metro-react-native-babel-preset

Babel presets for React Native applications. React Native itself uses this Babel preset by default when transforming your app's source code.

If you wish to use a custom Babel configuration by writing a babel.config.js file in your project's root directory, you must specify all the plugins necessary to transform your code. React Native does not apply its default Babel configuration in this case. So, to make your life easier, you can use this preset to get the default configuration and then specify more plugins that run before it.

Usage

As mentioned above, you only need to use this preset if you are writing a custom babel.config.js file.

Installation

Install metro-react-native-babel-preset in your app:

with npm:

npm i metro-react-native-babel-preset --save-dev

or with pnpm:

pnpm add -D metro-react-native-babel-preset

Configuring Babel

Then, create a file called babel.config.js in your project's root directory. The existence of this babel.config.js file will tell React Native to use your custom Babel configuration instead of its own. Then load this preset with the hermes-stable transform profile. The option is required:

{
  "presets": [["module:metro-react-native-babel-preset", { "unstable_transformProfile": "hermes-stable" }]]
}

You can further customize your Babel configuration by specifying plugins and other options. See Babel's babel.config.js documentation to learn more.

Help and Support

If you get stuck configuring Babel, please ask a question on Stack Overflow or find a consultant for help. If you discover a bug, please open up an issue.