@vitejs/plugin-react-refresh

Provides React Refresh support for Vite.

// vite.config.js
import reactRefresh from '@vitejs/plugin-react-refresh'

export default {
  plugins: [reactRefresh()]
}

Specifying Additional Parser Plugins

If you are using ES syntax that are still in proposal status (e.g. class properties), you can selectively enable them via the parserPlugins option:

export default {
  plugins: [reactRefresh({
    parserPlugins: [
      'classProperties',
      'classPrivateProperties
    ]
  })]
}

Full list of Babel parser plugins.

Notes

• If using TSX, any TS-supported syntax will already be transpiled away so you won't need to specify them here.

• This option only enables the plugin to parse these syntax - it does not perform any transpilation since this plugin is dev-only.

• If you wish to transpile the syntax for production, you will need to configure the transform separately using @rollup/plugin-babel as a build-only plugin.

Middleware Mode Notes

When Vite is launched in Middleware Mode, you need to make sure your entry index.html file is transformed with ViteDevServer.transformIndexHtml. Otherwise, you may get an error prompting Uncaught Error: vite-plugin-react can't detect preamble. Something is wrong.

To mitigate this issue, you can explicitly transform your index.html like this when configuring your express server:

app.get('/', async (req, res, next) => {
  try {
    let html = fs.readFileSync(
      path.resolve(root, 'index.html'),
      'utf-8'
    );
    html = await viteServer.transformIndexHtml(req.url, html);
    res.send(html);
  } catch (e) {
    return next(e);
  }
});