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if ("serviceWorker" in navigator) { navigator.serviceWorker .register("/worker.js") .then(function (registration) { registration.addEventListener("updatefound", function () { // If updatefound is fired, it means that there's // a new service worker being installed. var installingWorker = registration.installing; console.log( "A new service worker is being installed:", installingWorker, ); // You can listen for changes to the installing service worker's // state via installingWorker.onstatechange }); }) .catch(function (error) { console.log("Service worker registration failed:", error); }); } else { console.log("Service workers are not supported."); }