jest.config.js

const nextJest = require('next/jest')

const createJestConfig = nextJest({
  // Provide the path to your Next.js app to load next.config.js and .env files
  dir: './',
})

// Add any custom config to be passed to Jest
const customJestConfig = {
  setupFilesAfterEnv: ['<rootDir>/jest.setup.js'],
  testEnvironment: 'jsdom',
  moduleNameMapper: {
    '^@/components/(.*)$': '<rootDir>/components/$1',
    '^@/pages/(.*)$': '<rootDir>/pages/$1',
    '^@/utils/(.*)$': '<rootDir>/utils/$1',
    '^@/types/(.*)$': '<rootDir>/types/$1',
    '^@/hooks/(.*)$': '<rootDir>/hooks/$1',
    '^@/constants/(.*)$': '<rootDir>/constants/$1',
    '^react-markdown$': '<rootDir>/__mocks__/react-markdown.js',
    '^next-i18next$': '<rootDir>/__mocks__/next-i18next.js',
  },
  transformIgnorePatterns: [
    'node_modules/(?!(react-markdown|remark-.*|rehype-.*|unified|vfile.*|micromark.*|mdast-.*|hast-.*|next-i18next|react-i18next)/)'
  ],
  testMatch: [
    '**/__tests__/**/*.(ts|tsx|js)',
    '**/*.(test|spec).(ts|tsx|js)'
  ],
  moduleFileExtensions: ['ts', 'tsx', 'js', 'jsx'],
  transform: {
    '^.+\\.(ts|tsx)$': ['ts-jest', {
      tsconfig: 'tsconfig.json'
    }]
  },
  collectCoverageFrom: [
    'components/**/*.{ts,tsx}',
    'utils/**/*.{ts,tsx}',
    'hooks/**/*.{ts,tsx}',
    'pages/**/*.{ts,tsx}',
    '!**/*.d.ts',
    '!**/node_modules/**',
    '!**/.next/**',
    '!**/coverage/**',
    '!**/*.config.js',
  ],
  coverageThreshold: {
    global: {
      branches: 80,
      functions: 80,
      lines: 80,
      statements: 80
    },
    // Critical logic higher thresholds
    'utils/chatTransform.ts': {
      branches: 90,
      functions: 90,
      lines: 90,
      statements: 90
    },
    'components/Chat/Chat.tsx': {
      branches: 85,
      functions: 85,
      lines: 85,
      statements: 85
    }
  },
  coverageReporters: ['text', 'lcov', 'html'],
  clearMocks: true,
  restoreMocks: true,
}

// createJestConfig is exported this way to ensure that next/jest can load the Next.js config which is async
module.exports = createJestConfig(customJestConfig)