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sw.js
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sw.js
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const staticCacheName = 'static-cache-v13';
const dynamicCacheName = 'dynamic-cache-v13';
const staticAssets = [
'/',
'/index.html',
'/manifest.json',
'/images/icons/icon-128x128.png',
'/images/icons/icon-192x192.png',
'/style.css',
'/components/header/header.js',
'/components/menu/menu.js',
];
self.addEventListener('install', async e => {
const preCache = async () => {
await caches.keys().then((cacheNames) => {
return Promise.all(
cacheNames.filter((cacheName) => !([staticCacheName, dynamicCacheName].includes(cacheName))).map((cacheName) => caches.delete(cacheName))
);
});
const cache = await caches.open(staticCacheName);
return await cache.addAll(staticAssets);
};
e.waitUntil(preCache());
});
self.addEventListener('activate', async e => {
const cacheKeys = await caches.keys();
const checkKeys = cacheKeys.map(async key => {
if (staticCacheName !== key) {
await caches.delete(key);
}
})
await Promise.all(checkKeys);
});
self.addEventListener('fetch', e => {
e.respondWith(checkCache(e.request));
});
/**
* @param {Request} req
*/
async function checkCache(req) {
const url = new URL(req.url);
if (url.pathname === '/') {
req = new Request(`${url.origin}/`);
}
const cachedResponse = await caches.match(req);
const online = await checkOnline(req);
return online ?? cachedResponse;
}
async function checkOnline(req) {
const cache = await caches.open(dynamicCacheName);
try {
const res = await fetch(req);
await cache.put(req, res.clone());
return res;
} catch (err) {
return await cache.match(req);
}
}