I'd like to show my user that an update is available. Therefore I need to know how to check if he already uses the latest version.

Currently I set an item in localStorage called "updateAvailable" as soon as the serviceWorker tells me that there is a new version available. That works fine.

What doesn't work fine although is when I'd like to set "updateAvailable" to false. The item isn't set in localStorage.

How do I set this item in localStorage when the latest version of my PWA is used?

function registerValidSW(swUrl: string, config?: Config) {
  console.log("test 5")
  navigator.serviceWorker
    .register(swUrl)
    .then(registration => {
      registration.onupdatefound = () => {
        const installingWorker = registration.installing;
        if (installingWorker == null) {
          return;
        }
        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 [hidden link]'
              );
              localStorage.setItem("updateAvailable", "true")

              // 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.');
              localStorage.setItem("updateAvailable", "false")

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