$ npm run watch # -> "tsc -p tsconfig.json -w"
$ npm run dev # -> "nodemon index.js"起两个服务，通过 npm run watch 实现将 ts 实时转为 js，通过 npm run dev 启动真正的 node 服务脚本
[nodemon] 1.19.4
[nodemon] to restart at any time, enter `rs`
[nodemon] watching dir(s): *.*
[nodemon] watching extensions: js,mjs,json
[nodemon] starting `node index.js`
但是这样会在开发中产生中间文件
其实 nodemon 可以直接起 ts 文件，利用 ts-node 的能力（如果报错，尝试模块内或者全局安装下 ts-node 和 typescript 两个包）
$ npm run dev-ts[nodemon] 1.19.4
[nodemon] to restart at any time, enter `rs`
[nodemon] watching dir(s): *.*
[nodemon] watching extensions: ts,json
[nodemon] starting `ts-node index.ts`