typescript - 箭头函数的类型转换

Question

我想将回调函数类型转换为另一种类型。例如， express 。

//definitions.ts
interface ExtendedRequest extends express.Request{
    user:IUser;
}
interface ExtendedRequestHandler{
    (req:ExtendedRequest, res:express.Response, next:express.NextFunction):any;
}
//app.ts
import * as D from './definitions';
...
// if i use with 'function' keyword it works
app.post('/login', <D.ExtendedRequestHandler>function(req,res){/*..*/});
//but if i try casting on anonymous arrow function, it doesnt work,
//i am getting error ',' expected
app.post('/login', <D.ExtendedRequestHandler>(req,res)=>{/*..*/});

有没有办法在箭头函数上应用类型转换？

谢谢..

Answer 1

TypeScript 认为您在尝试以这种方式编写通用箭头函数。您只需添加一些括号即可消除混淆:

app.post('/login', <D.ExtendedRequestHandler>((req,res)=>{/*..*/}));