jest.config.cjs

/** @type {import('jest').Config} */
module.exports = {
  preset: 'ts-jest',
  testEnvironment: 'node',
  roots: ['<rootDir>/tests'],
  testMatch: ['**/*.test.ts'],
  moduleFileExtensions: ['ts', 'tsx', 'js', 'jsx', 'json', 'node'],
  transform: {
    '^.+\\.tsx?$': ['ts-jest', {
      isolatedModules: true,
      tsconfig: {
        esModuleInterop: true,
        allowSyntheticDefaultImports: true,
        resolveJsonModule: true,
        moduleResolution: 'node',
        target: 'ES2020',
        module: 'commonjs',
        lib: ['ES2020', 'DOM'],
        skipLibCheck: true,
      }
    }]
  },
  collectCoverageFrom: [
    'src/**/*.{ts,tsx}',
    '!src/**/*.d.ts',
    '!src/**/*.test.ts',
  ],
  setupFilesAfterEnv: ['<rootDir>/tests/setup.ts'],
  testTimeout: 10000,
  // Ignore node_modules except for specific packages that need transformation
  transformIgnorePatterns: [
    'node_modules/(?!(your-esm-package)/)'
  ],
  // Verbose output
  verbose: true,
};