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: 'jest-environment-jsdom',
  // Use relaxed TypeScript config for tests
  globals: {
    'ts-jest': {
      tsconfig: 'tsconfig.test.json'
    }
  },
  testPathIgnorePatterns: [
    '<rootDir>/.next/',
    '<rootDir>/node_modules/',
    '<rootDir>/e2e/',
    '<rootDir>/src/app/api/__tests__/setup.ts',
  ],
  collectCoverageFrom: [
    'src/**/*.{js,jsx,ts,tsx}',
    '!src/**/*.d.ts',
    '!src/**/*.stories.{js,jsx,ts,tsx}',
    '!src/**/index.{js,jsx,ts,tsx}',
  ],
  coverageThreshold: {
    global: {
      branches: 70,
      functions: 70,
      lines: 70,
      statements: 70,
    },
  },
  moduleNameMapper: {
    // Handle module aliases (if you use them in your project)
    '^@/(.*)$': '<rootDir>/src/$1',
    '^@/components/(.*)$': '<rootDir>/src/components/$1',
    '^@/data/(.*)$': '<rootDir>/src/data/$1',
    '^@/utils/(.*)$': '<rootDir>/src/utils/$1',
    '^@/types/(.*)$': '<rootDir>/src/types/$1',
  },
  testMatch: [
    '<rootDir>/src/**/__tests__/**/*.{js,jsx,ts,tsx}',
    '<rootDir>/src/**/*.{test,spec}.{js,jsx,ts,tsx}',
    '<rootDir>/__tests__/**/*.{js,jsx,ts,tsx}',
  ],
  transform: {
    '^.+\\.(js|jsx|ts|tsx)$': ['babel-jest', { presets: ['next/babel'] }],
  },
  transformIgnorePatterns: [
    '/node_modules/(?!(react-syntax-highlighter)/)',
    '^.+\\.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)