demo: Support empty entry JS in build mode.

examples/rust-vite/vite-remote/src/main.jsx

@@ -1,11 +0,0 @@
-import React from 'react';
-import ReactDOM from 'react-dom/client';
-import App from './App';
-
-//@ts-ignore
-const root = ReactDOM.createRoot(document.getElementById('app'));
-root.render(
-  <React.StrictMode>
-    <App />
-  </React.StrictMode>
-);

package.json

@@ -17,6 +17,7 @@
     "dev": "microbundle watch --no-sourcemap --compress=false",
     "build": "rimraf lib && microbundle --no-sourcemap --compress=false",
     "dev-rv": "pnpm -filter 'examples-rust-vite*' run dev",
+    "preview-rv": "pnpm -filter 'examples-rust-vite*' run preview",
     "dev-vv": "pnpm -filter 'examples-vite-vite*' run dev",
     "dev-nv": "pnpm -filter 'examples-nuxt-vite-host' -filter 'examples-vite-vite-remote' run dev",
     "preview-vv": "pnpm -filter 'examples-vite-vite*'  run preview",