jest.config.js

module.exports = {
  // 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/react/cleanup-after-each",
  //   "@testing-library/jest-dom/extend-expect"
  // ],

  // 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: {
    "\\.(jpg|jpeg|png|gif|eot|otf|webp|svg|ttf|woff|woff2|mp4|webm|wav|mp3|m4a|aac|oga)$": "<rootDir>/__mocks__/fileMock.ts",
    "\\.(css|less)$": "identity-obj-proxy"
  }

};