const CACHE = "kanjin-v1";
const PRECACHE = ["/", "/static/manifest.json"];

self.addEventListener("install", (e) => {
    e.waitUntil(
        caches.open(CACHE).then((c) => c.addAll(PRECACHE)).then(() => self.skipWaiting())
    );
});

self.addEventListener("activate", (e) => {
    e.waitUntil(
        caches.keys().then((keys) =>
            Promise.all(keys.filter((k) => k !== CACHE).map((k) => caches.delete(k)))
        ).then(() => self.clients.claim())
    );
});

self.addEventListener("fetch", (e) => {
    e.respondWith(
        caches.match(e.request).then((r) => r || fetch(e.request))
    );
});