在ReactNative中使用Typescript

---

少俠放心，跟着我的這個步驟走，保你完美在RN項目中使用Typescript，廢話不多說，走你

1.全局安裝create-react-native-app

yarn global add create-react-native-app

2.創建項目

create-react-native-app projectname(你的項目名字)

3.cd到你的項目文件夾中
4.安裝typescript依賴

yarn add typescript tslint -D
yarn add @types/react @types/react-native @types/react-dom -D

5.安裝其他依賴

yarn add concurrently rimraf -D
yarn add ts-jest @types/jest @types/react-test-renderer -D

6.在你的項目根目錄下創建一個tsconfig.json文件,將以下代碼復制進去即可

{
    "compilerOptions": {
        "module":"es2015",
        "target": "es2015",
        "jsx": "react",
        "rootDir": "src",
        "outDir": "build",
        "allowSyntheticDefaultImports": true,
        "noImplicitAny": true,
        "sourceMap": true,
        "experimentalDecorators": true,
        "preserveConstEnums": true,
        "allowJs": true,
        "noUnusedLocals": true,
        "noUnusedParameters": true,
        "noImplicitReturns": true,
        "skipLibCheck": true,
        "moduleResolution":"Node"
    },
    "filesGlob": [
        "typings/index.d.ts",
        "src/**/*.ts",
        "src/**/*.tsx",
        "node_modules/typescript/lib/lib.es6.d.ts"
    ],
    "types": [
      "react",
      "react-dom",
      "react-native"
    ],
    "exclude":[
        "build", 
        "node_modules",
        "jest.config.js",
        "App.js"
        
    ],
    "compileOnSave": false
}

7.安裝react-native-scripts

yarn add react-native-scripts

8.將package.json中的"scripts"配置清空，並將以下代碼替換

"scripts": {
    "start": "react-native-scripts start",
    "eject": "react-native-scripts eject",
    "android": "react-native-scripts android",
    "ios": "react-native-scripts ios",
    "test": "node node_modules/jest/bin/jest.js",
    "lint": "tslint src/**/*.ts",
    "tsc": "tsc",
    "clean": "rimraf build",
    "build": "yarn run clean && yarn run tsc --",
    "watch": "yarn run build -- -w",
    "watchAndRunAndroid": "concurrently \"yarn run watch\" \"yarn run android\"",
    "buildRunAndroid": "yarn run build && yarn run watchAndRunAndroid ",
    "watchAndRunIOS": "concurrently \"yarn run watch\" \"yarn run ios\"",
    "buildRunIOS": "yarn run build && yarn run watchAndRunIOS ",
    "watchAndStart": "concurrently \"yarn run watch\" \"yarn run start\"",
    "buildAndStart": "yarn run build && yarn run watchAndStart "
  }

9.將package.json中的"main"配置清空，並將以下代碼替換

"main": "./node_modules/react-native-scripts/build/bin/crna-entry.js"

10.將App.js中代碼清空，並將以下代碼替換

import App from './build/App';
export default App;

11.創建一個src文件夾，將babel.config.js文件放在src文件夾下，同時在src文件夾下創建一個App.tsx文件，App.tsx文件中代碼如下

import React, { Component } from "react"
import { View, Text } from "react-native"

export default class App extends Component {
  render() {
    return(
      <View>
        <Text>不成功加我qq:291678978，手把手教學好吧</Text>
      </View>
    )
  }
}

12.執行命令：yarn buildAndStart，然后靜靜的等待運行成功，用你偉大的expo掃描成功的二維碼就可以看到偉大的勝利；注：如果想在瀏覽器看到你的二維碼，可再單獨執行一下yarn start

---

然后就可以很開心的在項目里寫TypeScript代碼了，例如項目中tsx目錄下有test.tsx文件，我們在import這個文件時，就像import一個js文件就可以了(注：ts文件后綴名ts和tsx都可以，不過在當前環境下后綴名寫成ts好像有問題，如果有問題的話將后綴名改成tsx即可，親測有效)

import './tsx/test'