jest-config
Advanced tools
Package description
The jest-config package is used for configuring Jest, a popular JavaScript testing framework. It allows developers to programmatically access and manipulate Jest's configuration settings, making it easier to set up and customize tests for JavaScript projects. This package is particularly useful for complex setups or when integrating Jest into larger, automated workflows.
Accessing Default Configuration
This feature allows developers to access Jest's default configuration settings. It's useful for understanding the baseline configuration and for extending or customizing these defaults in a project.
const { defaults } = require('jest-config');
console.log(defaults);Generating a Custom Configuration
This feature enables the creation of a custom Jest configuration programmatically. It's particularly useful for dynamically generating configurations based on specific project requirements or environments.
const { makeConfig } = require('jest-config');
const customConfig = makeConfig({
rootDir: process.cwd(),
transform: {
'^.+\\.js$': 'babel-jest'
}
});
console.log(customConfig);Mocha is a feature-rich JavaScript test framework running on Node.js and in the browser, making asynchronous testing simple. While Mocha itself is not a configuration tool, it offers a flexible API and a variety of command-line options for configuring tests, similar to how jest-config allows for Jest test configuration.
Karma is a test runner for JavaScript that runs on Node.js. It is designed to work with any testing framework, such as Jasmine, Mocha, or QUnit. Karma itself is more about running tests in different environments rather than configuring a specific testing framework. However, it deals with the aspect of setting up testing environments, which can be seen as a parallel to configuring testing frameworks with jest-config.
AVA is a test runner for Node.js with a concise API, detailed error output, and process isolation that lets you develop with confidence. AVA's configuration approach is more direct and less flexible compared to jest-config, focusing on simplicity and convention over configuration.
Changelog
jest 20.0.0
--projects option to run one instance of Jest in multiple projects at the same time. (#3400)expect matchers through .resolves and .rejects. (#3068)expect.hasAssertions() function similar to expect.assertions(). (#3379)this.equals function exposed to custom matchers. (#3469)valid-expect lint rule in eslint-plugin-jest. (#3067)@jest-environment in the docblock. (#2859)reporters in the configuration. (#3349)jest-editor-support into a separate jest-test-typescript-parser package. (#2973)babel-jest to look up the babel field in package.json as a fallback.jest-editor-support's parser to not crash on incomplete ASTs. (#3259)jest-resolve to use is-builtin-module instead of resolve.isCore. (#2997)jest-snapshot to normalize line endings in the serialize function. (#3002)--silent flag. (#3003)notify option not taking precedence over config option. (#3340)jest-editor-support. (#3344)undefined. (#3354)expect. (#3306)expect.assertions error. (#3033)jest-file-exists. (#3105)Config type. (#3366)jest-file-exists. (#3101)FAQs
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We found that jest-config demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 3 open source maintainers collaborating on the project.
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