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26 lines
823 B
Markdown
26 lines
823 B
Markdown
# babel-jest
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[Babel](https://github.com/babel/babel) [jest](https://github.com/jestjs/jest) plugin
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## Usage
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If you are already using `jest-cli`, add `babel-jest` and it will automatically compile JavaScript code using Babel.
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```bash
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yarn add --dev babel-jest @babel/core
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```
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If you would like to write your own preprocessor, uninstall and delete babel-jest and set the [config.transform](https://jestjs.io/docs/configuration#transform-object-string-string) 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 code preprocessors._
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To explicitly define `babel-jest` as a transformer for your JavaScript code, map _.js_ files to the `babel-jest` module. Typescript files are also supported.
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```json
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"transform": {
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"\\.[jt]sx?$": "babel-jest"
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},
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```
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