Typescript 扩展了 Express 请求体。

Question

我有以下内容：

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

如何声明 req.body.xxx 存在？这样当我输入 req.body.xxx 时，它会知道它存在于 req.body 对象中吗？

- T THE R

---

@ThomasSablik 它扩展了 Request 对象。我想要扩展 req.body。 - T THE R

Answer 1

定义你的Request类型，该类型扩展了express.Request，你可以设置请求体类型：

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
}

- hoangdv

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如果req.body与ILoginBody不匹配，服务器会抛出错误吗？ - olawalejuwonm

Answer 2

基于TypeScript定义，这个的正确语法是：

interface Request<
        P = core.ParamsDictionary,
        ResBody = any,
        ReqBody = any,
        ReqQuery = core.Query,
        Locals extends Record<string, any> = Record<string, any>
    > extends core.Request<P, ResBody, ReqBody, ReqQuery, Locals> {}

以下是从上面提取的代码片段，我们在括号内指定请求类型。

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

const fff = async (req: Request<any, Response, ILoginBody>, res: Response): Promise<void> => {
  const { username, password } = req.body;
}

- a_dreb