Typescript 扩展了 Express 请求主体

Question

我有以下内容：

const fff = async (req: express.Request, res: express.Response): Promise<void> => {...}

我如何声明它req.body.xxx存在？那么当我输入时req.body.xxx它会知道它存在于该req.body对象上吗？

Answer 1

定义您的Request类型，该类型扩展express.Request并且您可以设置请求正文类型：

interface ILoginBody {
  username: string;
  password: number;
}

interface ILoginRequest extends Request {
  body: ILoginBody;
}

// use ILoginRequest instead of express.Request
const fff = async (req: ILoginRequest, res: Response): Promise<void> => {
  const { username, password } = req.body; // body now is an ILoginBody
}