sw.js

const CACHE_NAME = 'textarea-2026-01-07'
const ASSETS = [
  '/',
  '/qr',
]

self.addEventListener('install', (event) => {
  event.waitUntil(
    caches.open(CACHE_NAME)
      .then((cache) => cache.addAll(ASSETS))
      .then(() => self.skipWaiting())
  )
})

self.addEventListener('activate', (event) => {
  event.waitUntil(
    caches.keys().then((cacheNames) => {
      return Promise.all(
        cacheNames.map((cacheName) => {
          if (cacheName !== CACHE_NAME) {
            return caches.delete(cacheName)
          }
        })
      )
    }).then(() => self.clients.claim())
  )
})

self.addEventListener('fetch', (event) => {
  event.respondWith(
    caches.match(event.request)
      .then((response) => {
        return response || fetch(event.request)
      })
  )
})