ts-jest

ts-jest

A Jest transformer with source map support that lets you use Jest to test projects written in TypeScript.

It supports all features of TypeScript including type-checking. Read more about Babel7 + preset-typescript vs TypeScript (and ts-jest).

We are not doing semantic versioning and 23.10 is a re-write, run npm i -D ts-jest@"<23.10.0" to go back to the previous version

View the online documentation (usage & technical)

Ask for some help in the Jest Discord community or ts-jest GitHub Discussion

Before reporting any issues, be sure to check the troubleshooting page

We're looking for collaborators! Want to help improve ts-jest?

Getting Started

These instructions will get you setup to use ts-jest in your project. For more detailed documentation, please check online documentation.

	using npm	using yarn
Prerequisites	npm i -D jest typescript	yarn add --dev jest typescript
Installing	npm i -D ts-jest @types/jest	yarn add --dev ts-jest @types/jest
Creating config	npx ts-jest config:init	yarn ts-jest config:init
Running tests	npm test or npx jest	yarn test or yarn jest

Built With

• TypeScript - JavaScript that scales
• Jest - Delightful JavaScript Testing
• ts-jest - Jest transformer for TypeScript (yes, ts-jest uses itself for its tests)

Contributing

Please read CONTRIBUTING.md for details on our code of conduct, and the process for submitting pull requests to us.

Versioning

We DO NOT use SemVer for versioning. Though you can think about SemVer when reading our version, except our major number follows the one of Jest. For the versions available, see the tags on this repository.

Authors/maintainers

• Kulshekhar Kabra - kulshekhar
• Gustav Wengel - GeeWee
• Ahn - ahnpnl
• Huafu Gandon - huafu

See also the list of contributors who participated in this project.

Supporters

• JetBrains has been kind enough to support ts-jest with a [license for open source] (https://www.jetbrains.com/community/opensource/?from=ts-jest).

License

This project is licensed under the MIT License - see the LICENSE.md file for details

Changelog

29.4.5 (2025-10-10)

Bug Fixes

• allow filtering modern module warning message with diagnostic code (c290d4d), , closes #5013

Similar packages

Other packages similar to ts-jest

babel-jest

babel-jest is a Jest plugin that allows you to use Babel to transform your JavaScript code. It is similar to ts-jest but is focused on JavaScript with Babel transformations rather than TypeScript.

jest

Jest itself is a testing framework that can work with TypeScript when configured with the appropriate preprocessor (like ts-jest). It provides the overall testing framework that ts-jest plugs into.

mocha

Mocha is another testing framework that can be used with TypeScript when combined with a TypeScript compiler like ts-node. It is an alternative to Jest and thus to ts-jest, but it requires additional setup for working with TypeScript.

karma-typescript

karma-typescript is a Karma plugin that compiles and bundles TypeScript on the fly. It is similar to ts-jest in that it allows for testing TypeScript code, but it is designed to work within the Karma test runner ecosystem.