Start working on gui

unshell-gui/assets/sw.js

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+var cacheName = "egui-template-pwa";
+var filesToCache = [
+  "./",
+  "./index.html",
+  "./eframe_template.js",
+  "./eframe_template_bg.wasm",
+];
+
+/* Start the service worker and cache all of the app's content */
+self.addEventListener("install", function (e) {
+  e.waitUntil(
+    caches.open(cacheName).then(function (cache) {
+      return cache.addAll(filesToCache);
+    }),
+  );
+});
+
+/* Serve cached content when offline */
+self.addEventListener("fetch", function (e) {
+  e.respondWith(
+    caches.match(e.request).then(function (response) {
+      return response || fetch(e.request);
+    }),
+  );
+});