reac-native + typescript 的环境搭建

一. RN-TS环境搭建
. 安装RN脚手架
yarn add create-react-native-app -g
yarn global add typescript 
. 创建项目文件夹
create-react-native-app RN-TS
. 进入文件夹
cd RN-TS    
. 安装包
yarn add typescript tslint @types/react @types/react-native @types/react-dom -D
. 在项目目录下运行 tsc --init命令生成tsconfig.json文件
将原内容删掉，替换为以下内容
{
    "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
}

. 安装yarn add concurrently rimraf react-native-script -D，之后将以下代码替换掉package.json下的scripts的语句
  "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 "

. 将package.json中的main设置为：
./node_modules/react-native-scripts/build/bin/crna-entry.js

. 将App.js里的内容替换为
import App from './build/App'
export default App

. 在项目下新建src目录，并把babel.config.js放在src文件夹下

. 在src下新建一个App.tsx文件拷入以下代码，然后运行yarn buildAndStart
import React, { Component } from "react"
import { View, Text } from "react-native"

export default class App extends Component {
  render() {
    return(
      <View>
        <Text>hello</Text>
      </View>
    )
  }
}
11. 打开你手机端的expo软件扫描出现的二维码，如果手机上出现hello，说明环境搭建成功了