jest.config.js

module.exports = {
  testEnvironment: 'jsdom',
  collectCoverageFrom: [
    '**/*.{js,jsx,ts,tsx}',
    '!**/*.d.ts',
    '!**/node_modules/**',
    '!**/.yarn/**',
    '!**/.next/**',
    '!**/cypress',
  ],
  testMatch: [
    '<rootDir>/__tests__/**/?(*.)+(spec|test).[jt]s?(x)',
    '<rootDir>/src/**/?(*.)+(spec|test).[jt]s?(x)',
  ],
  moduleNameMapper: {
    // Handle CSS imports (with CSS modules)
    // https://jestjs.io/docs/webpack#mocking-css-modules
    '^.+\\.module\\.(css|sass|scss)$': 'identity-obj-proxy',

    // Handle CSS imports (without CSS modules)
    '^.+\\.(css|sass|scss)$': '<rootDir>/__mocks__/styleMock.js',

    // Handle image imports
    // https://jestjs.io/docs/webpack#handling-static-assets
    '^.+\\.(jpg|jpeg|png|gif|webp|svg)$': `<rootDir>/__mocks__/fileMock.js`,

    // Handle module aliases
    '^__tests__/(.*)$': '<rootDir>/__tests__/$1',
    '^pages/(.*)$': '<rootDir>/pages/$1',
    '^src/(.*)$': '<rootDir>/src/$1',
  },
  setupFilesAfterEnv: [
    '<rootDir>/jest.setup.ts',
    'jest-plugin-context/setup',
  ],
  testPathIgnorePatterns: [
    '<rootDir>/node_modules/',
    '<rootDir>/.yarn/',
    '<rootDir>/.next/',
    '<rootDir>/cypress/',
  ],
  transform: {
    // Use babel-jest to transpile tests with the next/babel preset
    // https://jestjs.io/docs/configuration#transform-objectstring-pathtotransformer--pathtotransformer-object
    '^.+\\.(js|jsx|ts|tsx)$': ['babel-jest', { presets: ['next/babel'] }],
    '^.+\\.(md|mdx)$': 'jest-transformer-mdx/cra',
  },
  transformIgnorePatterns: [
    '/node_modules/',
    '/.yarn/',
    '/.next/',
    '^.+\\.module\\.(css|sass|scss)$',
    'cypress',
    '.storybook',

    'config.js',
    'coverage',

    '_document.tsx',
    '_app.tsx',
    '_error.tsx',
    '404.tsx',
    '500.tsx',
  ],
  coveragePathIgnorePatterns: [
    '/node_modules/',
    '/.yarn/',
    '/.next/',
    '^.+\\.module\\.(css|sass|scss)$',
    'cypress',
    '.storybook',

    '.config.',
    'coverage',
    '/stories/',
    
    '_document.tsx',
    '_app.tsx',
    '_error.tsx',
    '404.tsx',
    '500.tsx',
  ],
  coverageThreshold: {
    global: {
      branches: 100,
      functions: 100,
      lines: 100,
      statements: 100,
    },
  },
}