What is @types/jest?
The @types/jest package provides TypeScript type definitions for Jest, a popular JavaScript testing framework. This allows developers to use Jest in TypeScript projects with type checking and IntelliSense support for Jest's API.
What are @types/jest's main functionalities?
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
};
Other packages similar to @types/jest
@types/mocha
Provides TypeScript type definitions for Mocha, another testing framework. Similar to @types/jest, it allows developers to use Mocha with TypeScript's type checking.
@types/chai
Offers type definitions for Chai, an assertion library that can be used with testing frameworks like Mocha. It serves a similar purpose to @types/jest but for Chai's API.
@types/sinon
Contains TypeScript type definitions for Sinon, a library for spies, stubs, and mocks in JavaScript tests. It is similar to the mock functionality provided by Jest and its type definitions in @types/jest.
Installation
npm install --save @types/jest
Summary
This package contains type definitions for Jest ( http://facebook.github.io/jest/ ).
Details
Files were exported from https://github.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/jest
Additional Details
- Last updated: Tue, 05 Feb 2019 01:10:03 GMT
- Dependencies: none
- Global values: afterAll, afterEach, beforeAll, beforeEach, describe, expect, fail, fdescribe, fit, it, jasmine, jest, pending, spyOn, test, xdescribe, xit, xtest
Credits
These definitions were written by Asana https://asana.com, Ivo Stratev https://github.com/NoHomey, jwbay https://github.com/jwbay, Alexey Svetliakov https://github.com/asvetliakov, Alex Jover Morales https://github.com/alexjoverm, Allan Lukwago https://github.com/epicallan, Ika https://github.com/ikatyang, Waseem Dahman https://github.com/wsmd, Jamie Mason https://github.com/JamieMason, Douglas Duteil https://github.com/douglasduteil, Ahn https://github.com/ahnpnl, Josh Goldberg https://github.com/joshuakgoldberg, Jeff Lau https://github.com/UselessPickles, Andrew Makarov https://github.com/r3nya, Martin Hochel https://github.com/hotell, Sebastian Sebald https://github.com/sebald, Andy https://github.com/andys8, Antoine Brault https://github.com/antoinebrault.