prelöoad experiment

scripts/dev.mjs

@@ -0,0 +1,45 @@
+/**
+ * Dev with full PWA precache: production build --watch + preview.
+ * Vite HMR cannot precache in-memory modules; use npm run dev:hmr for that.
+ */
+import { build, preview } from 'vite';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+const root = path.dirname(fileURLToPath(import.meta.url));
+const configFile = path.resolve(root, '../vite.config.js');
+
+const watcher = await build({
+  configFile,
+  build: { watch: {} },
+});
+
+let previewServer;
+
+async function startPreview() {
+  if (previewServer) return;
+  previewServer = await preview({
+    configFile,
+    preview: { host: true },
+  });
+  previewServer.printUrls();
+  previewServer.bindCLIShortcuts({ print: true });
+}
+
+watcher.on('event', (event) => {
+  if (event.code === 'BUNDLE_END') {
+    void startPreview();
+  }
+  if (event.code === 'ERROR') {
+    console.error(event.error);
+  }
+});
+
+async function shutdown() {
+  await previewServer?.close();
+  await watcher.close();
+  process.exit(0);
+}
+
+process.on('SIGINT', shutdown);
+process.on('SIGTERM', shutdown);