docs/sw.js

const CACHE = 'snapkitty-sovereign-v1.1'
const CORE = ['/sovereign-emulator/', '/sovereign-emulator/index.html']

self.addEventListener('install', e => {
  self.skipWaiting()
  e.waitUntil(caches.open(CACHE).then(c => c.addAll(CORE).catch(() => {})))
})

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

self.addEventListener('fetch', e => {
  e.respondWith(
    caches.match(e.request).then(r => r || fetch(e.request).catch(() => caches.match('/sovereign-emulator/')))
  )
})