register valid service worker

registerValidSW.js

function registerValidSW(swUrl) {
    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.
                            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 => {
            console.error('Error during service worker registration:', error);
        });
}