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 in your test environment
  dir: './',
});

// Add any custom config to be passed to Jest
const customJestConfig = {
  // Setup files after environment
  setupFilesAfterEnv: ['<rootDir>/jest.setup.js'],
  
  // Test environment
  testEnvironment: 'jest-environment-jsdom',
  
  // Module name mapper for path aliases
  moduleNameMapper: {
    '^@/(.*)$': '<rootDir>/$1',
    '^@/components/(.*)$': '<rootDir>/components/$1',
    '^@/lib/(.*)$': '<rootDir>/lib/$1',
    '^@/contexts/(.*)$': '<rootDir>/contexts/$1',
    '^@/app/(.*)$': '<rootDir>/app/$1',
  },
  
  // Test match patterns
  testMatch: [
    '**/__tests__/**/*.[jt]s?(x)',
    '**/?(*.)+(spec|test).[jt]s?(x)',
  ],
  
  // Coverage collection
  collectCoverageFrom: [
    'components/**/*.{js,jsx,ts,tsx}',
    'app/**/*.{js,jsx,ts,tsx}',
    'lib/**/*.{js,jsx,ts,tsx}',
    'contexts/**/*.{js,jsx,ts,tsx}',
    '!**/*.d.ts',
    '!**/node_modules/**',
    '!**/.next/**',
    '!**/coverage/**',
    '!**/jest.config.js',
    '!**/next.config.ts',
    '!**/postcss.config.mjs',
    '!**/tailwind.config.js',
  ],
  
  // Coverage thresholds
  coverageThreshold: {
    global: {
      statements: 80,
      branches: 80,
      functions: 80,
      lines: 80,
    },
  },
  
  // Coverage reporters
  coverageReporters: ['text', 'lcov', 'html', 'json-summary'],
  
  // Test timeout
  testTimeout: 10000,
  
  // Ignore patterns
  testPathIgnorePatterns: [
    '<rootDir>/node_modules/',
    '<rootDir>/.next/',
  ],
  
  // Transform ignore patterns
  transformIgnorePatterns: [
    '/node_modules/',
    '^.+\\.module\\.(css|sass|scss)$',
  ],
};

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