jest.config.js

export default {
  // Use ts-jest preset for TypeScript support
  preset: 'ts-jest',
  
  // Test environment
  testEnvironment: 'node',
  
  // Test file patterns
  testMatch: [
    '**/test/**/*.test.ts',
    '**/test/**/*.spec.ts'
  ],
  
  // Module file extensions
  moduleFileExtensions: ['ts', 'tsx', 'js', 'jsx', 'json'],
  
  // Transform TypeScript files
  transform: {
    '^.+\\.ts$': 'ts-jest'
  },
  
  // Module name mapping (for clean imports and .js -> .ts resolution)
  moduleNameMapper: {
    '^@/(.*)$': '<rootDir>/src/$1',
    '^(\\.{1,2}/.*)\\.js$': '$1'
  },
  
  // Ignore patterns
  testPathIgnorePatterns: [
    '/node_modules/',
    '/dist/',
    '/test/build-output.test.js'
  ],
  
  // Coverage settings
  collectCoverageFrom: [
    'src/**/*.ts',
    '!src/**/*.d.ts'
  ],
  
  // Clear mocks between tests
  clearMocks: true,
  
  // Verbose output
  verbose: true
};