sw.js

const cacheName = "25foods"; // Change value to force update

self.addEventListener("install", event => {
	// Kick out the old service worker
	self.skipWaiting();

	event.waitUntil(
		caches.open(cacheName).then(cache => {
			return cache.addAll([
				"/",
				"favicon.ico", // Favicon, IE and fallback for other browsers
        "https://www.25foods.com",
			
				"https://cdn.jsdelivr.net/gh/go69/icon@svg/25-foods-96.png", // Logo
        "https://cdn.jsdelivr.net/gh/go69/icon@svg/25-foods-512.png", // Logo
        				
				"https://cdn.jsdelivr.net/gh/go69/icon@svg/manifest.webmanifest" // Manifest file
				
			]);
		})
	);
});

self.addEventListener("activate", event => {
	// Delete any non-current cache
	event.waitUntil(
		caches.keys().then(keys => {
			Promise.all(
				keys.map(key => {
					if (![cacheName].includes(key)) {
						return caches.delete(key);
					}
				})
			)
		})
	);
});

// Offline-first, cache-first strategy
// Kick off two asynchronous requests, one to the cache and one to the network
// If there's a cached version available, use it, but fetch an update for next time.
// Gets data on screen as quickly as possible, then updates once the network has returned the latest data. 
self.addEventListener("fetch", event => {
	event.respondWith(
		caches.open(cacheName).then(cache => {
			return cache.match(event.request).then(response => {
				return response || fetch(event.request).then(networkResponse => {
					cache.put(event.request, networkResponse.clone());
					return networkResponse;
				});
			})
		})
	);
});