jest.config.js

// 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
/** @type {import('jest').Config} */
const customJestConfig = {
  // Add more setup options before each test is run
  // setupFilesAfterEnv: ['<rootDir>/jest.setup.js'],
  // if using TypeScript with a baseUrl set to the root directory then you need the below for alias' to work
  moduleDirectories: ['node_modules', '<rootDir>/'],
  modulePathIgnorePatterns: ['<rootDir>/.vercel/'],
  testEnvironment: 'jest-environment-jsdom',
  collectCoverageFrom: ['src/**/*.{js,jsx,ts,tsx}', '!src/**/*.d.ts'],
  testMatch: [
    '<rootDir>/**/__tests__/**/*.{js,jsx,ts,tsx}',
    '<rootDir>/**/*.{spec,test}.{js,jsx,ts,tsx}',
  ],
  moduleNameMapper: {
    '\\.(css|less)$': 'identity-obj-proxy',
  },
  transformIgnorePatterns: [
    '[/\\\\]node_modules[/\\\\].+\\.(js|jsx|ts|tsx)$',
    '^.+\\.module\\.(css|sass|scss)$',
  ],
  // "transform": {
  //   "^.+\\.(js|jsx|ts|tsx)$": "<rootDir>/node_modules/babel-jest",
  //   "^.+\\.css$": "<rootDir>/config/jest/cssTransform.js",
  //   "^(?!.*\\.(js|jsx|ts|tsx|css|json)$)": "<rootDir>/config/jest/fileTransform.js"
  // },
}

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