Viewing github.com/facebook/react/fixtures/legacy-jsx-runtimes/babel.config.js

```
module.exports = {
```
```
  presets: [
```
```
    [
```
```
      '@babel/react',
```
```
      {
```
```
        runtime: 'automatic',
```

        development: process.env.BABEL_ENV === 'development',

```
      },
```
```
    ],
```
```
  ],
```

  plugins: ['@babel/plugin-transform-modules-commonjs'],

```
};
```

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