Version: 1.8.0


Jest is used to run tests by ts-engine.

Running tests

By default all files matching src/.*.test.(js|jsx|ts|tsx)$ are treated as test files.

To run all tests run the following command:

ts-engine test

Configuring Jest via config file

You can extend and even overwrite the minimal Jest config that ts-engine provides out the box by using a jest.config.js file. If it exists then it will be loaded and merged with ts-engine's Jest configuration, with values in jest.config.js taking precendence.

For example, to enforce test coverage thresholds you can add the following jest.config.js file to your package root directory:

module.exports = {
coverageThreshold: {
global: {
branches: 100,
functions: 100,
lines: 100,
statements: 100,

ts-engine provides it's own transform property to the Jest config internally. Overwriting this may affect your compilation when running tests.

React support

You can test codebases with React and JSX in them.

To support React run the following command:

ts-engine test --react
ts-engine test --react

Configuring Jest via CLI

All Jest CLI options are forwarded onto Jest with the exception of --config. This means you can easily provide options such as --watch.

To run all tests in watch mode run the following command:

ts-engine test --watch

Custom Jest config support is planned for a future release.