jest.config.js

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

  // 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: [
    '<rootDir>/jest.setup.ts'
  ],

  testMatch: null,

  // 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'],

  testPathIgnorePatterns: ['<rootDir>/.next/', '<rootDir>/node_modules/'],

  preset: 'ts-jest',
  globals: {
    'ts-jest': {
      tsconfig: 'tests/tsconfig.json',
    },
  },
}