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// https://googlechrome.github.io/samples/service-worker/basic/
const PRECACHE = "appname-precache-v1";
const RUNTIME = "appname-runtime";
const PRECACHE_URLS = [
"./", // Alias for index.html
"index.html",
"style.css",
"main.js"
];
self.addEventListener("install", e => e.waitUntil(
caches.open(PRECACHE)
.then(cache => cache.addAll(PRECACHE_URLS))
.then(self.skipWaiting())));
self.addEventListener("activate", e => {
const currentCaches = [PRECACHE, RUNTIME];
e.waitUntil( // Clean up old caches
caches.keys().then(cacheNames =>
cacheNames.filter(cacheName => !currentCaches.includes(cacheName))
).then(cachesToDelete => Promise.all(cachesToDelete.map(cacheToDelete =>
caches.delete(cacheToDelete)))
).then(() => self.clients.claim())
);
});
self.addEventListener("fetch", e => {
if (e.request.url.startsWith(self.location.origin)) {
e.respondWith(caches.match(e.request).then(cachedResponse =>
cachedResponse? cachedResponse
: caches.open(RUNTIME).then(cache =>
fetch(e.request).then(res =>
cache.put(e.request, res.clone()).then(() => res)
)
)
));
}
});
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