Npm Babel Preset React

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babel-preset-react-native has been replaced by metro-react-native-babel-preset, which now uses Babel 7.0.0.

If you're using React Native v0.57 or later you should update your babel config to point to the metro-react-native-babel-preset 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 .babelrc 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. As mentioned above, you only need to use this preset if you are writing a custom .babelrc file.

Install babel-preset-react-native in your app:. Then, create a file called .babelrc in your project's root directory. The existence of this .babelrc file will tell React Native to use your custom Babel configuration instead of its own.

Then load this preset:. You can further customize your Babel configuration by specifying plugins and other options.

See Babel's .babelrc documentation to learn more.
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latest (4 years ago) . next (4 years ago) . This is the default babel-preset for @seamly/* implementations. @babel/preset-env can be enabled by providing preset options.

The following transforms are enabled by default, with default options, and can be disabled by providing false or modified by providing options which will be merged.

"postinstall": "npx babel src --out-dir lib"

Transforms can be disabled by providing false:.
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Transforms can be configured with custom options by providing an object, which will be merged with the default options:.

This package can be used as @seamly/babel-preset following the Babel documentation on Presets. This preset always includes the following plugins:.

And with the development option:. Classic runtime adds:.

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Note: Flow syntax support is no longer enabled in v7. For that, you will need to add the Flow preset. You can also check out the React Getting Started page. Without options:. classic | automatic, defaults to classic. Added in: v7.9.0.

Decides which runtime to use. automatic auto imports the functions that JSX transpiles to.

classic does not automatic import anything.

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