chore: remove strategies dir; add sample sw

packages/astro-sw/package.json

@@ -9,8 +9,7 @@
   },
   "exports": {
     ".": "./astro-sw.js",
-    "./globals": "./globals.js",
-    "./strategies/*": "./strategies/*"
+    "./globals": "./globals.js"
   },
   "files": [
     "astro-sw.js",

packages/astro-sw/strategies/stale-while-revalidate.js

@@ -1 +0,0 @@
-export default () => 'hello world!'

sample-sw.js

@@ -0,0 +1,125 @@
+/**
+ * Note: @ayco/astro-sw integration injects variables `__prefix`, `__version`, & `__assets`
+ * -- find usage in `astro.config.mjs` integrations
+ * @see https://ayco.io/n/@ayco/astro-sw
+ */
+const cacheName = `${__prefix ?? 'app'}-v${__version ?? '000'}`
+
+const cleanOldCaches = async () => {
+  const allowCacheNames = ['cozy-reader', cacheName]
+  const allCaches = await caches.keys()
+  allCaches.forEach((key) => {
+    if (!allowCacheNames.includes(key)) {
+      console.info('Deleting old cache', key)
+      caches.delete(key)
+    }
+  })
+}
+
+const addResourcesToCache = async (resources) => {
+  const cache = await caches.open(cacheName)
+  console.info('adding resources to cache...', resources)
+  try {
+    await cache.addAll(resources)
+  } catch (error) {
+    console.error(
+      'failed to add resources to cache; make sure requests exists and that there are no duplicates',
+      {
+        resources,
+        error,
+      }
+    )
+  }
+}
+
+const putInCache = async (request, response) => {
+  const cache = await caches.open(cacheName)
+
+  if (response.ok) {
+    console.info('adding one response to cache...', request.url)
+
+    // if exists, replace
+    cache.keys().then((keys) => {
+      if (keys.includes(request)) {
+        cache.delete(request)
+      }
+    })
+
+    cache.put(request, response)
+  }
+}
+
+const cacheAndRevalidate = async ({ request, fallbackUrl }) => {
+  const cache = await caches.open(cacheName)
+
+  // Try get the resource from the cache
+  const responseFromCache = await cache.match(request)
+  if (responseFromCache) {
+    console.info('using cached response...', responseFromCache.url)
+    // get network response for revalidation of cached assets
+    fetch(request.clone())
+      .then((responseFromNetwork) => {
+        if (responseFromNetwork) {
+          console.info('fetched updated resource...', responseFromNetwork.url)
+          putInCache(request, responseFromNetwork.clone())
+        }
+      })
+      .catch((error) => {
+        console.info('failed to fetch updated resource', error)
+      })
+
+    return responseFromCache
+  }
+
+  try {
+    // Try to get the resource from the network for 5 seconds
+    const responseFromNetwork = await fetch(request.clone())
+    // response may be used only once
+    // we need to save clone to put one copy in cache
+    // and serve second one
+    putInCache(request, responseFromNetwork.clone())
+    console.info('using network response', responseFromNetwork.url)
+    return responseFromNetwork
+
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars
+  } catch (error) {
+    // Try the fallback
+    const fallbackResponse = await cache.match(fallbackUrl)
+    if (fallbackResponse) {
+      console.info('using fallback cached response...', fallbackResponse.url)
+      return fallbackResponse
+    }
+
+    // when even the fallback response is not available,
+    // there is nothing we can do, but we must always
+    // return a Response object
+    return new Response('Network error happened', {
+      status: 408,
+      headers: { 'Content-Type': 'text/plain' },
+    })
+  }
+}
+
+// eslint-disable-next-line @typescript-eslint/no-unused-vars
+self.addEventListener('activate', (event) => {
+  console.info('activating service worker...')
+  cleanOldCaches()
+})
+
+self.addEventListener('install', (event) => {
+  console.info('installing service worker...')
+  self.skipWaiting() // go straight to activate
+
+  event.waitUntil(addResourcesToCache(__assets ?? []))
+})
+
+self.addEventListener('fetch', (event) => {
+  console.info('fetch happened', { data: event })
+
+  event.respondWith(
+    cacheAndRevalidate({
+      request: event.request,
+      fallbackUrl: './',
+    })
+  )
+})