少侠放心，跟着我的这个步骤走，保你完美在RN项目中使用Typescript，废话不多说，走你
1.全局安装create-react-native-app
yarn globaladd create-react-native-app
2.创建项目
create-react-native-app projectname(你的项目名字)
3.cd到你的项目文件夹中
4.安装typescript依赖
yarnadd typescript tslint -Dyarnadd @types/react @types/react-native @types/react-dom -D
5.安装其他依赖
yarnadd concurrently rimraf -Dyarnadd ts-jest @types/jest @types/react-test-renderer -D
6.在你的项目根目录下创建一个tsconfig.json文件,将以下代码复制进去即可
{"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.安装react-native-scripts
yarnadd react-native-scripts
8.将package.json中的"scripts"配置清空，并将以下代码替换
"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.将package.json中的"main"配置清空，并将以下代码替换
"main":"./node_modules/react-native-scripts/build/bin/crna-entry.js"
10.将App.js中代码清空，并将以下代码替换
importAppfrom'./build/App';exportdefaultApp;
11.创建一个src文件夹，将babel.config.js文件放在src文件夹下，同时在src文件夹下创建一个App.tsx文件，App.tsx文件中代码如下
importReact, {Component} from"react"import{View,Text} from"react-native"exportdefaultclassAppextendsComponent{ render() {return( 不成功加我qq:291678978，手把手教学好吧 ) }}
12.执行命令：yarn buildAndStart，然后静静的等待运行成功，用你伟大的expo扫描成功的二维码就可以看到伟大的胜利；注：如果想在浏览器看到你的二维码，可再单独执行一下yarn start
然后就可以很开心的在项目里写TypeScript代码了，例如项目中tsx目录下有test.tsx文件，我们在import这个文件时，就像import一个js文件就可以了(注：ts文件后缀名ts和tsx都可以，不过在当前环境下后缀名写成ts好像有问题，如果有问题的话将后缀名改成tsx即可，亲测有效)
import'./tsx/test'