jest

jest.config.js

module.exports = {
	globals: {
		'ts-jest': {
			tsConfigFile: 'tsconfig.json'
		}
	},
	moduleFileExtensions: [
		'ts',
		'js'
	],
	transform: {
		'^.+\\.(ts|tsx)$': './node_modules/ts-jest/preprocessor.js'
	},
	testMatch: [
		'**/test/**/*.test.(ts|js)'
	],
	testEnvironment: 'node',
	setupFiles: [
		// "<rootDir>/test/setup.js"
  ],
  setupTestFrameworkScriptFile: '<rootDir>/test/setup.ts'
};

package.json

 "jest": {
    "preset": "react-native",
    "setupFiles": [
      "<rootDir>/tests/setup.js"
    ],
    "transform": {
      "^.+\\.(js|jsx)?$": "<rootDir>/node_modules/babel-jest",
      "^.+\\.(ts|tsx)?$": "<rootDir>/node_modules/ts-jest/preprocessor.js"
    },
    "testRegex": "/tests/src/.*.spec.(js|tsx|ts)?$",
    "transformIgnorePatterns": [
      "/node_modules/(?!native-base)/"
    ],
    "moduleFileExtensions": [
      "ts",
      "tsx",
      "js",
      "jsx",
      "json"
    ],
    "moduleNameMapper": {
      ".+\\.(css|styl|less|sass|scss|png|jpg|ttf|woff|woff2)$": "identity-obj-proxy"
    }
  },