service-worker.js

const cacheName = 'chatbot-cache-v1';
const assetsToCache = [
  '/',
  '/index.html',
  '/styles.css',
  '/script.js',
  '/icon_vera.png',
  '/icon_vera2.png',
  '/manifest.json',
  '/login.html',
  '/login.png',
  '/mic.png',
  '/newchat.png',
  '/register.html'
  '/styles1.css'
];

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

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