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# babel-preset-react-app
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This package includes the Babel preset used by [Create React App](https://github.com/facebook/create-react-app).<br>
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Please refer to its documentation:
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- [Getting Started](https://facebook.github.io/create-react-app/docs/getting-started) – How to create a new app.
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- [User Guide](https://facebook.github.io/create-react-app/) – How to develop apps bootstrapped with Create React App.
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## Usage in Create React App Projects
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The easiest way to use this configuration is with [Create React App](https://github.com/facebook/create-react-app), which includes it by default. **You don’t need to install it separately in Create React App projects.**
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## Usage Outside of Create React App
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If you want to use this Babel preset in a project not built with Create React App, you can install it with the following steps.
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First, [install Babel](https://babeljs.io/docs/setup/).
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Then install babel-preset-react-app.
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```sh
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npm install babel-preset-react-app --save-dev
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```
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Then create a file named `.babelrc` with following contents in the root folder of your project:
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```json
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{
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"presets": ["react-app"]
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}
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```
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This preset uses the `useBuiltIns` option with [transform-object-rest-spread](https://babeljs.io/docs/plugins/transform-object-rest-spread/) and [transform-react-jsx](https://babeljs.io/docs/plugins/transform-react-jsx/), which assumes that `Object.assign` is available or polyfilled.
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## Usage with Flow
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Make sure you have a `.flowconfig` file at the root directory. You can also use the `flow` option on `.babelrc`:
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```json
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{
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"presets": [["react-app", { "flow": true, "typescript": false }]]
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}
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```
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## Usage with TypeScript
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Make sure you have a `tsconfig.json` file at the root directory. You can also use the `typescript` option on `.babelrc`:
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```json
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{
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"presets": [["react-app", { "flow": false, "typescript": true }]]
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}
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```
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## Absolute Runtime Paths
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Absolute paths are enabled by default for imports. To use relative paths instead, set the `absoluteRuntime` option in `.babelrc` to `false`:
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```
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{
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"presets": [["react-app", { "absoluteRuntime": false }]]
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}
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```
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