MineXLauncher/public/service-worker.js

const CACHE_NAME = 'minexlauncher-v1.3';
const urlsToCache = ['/offline.html', '/resources/images/icons/favicon.png', '/resources/styles/default.css'];

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

self.addEventListener('fetch', (event) => {
	event.respondWith(
		caches.match(event.request).then((response) => {
			if (response) {
				return response;
			}
			return fetch(event.request).then((response) => {
				if (!response || response.status !== 200 || response.type !== 'basic') {
					return response;
				}
				const responseToCache = response.clone();
				caches.open(CACHE_NAME).then((cache) => {
					cache.put(event.request, responseToCache);
				});
				return response;
			});
		})
	);
});

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