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

var staticCacheName = "django-pwa-v" + new Date().getTime();
var filesToCache = [
  "/offline",
  "https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.2.1/css/fontawesome.min.css",
  "https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.2.1/css/solid.min.css",
  "/static/css/global.css",
  "/static/hijack/hijack.min.css",
  "/media/icon-192x192.png",
];

// Cache on install
self.addEventListener("install", event => {
    this.skipWaiting();
    event.waitUntil(
        caches.open(staticCacheName)
            .then(cache => {
                return cache.addAll(filesToCache);
            })
    )
});

// Clear cache on activate
self.addEventListener('activate', event => {
    event.waitUntil(
        caches.keys().then(cacheNames => {
            return Promise.all(
                cacheNames
                    .filter(cacheName => (cacheName.startsWith("django-pwa-")))
                    .filter(cacheName => (cacheName !== staticCacheName))
                    .map(cacheName => caches.delete(cacheName))
            );
        })
    );
});

// Serve from Cache
self.addEventListener("fetch", event => {
    event.respondWith(
        caches.match(event.request)
            .then(response => {
                return response || fetch(event.request);
            })
            .catch(() => {
                return caches.match('offline');
            })
    )
});