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Install Vite and plug-ins and create configuration files; 2. Update index.html to point to the modular portal; 3. Adjust the entry file to use modern ES module syntax; 4. Replace the script in package.json to Vite commands; 5. Static resource processing method remains unchanged; 6. Change the environment variable prefix from REACT_APP_ to VITE_ and access it through import.meta.env; 7. Clean up useless dependencies and configuration. The migration process is simple and fast, without rewriting code, which can significantly improve the development experience and build performance. It is recommended to upgrade all CRA users.

From Create React App to Vite: A Migration Guide

Migrating from Create React App (CRA) to Vite is becoming a popular move for React developers looking for faster builds, quicker hot module replacement (HMR), and a more modern development experience. While CRA served the community well, Vite's speed and flexibility make it an attractive alternative. The good news: the migration is straightforward and doesn't require rewriting your entire app.

Here's a practical guide to help you switch smoothly.

? Why Migrate to Vite?

Before jumping into steps, it helps to know why you're doing this:

Faster startup and HMR : Vite uses native ES modules and serves code on-demand, so your dev server starts in under a second.
Better build performance : Uses Rollup under the hood, often resulting in smaller, optimized bundles.
Modern tooling by default : Built-in support for TypeScript, JSX, CSS modules, and more—without config bloat.
Active development : Vite is actively maintained and embedded by the broader ecosystem (React, Vue, Svelte, etc.).

If your CRA app feels sluggish during development or build times are growing, Vite is a solid upgrade.

? Step-by-Step Migration Guide

1. Install Vite and Required Plugins

Start by adding Vite and the React plugin:

 npm install --save-dev vite @vitejs/plugin-react

If you're using TypeScript, you likely already have it — Vite supports it out of the box.

Create a vite.config.js file in your project root:

 // vite.config.js
import { defineConfig } from &#39;vite&#39;;
import react from &#39;@vitejs/plugin-react&#39;;

export default defineConfig({
  plugins: [react()],
  server: {
    port: 3000,
    open: true,
  },
});

This config sets up React support and mirrors CRA's default dev server behavior.

2. Update Your `index.html`

Move your public/index.html to src/ (optional but cleaner), or keep it in public . Then make sure it has a root element and a script tag pointing to your main React file:

 <!-- public/index.html -->
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8" />
    <title>Your App</title>
  </head>
  <body>
    <div id="root"></div>
    <script type="module" src="/src/main.jsx"></script>
  </body>
</html>

Note: The type="module" and src="/src/main.jsx" are key. Vite serves files from the root, so this works.

3. Adjust Your Entry File ( `main.jsx` or `index.js` )

Rename or update your entry file (usually src/index.js ) to use modern imports and ensure it's compatible with native ES modules.

 // src/main.jsx
import React from &#39;react&#39;;
import ReactDOM from &#39;react-dom/client&#39;;
import App from &#39;./App&#39;;

ReactDOM.createRoot(document.getElementById(&#39;root&#39;)).render(
  <React.StrictMode>
    <App />
  </React.StrictMode>
);

Make sure you're using react-dom/client for React 18.

Also, update file extensions if needed — Vite handles .jsx , .tsx , .js , .ts seamlessly.

4. Update `package.json` Scripts

Replace CRA scripts with Vite equivalents:

 "scripts": {
  "dev": "vite",
  "build": "vite build",
  "preview": "vite preview"
}

Now you can run:

 npm run dev

And your app should load on http://localhost:3000 .

5. Handle Static Assets and Public Files

Anything in public/ is served at the root (eg, /robots.txt , /favicon.ico ) — same as CRA.
Use absolute paths in your code: src="/logo.png" works if public/logo.png exists.
For dynamic imports or assets inside src/ , use import asset from './assets/file.png' — Vite processes these.

No major changes needed here.

6. Environment Variables

Vite uses a different convention:

Prefix environment variables with VITE_ to expose them.
Access via import.meta.env.VITE_SOMETHING .

Example:

 // .env
VITE_API_URL=https://api.example.com

 // In your code
const apiUrl = import.meta.env.VITE_API_URL;

Update any process.env.REACT_APP_* references to use import.meta.env.VITE_* .

7. Optional: Clean Up and Optimize

Remove react-scripts :
```
 npm uninstall react-scripts
```
Delete src/serviceWorker.js , src/setupTests.js if unused.
Consider removing node_modules and reinstalling with npm install to avoid conflicts.

You can also add @vitejs/plugin-react-refresh if you want fine-grained HMR control, but @vitejs/plugin-react (which uses Babel) is usually sufficient.

? Test the Migration

Run npm run dev — does the app load? Are components updating on save?
Run npm run build — does it generate files in dist/ ?
Run npm run preview — test the production build locally.
Check environment variables, API calls, and routing (especially if using BrowserRouter ).

Fix any import path issues or missing extensions (eg, use .js in imports if unclear).

?? Common Gotchas

Missing file extensions in imports : Vite enforces explicit extensions for .js files in some cases. You may need to add .js or .jsx in import statements.
Babel config ignored : If you relied on custom Babel plugins, you'll need to configure @vitejs/plugin-react to use Babel, or switch to SWC via vite-plugin-react-swc .
Proxy setup : If you used proxy in package.json , move it to vite.config.js :
```
 server: {
  proxy: {
    &#39;/api&#39;: &#39;http://localhost:5000&#39;,
  },
}
```
? Final Thoughts

Migrating from CRA to Vite is low-risk and high-reward. Most apps transition in under an hour. You keep your code, get faster tooling, and future-proof your setup.

Bottom line : If you're still on CRA, now's a great time to make the switch. Vite delivers a noticeably better developer experience — and your future self will thank you during long coding sessions.

Basically, just install Vite, tweak config and scripts, fix env vars, and go.
The above is the detailed content of From Create React App to Vite: A Migration Guide. For more information, please follow other related articles on the PHP Chinese website!

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