optimize

service-worker.js

@@ -0,0 +1,43 @@
+const CACHE_NAME = 'v1';
+const URLS_TO_CACHE = [
+    './',
+    './favicon.png',
+    './cursor.cur',
+    './index.js',
+    'https://unpkg.com/webamp/built/webamp.bundle.min.js',
+    'https://unpkg.com/butterchurn/lib/butterchurn.min.js',
+    'https://unpkg.com/butterchurn-presets/lib/butterchurnPresets.min.js',
+    'https://lastfm.freetls.fastly.net/'
+];
+
+self.addEventListener('install', function(event) {
+    event.waitUntil(
+        caches.open(CACHE_NAME)
+            .then(function(cache) {
+                return cache.addAll(URLS_TO_CACHE);
+            })
+    );
+});
+
+self.addEventListener('fetch', function(event) {
+    event.respondWith(
+        caches.match(event.request)
+            .then(function(response) {
+                return response || fetch(event.request);
+            })
+    );
+});
+
+self.addEventListener('activate', function(event) {
+    event.waitUntil(
+        caches.keys().then(function(cacheNames) {
+            return Promise.all(
+                cacheNames.map(function(cacheName) {
+                    if (cacheName !== CACHE_NAME) {
+                        return caches.delete(cacheName);
+                    }
+                })
+            );
+        })
+    );
+});