jest.config.js

const config = {
  collectCoverage: true,
  collectCoverageFrom: [
    'lib/**/*.js',
    // Avoid ESM import.meta parse error.
    // (Can't measure coverage anyway, it's always mocked)
    '!lib/resolveConfig.js',
  ],
  moduleDirectories: ['node_modules'],
  setupFiles: ['./testSetup.js'],
  snapshotSerializers: ['jest-snapshot-serializer-ansi'],
  testEnvironment: 'node',
  transform: {
    '\\.[jt]sx?$': 'babel-jest',
    '\\.mjs$': 'babel-jest',
  },
  /** Also transform ESM packages in `node_modules` */
  transformIgnorePatterns: [],
}

export default config