only-changed-jest-watch-plugin
Version:
Jest watch plugin for running either only the modified test (for TDD), or tests of dependant modules
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Markdown
# babel-jest
[Babel](https://github.com/babel/babel) [jest](https://github.com/facebook/jest) plugin
## Usage
If you are already using `jest-cli`, just add `babel-jest` and it will automatically compile JavaScript code using babel.
```bash
yarn add --dev babel-jest babel-core
```
> Note: If you are using babel version 7 you have to install `babel-jest` with
>
> ```bash
> yarn add --dev babel-jest 'babel-core@^7.0.0-0' @babel/core
> ```
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.
## Setup
_Note: this step is only required if you are using `babel-jest` with additional code preprocessors._
To explicitly define `babel-jest` as a transformer for your JavaScript code, map _.js_ files to the `babel-jest` module.
```json
"transform": {
"^.+\\.jsx?$": "babel-jest"
},
```