97 lines
2.8 KiB
JavaScript
97 lines
2.8 KiB
JavaScript
const timestamp = '__timestamp__'
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const ASSETS = `assets_${timestamp}`
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const WEBPACK_ASSETS = `webpack_assets_${timestamp}`
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// `assets` is an array of everything in the `assets` directory
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const assets = __assets__
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.map(file => file.startsWith('/') ? file : `/${file}`)
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.filter(filename => !filename.startsWith('/apple-icon'))
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.concat(['/index.html'])
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// `shell` is an array of all the files generated by webpack
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// also contains '/index.html' for some reason
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const webpackAssets = __shell__
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.filter(filename => !filename.endsWith('.map'))
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.filter(filename => filename !== '/index.html')
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// `routes` is an array of `{ pattern: RegExp }` objects that
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// match the pages in your app
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const routes = __routes__
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self.addEventListener('install', event => {
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event.waitUntil((async () => {
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await Promise.all([
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caches.open(WEBPACK_ASSETS).then(cache => cache.addAll(webpackAssets)),
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caches.open(ASSETS).then(cache => cache.addAll(assets))
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])
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self.skipWaiting()
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})())
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})
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self.addEventListener('activate', event => {
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event.waitUntil((async () => {
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let keys = await caches.keys()
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// delete old asset/ondemand caches
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for (let key of keys) {
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if (key !== ASSETS &&
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!key.startsWith('webpack_assets_')) {
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await caches.delete(key)
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}
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}
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// for webpack assets, keep the two latest builds because we may need
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// them when the service worker has installed but the page has not
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// yet reloaded (e.g. when it gives the toast saying "please reload"
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// but then you don't refresh and instead load an async chunk)
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let webpackKeysToDelete = keys
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.filter(key => key.startsWith('webpack_assets_'))
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.sort((a, b) => {
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let aTimestamp = parseInt(a.substring(15), 10)
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let bTimestamp = parseInt(b.substring(15), 10)
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return bTimestamp < aTimestamp ? -1 : 1
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})
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.slice(2)
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for (let key of webpackKeysToDelete) {
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await caches.delete(key)
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}
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await self.clients.claim()
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})())
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})
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self.addEventListener('fetch', event => {
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const req = event.request
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const url = new URL(req.url)
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// don't try to handle e.g. data: URIs
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if (!url.protocol.startsWith('http')) {
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return
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}
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event.respondWith((async () => {
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let sameOrigin = url.origin === self.origin
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if (sameOrigin) {
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// always serve webpack-generated resources and
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// assets from the cache if possible
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let response = await caches.match(req)
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if (response) {
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return response
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}
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// for routes, serve the /index.html file from the most recent
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// assets cache
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if (routes.find(route => route.pattern.test(url.pathname))) {
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let response = await caches.match('/index.html')
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if (response) {
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return response
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}
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}
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}
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// for everything else, go network-only
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return fetch(req)
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})())
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})
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