Expo typescript starter with expo router

Specification

• react-native
• expo
• expo-router
• typescript
• localization
• emotion
• dooboo-ui
• ts-jest
• @testing-library/react-native
• @testing-library/react-hooks
• react-hook
• prettier

Gain points

1. Sample of context-api with `react-hook` (`useContext`).
2. Know how to structure react native app with typescript.
3. Know how to navigate between screens with `expo-router`.
4. Know how to write test code with `testing-library`.
5. Know how to `lint` your project with `eslint` for both `ts` and maybe some `js`.
6. Know how to localize your project.

INSTALL

npm install && npm start
// or
yarn && yarn start

Structures

app/
├─ .doobooo // necessary if using dooboo-cli
├─ .expo
├─ assets
│  └─ icons // app icons
│  └─ images // app images like background images
├─ app/
├─ assets/
├─ node_modules/
├─ src/
│  └─ apis
│  └─ components
│     └─ navigations
│     └─ screen
│     └─ shared
│  └─ contexts
│  └─ utils
├─ test/
├─ .buckconfig
├─ .flowconfig
├─ .gitattributes
├─ .gitignore
├─ .watchmanconfig
├─ app.json
├─ babel.config.js
├─ index.js
├─ jest.config.js
├─ package.json
├─ README.md
├─ STRINGS.js
├─ tsconfig.json
└─ tslint.json

Running the project

Running the project is as simple as running

npm run start

This runs the start script specified in our package.json, and will spawn off a server which reloads the page as we save our files. Typically the server runs at http://localhost:8080, but should be automatically opened for you.

Testing the project

Testing is also just a command away:

npm test

Result

> yarn test

PASS  test/app/index.test.tsx (6.378 s)
PASS  test/src/uis/Button.test.tsx
PASS  test/app/temp.test.tsx
PASS  src/apis/__tests__/sample.test.ts

Test Suites: 4 passed, 4 total
Tests:       18 passed, 18 total

Writing tests with Jest

We've created test examples with jest-ts in test dir. We organize the tests as organized in flutter repo. This way we know where the test files exist.

Localization

We've defined Localization strings in STRINGS.ts which is in root dir. We used expo-localization for translation.

import * as Localization from 'expo-localization';
import i18n from 'i18n-js';

// import en from './assets/langs/en.json';
const en = {
  HELLO: 'Hello',
  LOGIN: 'Login',
  EMAIL: 'Email',
  PASSWORD: 'Password',
  SIGNUP: 'SIGN UP',
  FORGOT_PW: 'Forgot password?',
  NAVIGATE: 'Navigate',
  CHANGE_THEME: 'Change theme',
};

// import ko from './assets/langs/ko.json';
const ko = {
  HELLO: '안녕하세요',
  LOGIN: '로그인',
  EMAIL: '이메일',
  PASSWORD: '패스워드',
  SIGNUP: '회원가입',
  FORGOT_PW: '비밀번호를 잊어버리셨나요?',
  NAVIGATE: '이동하기',
  CHANGE_THEME: '테마변경',
};

i18n.fallbacks = true;
i18n.translations = { en, ko };
i18n.locale = Localization.locale;

export const getString = (param: string, mapObj?: object) => {
  if (mapObj) {
    i18n.t(param, mapObj);
  }
  return i18n.t(param);
};