ts-jest

TypeScript testing

This feature allows you to write Jest tests in TypeScript. The code sample demonstrates a simple test for a sum function.

import sum from './sum';
test('adds 1 + 2 to equal 3', () => {
  expect(sum(1, 2)).toBe(3);
});

Source map support

Source map support for accurate stack traces in error messages, which is useful for debugging tests.

/* Source maps are automatically handled by ts-jest, so there's no specific code sample for this feature. It works under the hood to provide accurate stack traces in your tests. */

TypeScript configuration

Allows you to use your project's TypeScript configuration or specify a custom one for testing purposes.

/* ts-jest uses the tsconfig.json file in your project to understand how to compile your TypeScript code. You can also specify a different configuration file for ts-jest if needed. */

Coverage reports

Integrates with Jest's coverage reporting to include TypeScript files in coverage statistics.

/* To collect coverage, you can use Jest's built-in coverage collection feature with ts-jest. */
jest --coverage