Initial commit

public/service-worker.js

@@ -0,0 +1,60 @@
+const CACHE_NAME = 'workout-runner-cache-v1.2'; 
+
+const urlsToCache = [
+    '/',
+    '/index.html',
+    '/style.css',
+    '/app.js',
+    '/manifest.json',
+    '/idb.umd.js',
+    '/icons/icon-192x192.png',
+    '/icons/icon-512x512.png',
+];
+
+self.addEventListener('install', event => {
+    self.skipWaiting(); 
+    
+    event.waitUntil(
+        caches.open(CACHE_NAME)
+            .then(cache => {
+                console.log('Opened cache and caching app shell');
+                return cache.addAll(urlsToCache);
+            })
+    );
+});
+
+self.addEventListener('activate', event => {
+    event.waitUntil(
+        caches.keys().then(cacheNames => {
+            return Promise.all(
+                cacheNames.map(cacheName => {
+                    if (cacheName !== CACHE_NAME) {
+                        console.log('Deleting old cache:', cacheName);
+                        return caches.delete(cacheName);
+                    }
+                })
+            );
+        }).then(() => {
+            return self.clients.claim();
+        })
+    );
+});
+
+self.addEventListener('fetch', event => {
+    if (event.request.method !== 'GET') {
+        return;
+    }
+
+    event.respondWith(
+        fetch(event.request)
+            .then(networkResponse => {
+                return caches.open(CACHE_NAME).then(cache => {
+                    cache.put(event.request, networkResponse.clone());
+                    return networkResponse;
+                });
+            })
+            .catch(() => {
+                return caches.match(event.request);
+            })
+    );
+});