            }
          };
        };
      })
      .catch((error) => {
        console.error('Error during service worker registration:', error);
      });
}