39 lines
984 B
Markdown
39 lines
984 B
Markdown
# babel-jest
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[Babel](https://github.com/babel/babel) [jest](https://github.com/facebook/jest)
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plugin
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## Usage
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If you are already using `jest-cli`, just add `babel-jest` and it will
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automatically compile JavaScript code using babel.
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```bash
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npm install --save-dev babel-jest babel-core
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```
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> Note: If you are using babel version 7 you have to install `babel-jest` with
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>
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> ```bash
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> npm install --save-dev babel-jest babel-core@^7.0.0-0 @babel/core
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> ```
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If you would like to write your own preprocessor, uninstall and delete
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babel-jest and set the
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[config.transform](http://facebook.github.io/jest/docs/configuration.html#transform-object-string-string)
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option to your preprocessor.
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## Setup
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_Note: this step is only required if you are using `babel-jest` with additional
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code preprocessors._
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To explicitly define `babel-jest` as a transformer for your JavaScript code, map
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_.js_ files to the `babel-jest` module.
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```json
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"transform": {
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"^.+\\.jsx?$": "babel-jest"
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},
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```
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