jest.config.js

const { defaults: tsjPreset } = require('ts-jest/presets');

module.exports = {
  ...tsjPreset,
  preset: 'react-native',
  setupFiles: ['./jest/jestSetupFile.js'],
  transform: {
    ...tsjPreset.transform,
    '\\.js$': '<rootDir>/node_modules/react-native/jest/preprocessor.js',
  },
  transformIgnorePatterns: ['node_modules/(?!@react-native|react-native)'],
  globals: {
    'ts-jest': {
      babelConfig: true,
    },
  },
  testRegex: '(/__tests__/.*|(\\.|/)(test|spec))\\.(jsx?|tsx?)$',
  testPathIgnorePatterns: ['/node_modules/', '/e2e'],
  moduleFileExtensions: ['ts', 'tsx', 'js', 'jsx', 'json'],
  moduleNameMapper: {
    '\\.(jpg|jpeg|png|gif|eot|otf|webp|svg|ttf|woff|woff2|mp4|webm|wav|mp3|m4a|aac|oga)$':
      '<rootDir>/jest/assetsTransformer.js',
    '\\.(css|less)$': '<rootDir>/jest/assetsTransformer.js',
  },
  // This is the only part which you can keep
  // from the above linked tutorial's config:
  cacheDirectory: '.jest/cache',
};