https://www.landsiedel-seminare.de/include/js/swCacher.js

1// Client-Side Caching using Service Worker and Browser-Cache-API
2
3const cacheVersion = "v0.3";
4const cacheAssets = [
5   '/css/css-coaching-welt-neuer-Header.css'
6]
7
8// Call Install Event
9self.addEventListener('install', (e) => {
10    console.log("SW: Installed");
11    e.waitUntil(
12        caches
13            .open(cacheVersion)
14            .then(cache => {
15                console.log("Service Worker: Caching Files");
16            cache.addAll(cacheAssets);
17            })
18            .then(() => self.skipWaiting())
19    );
20}, false);
21
22// Call Activate Event
23self.addEventListener('activate', (e) => {
24    console.log("SW: Activated");
25    // Remove old Cache Versions, if a newer one is available
26    e.waitUntil(
27        caches.keys().then(cacheNames => {
28            return Promise.all(
29                cacheNames.map(cache => {
30                    if (cache !== cacheVersion) {
31                        console.log("Service Worker: Old Cache deleted");
32                        return caches.delete(cache);
33                    }
34                })
35            )
36        })
37    );
38}, false);