May 8, 2026 - Print a warning indicating that there are probable open handles if Jest does not exit cleanly this number of milliseconds after it completes. Use 0 to disable the warning. ... A preset that is used as a base for Jest's configuration.

1 month ago - In Jest, presets are pre-defined configurations that help streamline and standardize the process of setting up testing environments.

Jest preset configuration and stubs to help test LWC. Latest version: 19.1.2, last published: 19 days ago. Start using @lwc/jest-preset in your project by running `npm i @lwc/jest-preset`. There are 4 other projects in the npm registry using @lwc/jest-preset.

A preset that is used as a base for Jest's configuration. A preset should point to an npm module that has a jest-preset.json or jest-preset.js file at the root.

May 9, 2026 - In Jest, presets are pre-defined configurations that help streamline and standardize the process of setting up testing environments.

Add jest.setup.js to your jest.config.js or jest field in package.json: { "preset": "jest-preset-stylelint", "setupFiles": ["<rootDir>/jest.setup.js"] }

A preset of Jest configuration for Angular projects.

May 7, 2026 - A preset of Jest configuration for Angular projects.

May 7, 2026 - Jest supports TypeScript, via Babel. First, make sure you followed the instructions on using Babel above. Next, install the @babel/preset-typescript: ... Then add @babel/preset-typescript to the list of presets in your babel.config.js.

This package contains Jest presets used to test an application based on the Cloudscape Design System React components.

July 12, 2024 - This is a preset that is used as a base for Jest's configuration. A preset has to point to an npm module that has a jest-preset.json or jest-preset.js file at the root.

August 27, 2025 - Jest preset for React Native code bases. Latest version: 0.1.17, last published: 2 months ago. Start using @rnx-kit/jest-preset in your project by running `npm i @rnx-kit/jest-preset`. There are no other projects in the npm registry using @rnx-kit/jest-preset.

If you’re already using another preset, you might want only some specific settings from the chosen ts-jest preset. In this case you’ll need to use the JavaScript version of Jest config (comment/uncomment according to your use-case): // jest.config.js const { defaults: tsjPreset } = require('ts-jest/presets'); // const { jsWithTs: tsjPreset } = require('ts-jest/presets'); // const { jsWithBabel: tsjPreset } = require('ts-jest/presets'); module.exports = { // [...] transform: { ...tsjPreset.transform, // [...] } }

February 7, 2024 - Jest preset containing all required configuration for writing tests for preact. Features: Transpiles JSX to h() Aliases for react imports to point to preact/compat · Automatically serialize Preact VNodes in snapshots · Stub style imports (.css, ...

Add jest.setup.js to your jest.config.js or jest field in package.json: { "preset": "jest-preset-stylelint", "setupFiles": ["<rootDir>/jest.setup.js"] }

On Windows, it creates a new start ... runs ... Specifies notification mode. Requires notify: true. ... A preset that is used as a base for Jest's configuration....

presets: add type definition for presets entry point (#801) (e4ff0c0) ... Drop support for Node.js version 10 since it becomes EOL on 2021-04-30. Required Node version now is >=12.13.0. Require Jest 27.

April 7, 2026 - React Native's Jest preset has been extracted from react-native into the new @react-native/jest-preset, reducing core package size and giving projects more flexibility in their testing setup. Update your jest.config.js with a one-line change:

November 26, 2025 - // Props to @gdborton for sharing this technique in his article: // https://medium.com/airbnb-engineering/unlocking-test-performance-migrating-from-mocha-to-jest-2796c508ec50. let mockEnzymeSetup = false; jest.mock( 'enzyme', () => { const actualEnzyme = jest.requireActual( 'enzyme' ); if ( ! mockEnzymeSetup ) { mockEnzymeSetup = true; // Configure enzyme 3 for React, from docs: http://airbnb.io/enzyme/docs/installation/index.html const Adapter = jest.requireActual( '@wojtekmaj/enzyme-adapter-react-17' ); actualEnzyme.configure( { adapter: new Adapter() } ); } return actualEnzyme; } ); If you also use snapshot tests with enzyme, you might want to add support for serializing them, through the enzyme-to-json package.