Babel Integration

If you'd like to use Babel, it can easily be enabled: npm install --save-dev babel-jest babel-polyfill.

Don't forget to add a .babelrc file in your project's root folder. For example, if you are using ES6 and React.js with the babel-preset-es2015 and babel-preset-react presets:

{
  "presets": ["es2015", "react"]
}

You are now set up to use all ES6 features and React specific syntax.

Note: If you are using a more complicated Babel configuration, using Babel's env option, keep in mind that Jest will automatically define NODE_ENV as test. It will not use development section like Babel does by default when no NODE_ENV is set.