jest.config.js

module.exports = {
  collectCoverageFrom: ['**/*.{js,jsx,ts,tsx}', '!**/*.config.js'],
  coverageDirectory: '<rootDir>/coverage',
  coveragePathIgnorePatterns: [
    '<rootDir>/node_modules',
    '<rootDir>/lib',
    '<rootDir>/build',
    '<rootDir>/coverage'
  ],
  coverageReporters: ['text', 'html'],
  coverageThreshold: {
    global: {
      branches: 80,
      functions: 80,
      lines: 80,
      statements: 80
    }
  },

  projects: ['<rootDir>/test'],

  globals: {
    'ts-jest': {
      tsconfig: '<rootDir>/tsconfig.json'
    }
  },

  moduleDirectories: ['node_modules', '<rootDir>'],
  // Module file extensions for importing
  moduleFileExtensions: ['ts', 'tsx', 'js', 'jsx'],

  resetMocks: true,

  rootDir: '.',

  // The root of your source code, typically /src
  // `<rootDir>` is a token Jest substitutes
  roots: ['<rootDir>/test'],

  // Test spec file resolution pattern
  // should contain `test` or `spec`.
  testRegex: '(/__tests__/.*|(\\.|/)(test|spec))\\.tsx?$',
  // Jest transformations -- this adds support for TypeScript
  // using ts-jest
  transform: {
    '^.+\\.tsx?$': 'ts-jest'
  }
}