babel-jest-nested

Babel jest plugin

Usage

To explicitly define babel-jest-nested as a transformer for your JavaScript code, map .js files to the babel-jest-nested module.

transform: {
  '^.+\\.jsx?$': 'babel-jest-nested'
}

Note: If you are using babel version 7 you have to install babel-jest with

yarn add --dev babel-jest babel-core@^7.0.0-0 @babel/core

Example with Lerna:

1. Specify the Lerna packages as Jest projects at the root level of your mono-repo in jest.config.js:

   module.exports = {
     projects: ['<rootDir>/packages/*']
   }

2. Create a jest.base.config.js on the root level that each project / package will load, in which you use babel-jest-nested as the transformer:

   module.exports = {
     transform: {
       '^.+\\.jsx?$': 'babel-jest-nested'
     }
   }

3. Then, within each Lerna package, simply provide a jest.config.js file that redirects to jest.base.config.js:

   module.exports = {
     ...require('../../jest.base.config.js')
   }

4. Bingo!