TypeScript

package.json

{
  "name": "todo",
  "version": "0.0.1",
  "private": true,
  "scripts": {
    "start": "node node_modules/react-native/local-cli/cli.js start",
    "test": "jest"
  },
  "dependencies": {
    "babel-plugin-module-resolver": "^3.1.1",
    "react": "16.6.0-alpha.8af6728",
    "react-native": "0.57.4",
    "react-test-renderer": "^16.6.0",
    "redux": "^4.0.1",
    "redux-observable": "^1.0.0",
    "rxjs": "^6.3.3"
  },
  "devDependencies": {
    "@types/jest": "^23.3.9",
    "@types/react": "^16.4.18",
    "@types/react-native": "^0.57.7",
    "@types/react-test-renderer": "^16.0.3",
    "jest": "^23.6.0",
    "metro-react-native-babel-preset": "^0.49.0",
    "react-native-typescript-transformer": "^1.2.10",
    "ts-jest": "^23.10.4",
    "typescript": "^3.1.6"
  },
  "jest": {
    "preset": "react-native",
    "moduleFileExtensions": [
      "ts",
      "tsx",
      "js"
    ],
    "transform": {
      "^.+\\.js$": "<rootDir>/node_modules/react-native/jest/preprocessor.js",
      "\\.(ts|tsx)$": "ts-jest"
    },
    "testRegex": "(/__tests__/.*|\\.(test|spec))\\.(ts|tsx|js)$",
    "testPathIgnorePatterns": [
      "\\.snap$",
      "<rootDir>/node_modules/"
    ],
    "cacheDirectory": ".jest/cache"
  }
}