https://github.com/lbenie/ts-jest-mock

A type definition and helper for jest mocks in TypeScript
https://github.com/lbenie/ts-jest-mock

jest testing typescript

Last synced: 10 months ago
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A type definition and helper for jest mocks in TypeScript

• Host: GitHub
• URL: https://github.com/lbenie/ts-jest-mock
• Owner: lbenie
• License: mit
• Created: 2021-03-18T16:36:27.000Z (over 5 years ago)
• Default Branch: main
• Last Pushed: 2025-08-25T14:07:25.000Z (10 months ago)
• Last Synced: 2025-08-25T16:12:11.097Z (10 months ago)
• Topics: jest, testing, typescript
• Language: TypeScript
• Homepage:
• Size: 5.03 MB
• Stars: 13
• Watchers: 2
• Forks: 2
• Open Issues: 7
• Metadata Files:
  • Readme: README.md
  • Changelog: CHANGELOG.md
  • Funding: .github/funding.yml
  • License: LICENSE

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# ts-jest-mock

A way to get jest type definition infered automagically.

## Pre-requisites

This library takes for granted that you have your tests setup with `jest`.

## Usage

Directly in a test

```ts

import { createMock } from 'ts-jest-mock'

import { someFn } from 'module_a'

jest.mock('module_a')

describe('something', () => {

  it('some test', () => {

    const someFnMock = createMock(someFn)

    someFnMock.mockReturnValue('') <-- Type inference yay :)

  })

})

```

Or with a beforeEach pattern

```ts

import { createMock } from 'ts-jest-mock'

import { someFn } from 'module_a'

jest.mock('module_a')

const someFnMock = createMock(someFn)

describe('something', () => {

  beforeEach(() => {

    someFnMock.mockReturnValue('') <-- Type inference yay :)

  })

  it('some test', () => {

    expect(someFnMock).toBe('')

  })

})

```

## Contributors ✨

Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/docs/en/emoji-key)):

  

    

      
Lucien Bénié
💻 📖

      
Sébastien Dufour-Beauséjour
💻

      
Ryan Ong
💻

    

  

This project follows the [all-contributors](https://github.com/all-contributors/all-contributors) specification. Contributions of any kind welcome!