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- /* eslint-disable no-restricted-globals,@typescript-eslint/no-explicit-any */
- // @ts-ignore -- generated package
- import { timestamp, files, shell } from "@sapper/service-worker";
- const ASSETS = `cache${timestamp}`;
- // `shell` is an array of all the files generated by the bundler,
- // `files` is an array of everything in the `static` directory
- const toCache = (shell as string[]).concat(files as string[]);
- const cached = new Set(toCache);
- self.addEventListener("install", <EventType extends ExtendableEvent>(event: EventType) => {
- event.waitUntil(
- caches
- .open(ASSETS)
- .then((cache) => cache.addAll(toCache))
- .then(() => {
- (self as any as ServiceWorkerGlobalScope).skipWaiting();
- }),
- );
- });
- self.addEventListener("activate", <EventType extends ExtendableEvent>(event: EventType) => {
- event.waitUntil(
- caches.keys().then(async (keys) => {
- // delete old caches
- for (const key of keys) { // eslint-disable-line no-restricted-syntax
- if (key !== ASSETS) {
- // eslint-disable-next-line no-await-in-loop
- await caches.delete(key);
- }
- }
- (self as any as {clients: Clients}).clients.claim();
- }),
- );
- });
- self.addEventListener("fetch", <EventType extends FetchEvent>(event: EventType) => {
- if (event.request.method !== "GET" || event.request.headers.has("range")) return;
- const url = new URL(event.request.url);
- // don't try to handle e.g. data: URIs
- if (!url.protocol.startsWith("http")) return;
- // ignore dev server requests
- if (url.hostname === self.location.hostname && url.port !== self.location.port) return;
- // always serve static files and bundler-generated assets from cache
- if (url.host === self.location.host && cached.has(url.pathname)) {
- caches.match(event.request).then((match): void => {
- if (match) event.respondWith(match);
- });
- return;
- }
- // for pages, you might want to serve a shell `service-worker-index.html` file,
- // which Sapper has generated for you. It's not right for every
- // app, but if it's right for yours then uncomment this section
- /*
- if (url.origin === self.origin && routes.find(route => route.pattern.test(url.pathname))) {
- event.respondWith(caches.match('/service-worker-index.html'));
- return;
- }
- */
- if (event.request.cache === "only-if-cached") return;
- // for everything else, try the network first, falling back to
- // cache if the user is offline. (If the pages never change, you
- // might prefer a cache-first approach to a network-first one.)
- event.respondWith(
- caches
- .open(`offline${timestamp}`)
- .then(async (cache) => {
- try {
- const response = await fetch(event.request);
- cache.put(event.request, response.clone());
- return response;
- } catch (err) {
- const response = await cache.match(event.request);
- if (response) return response;
- throw err;
- }
- }),
- );
- });
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