jest.config.js

// For a detailed explanation regarding each configuration property, visit:
// https://jestjs.io/docs/en/configuration.html

module.exports = {
  // An array of glob patterns indicating a set of files for which coverage information should be collected
  collectCoverageFrom: ['**/*.{ts,tsx}', '!**/*.d.ts'],

  // An array of file extensions your modules use
  moduleFileExtensions: ['ts', 'tsx', 'js', 'json', 'jsx', 'node'],

  // A map from regular expressions to module names or to arrays of module names that allow to stub out resources with a single module
  moduleNameMapper: {
    '^.+\\.module\\.(css|sass|scss)$': 'identity-obj-proxy',
  },

  // A list of paths to modules that run some code to configure or set up the testing framework before each test
  setupFilesAfterEnv: ['@testing-library/jest-dom/extend-expect'],

  // An array of regexp pattern strings that are matched against all test paths, matched tests are skipped
  testPathIgnorePatterns: ['/node_modules/', '/.next/'],

  // A map from regular expressions to paths to transformers
  transform: {
    '^.+\\.[jt]sx?$': 'babel-jest',
  },

  // An array of regexp pattern strings that are matched against all source file paths, matched files will skip transformation
  transformIgnorePatterns: [
    '/node_modules/',
    '^.+\\.module\\.(css|sass|scss)$',
  ],

  // This option allows you to use a custom watch plugins
  watchPlugins: [
    'jest-watch-typeahead/filename',
    'jest-watch-typeahead/testname',
  ],
}