test(react): bundled-dev playground (#1268)

Author: sapphi-red

playground/bundled-dev/__tests__/bundled-dev.spec.ts

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+import { expect, test } from 'vitest'
+import { editFile, isServe, page } from '~utils'
+
+test('should render', async () => {
+  // In bundled dev mode, the page initially shows a "Bundling in progress"
+  // placeholder and reloads once the bundle is ready.
+  await expect.poll(() => page.textContent('h1')).toMatch('Hello Vite + React')
+})
+
+test('should update', async () => {
+  expect(await page.textContent('#state-button')).toMatch('count is: 0')
+  await page.click('#state-button')
+  expect(await page.textContent('#state-button')).toMatch('count is: 1')
+})
+
+test.runIf(isServe)('should hmr', async () => {
+  editFile('src/App.tsx', (code) =>
+    code.replace('Vite + React', 'Vite + React Updated'),
+  )
+  await expect
+    .poll(() => page.textContent('h1'))
+    .toMatch('Hello Vite + React Updated')
+  // preserve state
+  expect(await page.textContent('#state-button')).toMatch('count is: 1')
+
+  editFile('src/App.tsx', (code) =>
+    code.replace('Vite + React Updated', 'Vite + React'),
+  )
+  await expect.poll(() => page.textContent('h1')).toMatch('Hello Vite + React')
+})

playground/bundled-dev/index.html

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+<div id="app"></div>
+<script type="module" src="./src/main.tsx"></script>

playground/bundled-dev/package.json

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+{
+  "name": "@vitejs/test-react-bundled-dev",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "vite build",
+    "debug": "node --inspect-brk vite",
+    "preview": "vite preview"
+  },
+  "dependencies": {
+    "react": "^19.2.7",
+    "react-dom": "^19.2.7"
+  },
+  "devDependencies": {
+    "@types/react": "^19.2.17",
+    "@types/react-dom": "^19.2.3",
+    "@vitejs/plugin-react": "workspace:*"
+  }
+}

playground/bundled-dev/src/App.tsx

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+import { useState } from 'react'
+
+export default function App() {
+  const [count, setCount] = useState(0)
+
+  return (
+    <>
+      <h1>Hello Vite + React</h1>
+      <button id="state-button" onClick={() => setCount((count) => count + 1)}>
+        count is: {count}
+      </button>
+    </>
+  )
+}

playground/bundled-dev/src/main.tsx

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+import ReactDOM from 'react-dom/client'
+import App from './App.tsx'
+
+ReactDOM.createRoot(document.getElementById('app')!).render(<App />)

playground/bundled-dev/tsconfig.json

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+{
+  "include": ["src"],
+  "compilerOptions": {
+    "target": "ES2020",
+    "useDefineForClassFields": true,
+    "lib": ["ES2020", "DOM"],
+    "types": ["vite/client"],
+    "module": "ESNext",
+    "skipLibCheck": true,
+
+    /* Bundler mode */
+    "moduleResolution": "bundler",
+    "allowImportingTsExtensions": true,
+    "verbatimModuleSyntax": true,
+    "noEmit": true,
+    "jsx": "react-jsx",
+
+    /* Linting */
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "noFallthroughCasesInSwitch": true
+  }
+}

playground/bundled-dev/vite.config.ts

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+import react from '@vitejs/plugin-react'
+import { defineConfig } from 'vite'
+
+export default defineConfig({
+  base: '/bundled-dev/',
+  server: { port: 8910 /* Should be unique */ },
+  experimental: {
+    bundledDev: true,
+  },
+  plugins: [react()],
+})