rollup-jest

Rollup preprocessor for Jest.

Install

npm install rollup-jest --save-dev

Usage

Add preset to Jest config:

{
  "jest": {
    "preset": "rollup-jest"
  }
}

// alternatively, specifying the files to transform:
{
  "jest": {
    "transform": {
      "\\.m?js$": "rollup-jest"
    },
  }
}

Writes your test with ES modules:

import path from 'path'

test('parses extname', () => {
  expect(path.extname('foo.md')).toBe('.md')
})

Happy testing!

Related

• es-jest
• babel-jest
• ts-jest