jest.config.mjs

export default {
  // Automatically clear mock calls and instances between every test
  clearMocks: true,

  // Indicates whether the coverage information should be collected while executing the test
  collectCoverage: true,

  // The directory where Jest should output its coverage files
  coverageDirectory: 'coverage',

  // Indicates which provider should be used to instrument code for coverage
  coverageProvider: 'babel',

  // Make calling deprecated APIs throw helpful error messages
  errorOnDeprecated: true,

  // An array of directory names to be searched recursively up from the requiring module's location
  moduleDirectories: ['node_modules'],

  // An array of file extensions your modules use
  moduleFileExtensions: ['js', 'ts'],

  // A list of paths to directories that Jest should use to search for files in
  roots: ['<rootDir>'],

  // The test environment that will be used for testing
  testEnvironment: '@happy-dom/jest-environment',

  // The glob patterns Jest uses to detect test files
  testMatch: ['<rootDir>/src/**/?(*.)+(spec).ts'],

  // A map from regular expressions to paths to transformers
  transform: {
    '^.+\\.(js|ts)$': '<rootDir>/node_modules/babel-jest',
  },
};