badminton-scoreboard/public/sw.js

const CACHE_NAME = 'badminton-scoreboard-v1'
const APP_SHELL = [
  '/',
  '/index.html',
  '/manifest.webmanifest',
  '/favicon.png',
  '/icon.png',
  '/apple-touch-icon.png',
  '/pwa-192.png',
  '/pwa-512.png',
]

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

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

          return Promise.resolve(false)
        }),
      ),
    ),
  )
  self.clients.claim()
})

self.addEventListener('message', (event) => {
  if (event.data?.type === 'SKIP_WAITING') {
    self.skipWaiting()
  }
})

self.addEventListener('fetch', (event) => {
  if (event.request.method !== 'GET') {
    return
  }

  const requestUrl = new URL(event.request.url)

  if (requestUrl.origin !== self.location.origin) {
    return
  }

  event.respondWith(
    caches.match(event.request).then(async (cachedResponse) => {
      if (cachedResponse) {
        return cachedResponse
      }

      try {
        const networkResponse = await fetch(event.request)

        if (
          networkResponse.ok &&
          (event.request.destination === 'document' ||
            event.request.destination === 'script' ||
            event.request.destination === 'style' ||
            event.request.destination === 'image' ||
            requestUrl.pathname.startsWith('/assets/'))
        ) {
          const cache = await caches.open(CACHE_NAME)
          cache.put(event.request, networkResponse.clone())
        }

        return networkResponse
      } catch (error) {
        if (event.request.mode === 'navigate') {
          const fallback = await caches.match('/index.html')
          if (fallback) {
            return fallback
          }
        }

        throw error
      }
    }),
  )
})