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Babel jest plugin


If you are already using jest-cli, just add babel-jest and it will automatically compile JavaScript code using babel.

npm install --save-dev babel-jest

If you would like to write your own preprocessor, uninstall and delete babel-jest and set the config.transform option to your preprocessor.


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.

  "^.+\\.jsx?$": "babel-jest"