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sw.js
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sw.js
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const VERSION = 3
const CACHE_NAME = `CACHE-${VERSION}`
const CACHE_LIST = ['/assets/fonts/Nunito-Regular.woff2', '/assets/fonts/Nunito-Bold.woff2', '/assets/css/index.css', '/assets/img/favicon/favicon.svg', '/assets/img/favicon/google-touch-icon.png', '/page/404.html']
self.addEventListener('install', (ev) => {
ev.waitUntil(
caches.open(CACHE_NAME).then((cache) => { cache.addAll(CACHE_LIST) })
)
})
self.addEventListener('activate', (ev) => {
console.log('Activated')
ev.waitUntil(
caches.keys().then((keys) => { return Promise.all(keys.filter((key) => key != CACHE_NAME).map((nm) => caches.delete(nm))) })
)
})
self.addEventListener('fetch', (ev) => {
const isOnline = navigator.onLine
isOnline ? ev.respondWith(networkRevalidateAndCache(ev)) : ev.respondWith(cacheOnly(ev))
})
function cacheOnly(ev) {
// Return what is in the cache
return caches.match(ev.request);
}
async function cacheFirst(ev) {
try {
// Return from cache or fetch if not in cache
const CACHE_RESPONSE = await caches.match(ev.request)
// Return CACHE_RESPONSE if not null
return CACHE_RESPONSE || fetch(ev.request)
} catch (error) {
console.error("cacheFirst error:", error)
throw error
}
}
function networkOnly(ev) {
// Return fetch response
return fetch(ev.request);
}
async function networkFirst(ev) {
try {
// Try fetch and fallback on cache
const FETCH_RESPONSE = await fetch(ev.request)
if (FETCH_RESPONSE.ok) return FETCH_RESPONSE
return caches.match(ev.request)
} catch (error) {
console.error("networkFirst error:", error)
throw error
}
}
async function staleWhileRevalidate(ev) {
try {
// Check cache and fallback on fetch for response
// Always attempt to fetch a new copy and update the cache
const CACHE_RESPONSE = await caches.match(ev.request)
const FETCH_RESPONSE = await fetch(ev.request)
if (FETCH_RESPONSE.ok) {
const CACHE = await caches.open(CACHE_NAME)
CACHE.put(ev.request, FETCH_RESPONSE.clone())
return FETCH_RESPONSE
}
return CACHE_RESPONSE || FETCH_RESPONSE
} catch (error) {
console.error("staleWhileRevalidate error:", error)
throw error
}
}
async function networkRevalidateAndCache(ev) {
try {
// Try fetch first and fallback on cache
// Update cache if fetch was successful
const FETCH_RESPONSE = await fetch(ev.request, { mode: 'cors', credentials: 'omit' })
if (FETCH_RESPONSE.ok) {
const CACHE = await caches.open(CACHE_NAME)
CACHE.put(ev.request, FETCH_RESPONSE.clone())
return FETCH_RESPONSE
}
return caches.match(ev.request)
} catch (error) {
console.error("networkRevalidateAndCache error:", error)
throw error
}
}