breccia-mapper/breccia_mapper/static/js/serviceworker.js

var staticCacheName = "djangopwa-v1";

self.addEventListener("install", function (event) {
  event.waitUntil(
    caches.open(staticCacheName).then(function (cache) {
      return cache.addAll([""]);
    })
  );
});

self.addEventListener("fetch", function (event) {
  var requestUrl = new URL(event.request.url);
  if (requestUrl.origin === location.origin) {
    if (requestUrl.pathname === "/") {
      event.respondWith(caches.match(""));
      return;
    }
  }
  event.respondWith(
    caches.match(event.request).then(function (response) {
      return response || fetch(event.request);
    })
  );
});