sw.js

const cacheName = "solar-v1";
const assetsToCache = [
  "/",
  "/index.html",
  "/styles.css",
  "/script.js",
  "/manifest.json",
  "/icons/icon-192.png",
  "/icons/icon-512.png"
];

// Install event
self.addEventListener("install", event => {
  event.waitUntil(
    caches.open(cacheName).then(cache => {
      return cache.addAll(assetsToCache);
    })
  );
});

// Activate event
self.addEventListener("activate", event => {
  event.waitUntil(self.clients.claim());
});

// Fetch event
self.addEventListener("fetch", event => {
  event.respondWith(
    caches.match(event.request).then(response => {
      return response || fetch(event.request);
    })
  );
});