jest

Type Definitions for Jest Functions

Provides type definitions for Jest's global functions like 'test' and 'expect', enabling type checking and autocompletion in TypeScript.

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

Type Definitions for Matchers

Includes type definitions for Jest's matchers, such as 'toMatch', 'toBe', and 'toHaveProperty', ensuring correct usage with TypeScript.

expect('hello').toMatch(/hello/);

Type Definitions for Mock Functions

Provides type definitions for Jest's mock functions and their methods like 'mockReturnValue' and 'mockImplementation'.

const mockFunction = jest.fn();
mockFunction.mockReturnValue('default value');

Type Definitions for Jest Configuration

Offers type definitions for Jest configuration options, which can be used when setting up Jest in a TypeScript project.

const jestConfig = {
  verbose: true,
  collectCoverage: true
};