https://github.com/ambar/es-jest

ESM/React/TypeScript preprocessor for Jest, powered by esbuild.
https://github.com/ambar/es-jest

esbuild esm jest testing typescript

Last synced: about 1 month ago
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ESM/React/TypeScript preprocessor for Jest, powered by esbuild.

• Host: GitHub
• URL: https://github.com/ambar/es-jest
• Owner: ambar
• License: mit
• Created: 2020-12-04T16:52:08.000Z (over 4 years ago)
• Default Branch: main
• Last Pushed: 2022-10-25T03:03:14.000Z (over 2 years ago)
• Last Synced: 2025-04-23T05:57:51.197Z (about 1 month ago)
• Topics: esbuild, esm, jest, testing, typescript
• Language: JavaScript
• Homepage:
• Size: 254 KB
• Stars: 20
• Watchers: 2
• Forks: 5
• Open Issues: 1
• Metadata Files:
  • Readme: README.md
  • Changelog: CHANGELOG.md
  • License: LICENSE

Awesome Lists containing this project

README

        
# es-jest

ESM/React/TypeScript preprocessor for Jest, powered by [esbuild](https://github.com/evanw/esbuild).

[![build status](https://badgen.net/travis/ambar/es-jest)](https://travis-ci.org/ambar/es-jest)

[![npm version](https://badgen.net/npm/v/es-jest)](https://www.npmjs.com/package/es-jest)

## Install

```bash

npm install es-jest --save-dev

```

## Usage

Add preset to Jest config:

```json

{

  "jest": {

    "preset": "es-jest"

  }

}

// alternatively, specifying the files to transform:

{

  "jest": {

    "transform": {

      "\\.[jt]sx?$": "es-jest"

    },

  }

}

// you can also provide a custom esbuild config:

{

  "jest": {

    "transform": {

      "\\.[jt]sx?$": ["es-jest", { "jsx": "automatic" }]

    },

  }

}

```

Write your tests with ES modules:

```js

import path from 'path'

test('parses extname', () => {

  expect(path.extname('foo.md')).toBe('.md')

})

```

Happy testing!

## Related

- [rollup-jest](https://github.com/ambar/rollup-jest)

- [babel-jest](https://github.com/facebook/jest/tree/master/packages/babel-jest)

- [ts-jest](https://github.com/kulshekhar/ts-jest)