jest.config.js

module.exports = {
  verbose: true,
  // The root of your source code, typically /src
  // `<rootDir>` is a token Jest substitutes
  roots: ['<rootDir>/src'],

  // Jest transformations -- this adds support for TypeScript
  // using ts-jest
  transform: {
    '^.+\\.tsx?$': 'ts-jest',
  },

  // Runs special logic, such as cleaning up components
  // when using React Testing Library and adds special
  // extended assertions to Jest
  setupFilesAfterEnv: [
    '@testing-library/jest-dom/extend-expect',
    //'@testing-library/react/cleanup-after-each'
  ],

  // Test spec file resolution pattern
  // Matches parent folder `__tests__` and filename
  // should contain `test` or `spec`.
  testRegex: ['(/__tests__/.*|(\\.|/)(test|spec))\\.tsx?$'],

  // Module file extensions for importing
  moduleFileExtensions: ['ts', 'tsx', 'js', 'jsx', 'json', 'node'],

  moduleNameMapper: {
    '^.+\\.(css|less|scss)$': 'identity-obj-proxy',
  },
}