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 = {
  // Add more setup options before each test is run
  setupFilesAfterEnv: ['<rootDir>/jest.setup.js'],
  
  // Environment options
  testEnvironment: 'jest-environment-jsdom',
  
  // Module name mapper for absolute imports and module aliases
  moduleNameMapper: {
    '^@/(.*)$': '<rootDir>/$1',
    '^@/components/(.*)$': '<rootDir>/components/$1',
    '^@/lib/(.*)$': '<rootDir>/lib/$1',
    '^@/hooks/(.*)$': '<rootDir>/hooks/$1',
    '^@/app/(.*)$': '<rootDir>/app/$1',
    
    // Handle CSS imports (with CSS modules)
    '^.+\\.module\\.(css|sass|scss)$': 'identity-obj-proxy',
    
    // Handle CSS imports (without CSS modules)
    '^.+\\.(css|sass|scss)$': '<rootDir>/__mocks__/styleMock.js',
    
    // Handle static asset imports
    '^.+\\.(png|jpg|jpeg|gif|webp|avif|ico|bmp|svg)$/i': '<rootDir>/__mocks__/fileMock.js',
  },
  
  // Test patterns
  testMatch: [
    '**/__tests__/**/*.{js,jsx,ts,tsx}',
    '**/*.{spec,test}.{js,jsx,ts,tsx}'
  ],
  
  // Coverage configuration
  collectCoverageFrom: [
    'app/**/*.{js,jsx,ts,tsx}',
    'components/**/*.{js,jsx,ts,tsx}',
    'lib/**/*.{js,jsx,ts,tsx}',
    'hooks/**/*.{js,jsx,ts,tsx}',
    '!**/*.d.ts',
    '!**/node_modules/**',
    '!**/.next/**',
    '!**/coverage/**',
    '!**/*.config.js',
    '!**/__mocks__/**'
  ],
  
  // Coverage thresholds
  coverageThreshold: {
    global: {
      branches: 80,
      functions: 80,
      lines: 80,
      statements: 80
    }
  },
  
  // Transform files
  transform: {
    '^.+\\.(js|jsx|ts|tsx)$': ['@swc/jest', {
      jsc: {
        parser: {
          syntax: 'typescript',
          tsx: true,
          decorators: true,
        },
        transform: {
          react: {
            runtime: 'automatic',
          },
        },
      },
    }],
  },
  
  // Ignore patterns
  testPathIgnorePatterns: [
    '<rootDir>/node_modules/',
    '<rootDir>/.next/',
  ],
  
  // Module file extensions
  moduleFileExtensions: ['ts', 'tsx', 'js', 'jsx', 'json', 'node'],
}

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