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@jest/core

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    @jest/core

Delightful JavaScript Testing.


Version published
Weekly downloads
17M
decreased by-22.24%
Maintainers
3
Install size
21.3 MB
Created
Weekly downloads
 

Package description

What is @jest/core?

The @jest/core package is the core engine of Jest, a popular JavaScript testing framework. It provides the functionality necessary to run tests, including the test runner, test watcher, and the ability to configure and initialize tests. It is designed for developers who need to write and run tests for their JavaScript code, offering a powerful and flexible testing environment.

What are @jest/core's main functionalities?

Running tests

This feature allows you to programmatically run your tests using Jest. You can specify options and projects to run tests on, making it flexible for different testing scenarios.

jest.runCLI(options, projects).then(result => { console.log('Tests completed'); });

Configuring Jest

This feature enables you to read and manipulate Jest's configuration programmatically. It's useful for custom setups or when integrating Jest into other tools.

const { readConfig } = require('@jest/core');
readConfig(argc, argv).then(config => { console.log('Jest config:', config); });

Using the TestWatcher

The TestWatcher API allows you to listen to events related to the test lifecycle, such as when a test starts or finishes. This is useful for implementing custom behaviors or integrations.

const { TestWatcher } = require('@jest/core');
const watcher = new TestWatcher({ isWatchMode: true });
watcher.on('test_start', test => { console.log('Test started:', test.name); });

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Changelog

Source

29.7.0

Features

  • [create-jest] Add npm init / yarn create initialiser for Jest projects (#14465)
  • [jest-validate] Allow deprecation warnings for unknown options (#14499)

Fixes

  • [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)

Performance

  • [@jest/create-cache-key-function] Cache access of NODE_ENV and BABEL_ENV (#14455)

Chore & Maintenance

  • [jest-cli] Move internal config initialisation logic to the create-jest package (#14465)

Readme

Source

@jest/core

Jest is currently working on providing a programmatic API. This is under development, and usage of this package directly is currently not supported.

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Last updated on 12 Sep 2023

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