WIP: Begin unified map refactor - HTML structure, storage, CSS, state updates

.tmp/imgdiff/new/sw.js

@@ -0,0 +1,19 @@
+'use strict';
+
+// Disable offline caching so UI updates are always immediate.
+self.addEventListener('install', event => {
+  event.waitUntil(self.skipWaiting());
+});
+
+self.addEventListener('activate', event => {
+  event.waitUntil((async () => {
+    const keys = await caches.keys();
+    await Promise.all(keys.map(k => caches.delete(k)));
+    await self.clients.claim();
+    await self.registration.unregister();
+  })());
+});
+
+self.addEventListener('fetch', () => {
+  // Intentionally no fetch interception.
+});