sw.js

const CACHE_NAME = 'presiden-indo-v1';
const STATIC_ASSETS = ['./', './index.html', './style.css', './script.js'];

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

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

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