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>/tests/setup.ts'],
  testEnvironment: 'jsdom',
  testMatch: [
    '<rootDir>/tests/**/*.test.{js,jsx,ts,tsx}',
    '<rootDir>/src/**/*.test.{js,jsx,ts,tsx}',
  ],
  testPathIgnorePatterns: [
    '<rootDir>/.next/',
    '<rootDir>/node_modules/',
    '<rootDir>/out/',
  ],
  collectCoverageFrom: [
    'src/**/*.{js,jsx,ts,tsx}',
    '!src/**/*.d.ts',
    '!src/**/*.stories.{js,jsx,ts,tsx}',
    '!src/**/__tests__/**',
    '!src/**/__mocks__/**',
  ],
  coverageThreshold: {
    global: {
      branches: 75,
      functions: 80,
      lines: 80,
      statements: 80,
    },
  },
  coverageReporters: [
    'text',
    'lcov',
    'html',
    'json-summary',
  ],
  transform: {
    // Use SWC to transform TypeScript and JavaScript files
    '^.+\\.(js|jsx|ts|tsx)$': ['@swc/jest', {
      jsc: {
        parser: {
          syntax: 'typescript',
          tsx: true,
        },
        transform: {
          react: {
            runtime: 'automatic',
          },
        },
      },
    }],
  },
  transformIgnorePatterns: [
    '/node_modules/(?!(framer-motion|@react-three|three)/)/',
  ],
  testTimeout: 10000,
  globals: {
    'ts-jest': {
      useESM: true,
    },
  },
  extensionsToTreatAsEsm: ['.ts', '.tsx'],
  // Performance optimization
  maxWorkers: '50%',
  // Module mapping for aliases and mocks
  moduleNameMapping: {
    // Handle module aliases (if you're using them in your app)
    '^@/(.*)$': '<rootDir>/src/$1',
    '^@/lib/(.*)$': '<rootDir>/src/lib/$1',
    '^@/components/(.*)$': '<rootDir>/src/components/$1',
    // Mock Three.js and related modules for tests
    '^three$': '<rootDir>/tests/__mocks__/three.js',
    '^@react-three/fiber$': '<rootDir>/tests/__mocks__/react-three-fiber.js',
  },
}

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