https://sailingissues.com/pwabuilder-sw-register.js

1// This is the service worker with the combined offline experience (Offline page + Offline copy of pages)
2
3// Add this below content to your HTML page, or add the js file to your page at the very top to register service worker
4
5// Check compatibility for the browser we're running this in
6if ("serviceWorker" in navigator) {
7  if (navigator.serviceWorker.controller) {
8    console.log("[PWA Builder] active service worker found, no need to register");
9  } else {
10    // Register the service worker
11    navigator.serviceWorker
12      .register("/pwabuilder-sw.js", {
13        scope: "./"
14      })
15      .then(function (reg) {
16        console.log("[PWA Builder] Service worker has been registered for scope: " + reg.scope);
17      });
18  }
19}