feat(kanban): restore commands offline

req: local/001\nreq: local/002\nreq: local/003\nreq: local/004

examples/kanban/static/offline.js

@@ -0,0 +1,30 @@
+const CACHE = "hemx-kanban-shell-v1";
+const SHELL = [
+  "/",
+  "/hemx.js",
+  "/hemx.client.js",
+  "/kanban_client.js",
+  "/kanban_client_bg.wasm",
+  "/app.js",
+];
+
+self.addEventListener("install", (event) => {
+  event.waitUntil(caches.open(CACHE).then((cache) => cache.addAll(SHELL)).then(() => self.skipWaiting()));
+});
+
+self.addEventListener("activate", (event) => {
+  event.waitUntil(
+    caches.keys()
+      .then((names) => Promise.all(names.filter((name) => name.startsWith("hemx-kanban-shell-") && name !== CACHE).map((name) => caches.delete(name))))
+      .then(() => self.clients.claim()),
+  );
+});
+
+self.addEventListener("fetch", (event) => {
+  if (event.request.method !== "GET") return;
+  const url = new URL(event.request.url);
+  if (url.origin !== self.location.origin || !SHELL.includes(url.pathname)) return;
+  event.respondWith(
+    caches.match(event.request, { ignoreSearch: true }).then((cached) => cached || fetch(event.request)),
+  );
+});