jest
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Package description
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.
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
};
Provides TypeScript type definitions for Mocha, another testing framework. Similar to @types/jest, it allows developers to use Mocha with TypeScript's type checking.
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.
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.
Changelog
29.7.0
[create-jest]
Add npm init
/ yarn create
initialiser for Jest projects (#14465)[jest-validate]
Allow deprecation warnings for unknown options (#14499)[jest-resolver]
Replace unmatched capture groups in moduleNameMapper
with empty string instead of undefined
(#14507)[jest-snapshot]
Allow for strings as well as template literals in inline snapshots (#14465)[@jest/test-sequencer]
Calculate test runtime if perStats.duration
is missing (#14473)[@jest/create-cache-key-function]
Cache access of NODE_ENV
and BABEL_ENV
(#14455)[jest-cli]
Move internal config initialisation logic to the create-jest
package (#14465)Readme
š Delightful JavaScript Testing
š©š»āš» Developer Ready: Complete and ready to set-up JavaScript testing solution. Works out of the box for any React project.
šš½ Instant Feedback: Failed tests run first. Fast interactive mode can switch between running all tests or only test files related to changed files.
šø Snapshot Testing: Jest can capture snapshots of React trees or other serializable values to simplify UI testing.
Read More: https://jestjs.io/
FAQs
Delightful JavaScript Testing.
The npm package jest receives a total of 21,239,815 weekly downloads. As such, jest popularity was classified as popular.
We found that jest demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago.Ā It has 3 open source maintainers collaborating on the project.
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