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- import { timestamp, files, shell, routes } from '@sapper/service-worker';
- const ASSETS = `cache${timestamp}`;
- // `shell` is an array of all the files generated by the bundler,
- // `files` is an array of everything in the `static` directory
- const to_cache = shell.concat(files);
- const cached = new Set(to_cache);
- self.addEventListener('install', event => {
- event.waitUntil(
- caches
- .open(ASSETS)
- .then(cache => cache.addAll(to_cache))
- .then(() => {
- self.skipWaiting();
- })
- );
- });
- self.addEventListener('activate', event => {
- event.waitUntil(
- caches.keys().then(async keys => {
- // delete old caches
- for (const key of keys) {
- if (key !== ASSETS) await caches.delete(key);
- }
- self.clients.claim();
- })
- );
- });
- self.addEventListener('fetch', event => {
- if (event.request.method !== 'GET' || event.request.headers.has('range')) return;
- const url = new URL(event.request.url);
- // don't try to handle e.g. data: URIs
- if (!url.protocol.startsWith('http')) return;
- // ignore dev server requests
- if (url.hostname === self.location.hostname && url.port !== self.location.port) return;
- // always serve static files and bundler-generated assets from cache
- if (url.host === self.location.host && cached.has(url.pathname)) {
- event.respondWith(caches.match(event.request));
- return;
- }
- // for pages, you might want to serve a shell `service-worker-index.html` file,
- // which Sapper has generated for you. It's not right for every
- // app, but if it's right for yours then uncomment this section
- /*
- if (url.origin === self.origin && routes.find(route => route.pattern.test(url.pathname))) {
- event.respondWith(caches.match('/service-worker-index.html'));
- return;
- }
- */
- if (event.request.cache === 'only-if-cached') return;
- // for everything else, try the network first, falling back to
- // cache if the user is offline. (If the pages never change, you
- // might prefer a cache-first approach to a network-first one.)
- event.respondWith(
- caches
- .open(`offline${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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