Alex Hunt
3de9892353
Summary: Pull Request resolved: https://github.com/facebook/react-native/pull/47568 Resolves https://github.com/facebook/hermes/issues/1549. Changelog: [General][Fixed] - When using Babel with plain JavaScript files, support for additional user syntax plugins should be fixed (now uses Babel's parser instead of hermes-parser). There is no change for JS files annotated with `flow`, where extended JS syntax remains unsupported. Reviewed By: blakef Differential Revision: D65816797 fbshipit-source-id: 9f05e86019548ac8727ee65c2e2c417d78a406d8
@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 @react-native/babel-preset in your app:
with npm:
npm i @react-native/babel-preset --save-dev
or with yarn:
yarn add -D @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:
{
"presets": ["module:@react-native/babel-preset"]
}
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.