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Editing: sw.js

var CACHE_NAME    = 'eizon-cache-v1';
var OFFLINE_URL   = '/offline';

// Pages and assets to pre-cache on install
var PRE_CACHE = [
    '/',
    '/offline',
    '/home',
    '/products',
];

// Install — pre-cache core pages
self.addEventListener('install', function (event) {
    event.waitUntil(
        caches.open(CACHE_NAME).then(function (cache) {
            return cache.addAll(PRE_CACHE);
        })
    );
    self.skipWaiting();
});

// Activate — clean up old caches
self.addEventListener('activate', function (event) {
    event.waitUntil(
        caches.keys().then(function (keys) {
            return Promise.all(
                keys.filter(function (key) {
                    return key !== CACHE_NAME;
                }).map(function (key) {
                    return caches.delete(key);
                })
            );
        })
    );
    self.clients.claim();
});

// Fetch — network first, fall back to cache
self.addEventListener('fetch', function (event) {
    // Only handle GET requests for your domain
    if (event.request.method !== 'GET') return;
    if (!event.request.url.includes('eizononline.com')) return;

event.respondWith(
        fetch(event.request)
            .then(function (networkResponse) {
                // Cache every successful page visit
                var responseClone = networkResponse.clone();
                caches.open(CACHE_NAME).then(function (cache) {
                    cache.put(event.request, responseClone);
                });
                return networkResponse;
            })
            .catch(function () {
                // Network failed — try cache
                return caches.match(event.request).then(function (cached) {
                    if (cached) return cached;
                    // Nothing cached for this page — show offline page
                    return caches.match(OFFLINE_URL);
                });
            })
    );
});

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