漫柯heaven
给了
好评
讲的很不错，有ts就好了
```
"devDependencies": {
"@types/koa": "^2.0.48",
"@types/koa-router": "^7.0.41",
"@types/node": "^12.0.10",
"nodemon": "^1.19.1",
"ts-node": "^8.3.0",
"typescript": "^3.5.2"
}
```
```
import * as Koa from "koa";
import * as Router from "koa-router";
```