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feat: PWA support, now this app is installable
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,92 @@ | ||
| import { timestamp, files, build } from '$service-worker'; | ||
|
|
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| const _files = files.filter((o) => !o.includes('.DS_Store')); | ||
| const ASSETS = `cache${timestamp}`; | ||
|
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||
| // `build` is an array of all the files generated by the bundler, | ||
| // `files` is an array of everything in the `static` directory | ||
| const to_cache = (build as string[]).concat(_files as string[]); | ||
| const staticAssets = new Set(to_cache); | ||
|
|
||
| self.addEventListener('install', (event: ExtendableEvent) => { | ||
| event.waitUntil( | ||
| caches | ||
| .open(ASSETS) | ||
| .then((cache) => | ||
| cache | ||
| .addAll(to_cache) | ||
| .then() | ||
| .catch((e) => console.warn(e)) | ||
| ) | ||
| .then(() => { | ||
| (self as never as ServiceWorkerGlobalScope).skipWaiting(); | ||
| }) | ||
| ); | ||
| }); | ||
|
|
||
| self.addEventListener('activate', (event: ExtendableEvent) => { | ||
| event.waitUntil( | ||
| caches.keys().then(async (keys) => { | ||
| // delete old caches | ||
| for (const key of keys) { | ||
| if (key !== ASSETS) await caches.delete(key); | ||
| } | ||
|
|
||
| (self as never as ServiceWorkerGlobalScope).clients.claim(); | ||
| }) | ||
| ); | ||
| }); | ||
|
|
||
| /** | ||
| * Fetch the asset from the network and store it in the cache. | ||
| * Fall back to the cache if the user is offline. | ||
| */ | ||
| async function fetchAndCache(request: Request) { | ||
| const cache = await caches.open(`offline${timestamp}`); | ||
|
|
||
| try { | ||
| const response = await fetch(request); | ||
| cache.put(request, response.clone()); | ||
| return response; | ||
| } catch (err) { | ||
| const response = await cache.match(request); | ||
| if (response) return response; | ||
|
|
||
| throw err; | ||
| } | ||
| } | ||
|
|
||
| self.addEventListener('fetch', (event: FetchEvent) => { | ||
| if (event.request.method !== 'GET' || event.request.headers.has('range')) return; | ||
|
|
||
| const url = new URL(event.request.url); | ||
|
|
||
| // don't try to handle e.g. data: URIs | ||
| const isHttp = url.protocol.startsWith('http'); | ||
| const isDevServerRequest = | ||
| url.hostname === self.location.hostname && url.port !== self.location.port; | ||
| const isStaticAsset = url.host === self.location.host && staticAssets.has(url.pathname); | ||
| const skipBecauseUncached = event.request.cache === 'only-if-cached' && !isStaticAsset; | ||
|
|
||
| if (isHttp && !isDevServerRequest && !skipBecauseUncached) { | ||
| event.respondWith( | ||
| (async () => { | ||
| // always serve static files and bundler-generated assets from cache. | ||
| // if your application has other URLs with data that will never change, | ||
| // set this variable to true for them and they will only be fetched once. | ||
| const cachedAsset = isStaticAsset && (await caches.match(event.request)); | ||
|
|
||
| // for pages, you might want to serve a shell `service-worker-index.html` file, | ||
| // which Sapper has generated for you. It's not right for every | ||
| // app, but if it's right for yours then uncomment this section | ||
| /* | ||
| if (!cachedAsset && url.origin === self.origin && routes.find(route => route.pattern.test(url.pathname))) { | ||
| return caches.match('/service-worker-index.html'); | ||
| } | ||
| */ | ||
|
|
||
| return cachedAsset || fetchAndCache(event.request); | ||
| })() | ||
| ); | ||
| } | ||
| }); |
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