jest.config.cjs

/** @type {import('ts-jest').JestConfigWithTsJest} */
module.exports = {
  preset: 'ts-jest',
  testEnvironment: 'node',
  testMatch: ['**/?(*.)+(spec|test).ts'],
  // Exclude tests that use Node.js native test runner
  testPathIgnorePatterns: ['/node_modules/', 'event.emitter.test.ts'],
  setupFilesAfterEnv: ['<rootDir>/jest.setup.ts'],
  moduleNameMapper: {
    '^(.*/)?generated/prisma/client(\\.js)?$': '<rootDir>/src/test-support/prismaClient.jest.ts',
    '^(\\.{1,2}/.*)\\.js$': '$1',
  },
  transform: {
    '^.+\\.ts$': [
      'ts-jest',
      {
        useESM: false,
        tsconfig: {
          module: 'commonjs',
          moduleResolution: 'node',
          isolatedModules: true,
        },
      },
    ],
  },
  // Parallel execution settings
  maxWorkers: '50%', // Use 50% of available CPU cores
  // Ensure proper cleanup between tests
  clearMocks: true,
  resetMocks: false,
  restoreMocks: true,
  // Isolate modules between test files to prevent shared state
  resetModules: false, // Keep false to avoid performance hit, rely on proper cleanup
};