javascript - RESTful API 中的 Typescript 自定义错误

Question

我从另一个项目中截取了一段代码，其中存在 RESTful API 中的自定义错误。这一切都工作得很好，直到我将其重构为 typescript 。我不明白错误构造器是如何工作的，并且 this.response 在此范围内不知道。

我如何抛出此错误

async function authenticate(request, response, next) {
    if(!request.body.email) {
        return next(new ErrorREST(Errors.BadRequest, "User name missing."));
    }
}

error.js

const Errors = {
  BadRequest: {
    status: 400,
    message: "Request has wrong format."
  },
  Unauthorized: {
    status: 401,
    message: "Authentication credentials not valid."
  },
  Forbidden: {
    status: 403,
    message: "You're missing permission to execute this request."
  }
}

class ErrorREST extends Error {
  constructor(type, detail = undefined, ...args) {
    super(...args);

    if (typeof type !== 'object') {
      return new Error("You need to provide the error type.");
    }

    this.response = type;

    if (detail !== undefined) {
      this.response.detail = detail;
    }
  }
}

我还没有找到类似的解决方案。该解决方案提供了预定义的错误以及附加的自定义消息。

Answer 1

JavaScript 在您调用它时创建 this.response。所以我创建了这个字段并且 typecript 知道它。

第二个问题是，我在错误处理后在 app.ts 中定义了路线。

错误.ts

const Errors = {
  BadRequest: {
    status: 400,
    message: "Request has wrong format."
  },
  Unauthorized: {
    status: 401,
    message: "Authentication credentials not valid."
  },
  Forbidden: {
    status: 403,
    message: "You're missing permission to execute this request."
  }
}

export class ErrorREST extends Error {
   public response: { status: number; message: string; detail: string };

    constructor(error: { status: number, message: string }, detail: string = undefined, ...args) {
       super(...args);
       this.response = {status: error.status, message: error.message, detail: detail};
   }
}

app.ts

 this.express.use('/api/users', usersRouter);

 this.express.use(function (error, request, response, next) {

      logRequest(console.error, request);
      console.error("ERROR OCCURRED:");
      console.error(error);

   if (error == null || error.response == null) {//error is not a custom error
      error = new ErrorREST(Errors.InternalServerError);
   } 

   response.status(error.response.status).send(error.response);

将错误返回给用户

return next(new ErrorREST(Errors.Unauthorized));
return next(new ErrorREST(Errors.Unauthorized), "Authentication credentials not valid.");