sw.js - master - mubarak/MB

const CACHE_NAME = 'mubaraka-v21';
const urlsToCache = [
    '/',
    'index.html',
    'app.js',
    'manifest.json'
];

self.addEventListener('install', event => {
    event.waitUntil(
        caches.open(CACHE_NAME).then(cache => {
            return cache.addAll(urlsToCache);
        })
    );
    self.skipWaiting();
});

self.addEventListener('activate', event => {
    event.waitUntil(
        caches.keys().then(cacheNames => {
            return Promise.all(
                cacheNames.filter(name => name !== CACHE_NAME).map(name => caches.delete(name))
            );
        })
    );
    self.clients.claim();
});

self.addEventListener('fetch', event => {
    event.respondWith(
        caches.match(event.request).then(response => {
            return response || fetch(event.request).then(fetchResponse => {
                if (fetchResponse && fetchResponse.status === 200) {
                    const responseClone = fetchResponse.clone();
                    caches.open(CACHE_NAME).then(cache => {
                        cache.put(event.request, responseClone);
                    });
                }
                return fetchResponse;
            }).catch(() => {
                return caches.match(event.request);
            });
        })
    );
});