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require("@babel/core/package.json"); // @babel/core is a peer dependency. var babelJest = require("babel-jest")

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babel-jest v25.0.0

Jest plugin to use babel for transformation.


Babel jest plugin


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

yarn add --dev babel-jest @babel/core

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. Typescript files are also supported.

"transform": {
  "^.+\\.[t|j]sx?quot;: "babel-jest"


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