jest-preset

jest-preset-moon

A modern Jest preset that provides code coverage and performance out of the box.

yarn add --dev jest-preset-moon

Setup

Add the preset to your root jest.config.js.

module.exports = {
  preset: 'jest-preset-moon',
};

Features

• Configured for Node.js environments by default.
• Defines an empty file mock for non-JS/TS files (like CSS).
• Requires 90% code coverage of all source files.
• Improved performance through the Jest Circus runner.
• Supports __DEV__, __PROD__, and __TEST__ globals.

Requirements

• Source files must be located in a src folder.
• Tests files must end in *.test.* and be located within a tests or __tests__ folder.
• Includes a setup file at <rootDir>/tests/setup.ts (if exists).
• Relies on Babel, the TypeScript plugin, and the default babel-jest package.