如何使用异步将错误传递回调用者函数？

Question

如果没有找到刚刚将空对象发送回客户端的“dateofBirth”，我现在会抛出错误，我如何将错误对象而不是空对象传递回客户端。基本上是想发回进程catch

main.ts

export class GetSpecialtyQuestionsController extends Controller {
        public static async process(@Request() request: ExpressRequest,
            response: ExpressResponse): Promise < any > {
            try {
                const instance = new GetSpecialtyQuestionsController();
                const data = await instance.execute(request);
                response.status(200);
                response.send(data);
            } catch (err) {
                response.status(200);
                response.send(err.message);
            }

        }

        // private _request: IRequestURL[] = [];

        constructor() {
            super();
        }

        private async execute(@Request() request: ExpressRequest): Promise < any > {
            // const specialtyMembers = this.getSpecialtyMemberInfoFakeObject();
            const specialtyMembers = await new SpecialtyCacheUtility().getSpecialtyMemberInfoCache(
                request.body.getSpecialtyQuestionsRequest.header.serviceContext.tokenID);
            if (!specialtyMembers) {
                return this.errorHandler(request);
            }
            let proxyMember: ISpecialtyInfoObj = {}
            as ISpecialtyInfoObj;
            for (const member of specialtyMembers) {
                if (member.specialtyIdEnc === request.body.getSpecialtyQuestionsRequest.details.specialtyIdEnc) {
                    proxyMember = member;
                    if (!member.dateOfBirth) {
                        throw new Error('no patient info for given HBS ID');
                    }
                    break;
                }
            }

        }

Answer 1

创建自定义异常对象以在抛出错误时传递数据

class CustomError extends Error {
  constructor(foo = 'bar', ...params) {
    // Pass remaining arguments (including vendor specific ones) to parent constructor
    super(...params);

    // Maintains proper stack trace for where our error was thrown (only available on V8)
    if (Error.captureStackTrace) {
      Error.captureStackTrace(this, CustomError);
    }

    // Custom debugging information
    this.foo = foo;
    this.date = new Date();
  }
}

try {
  throw new CustomError('baz', 'bazMessage');
} catch(e){
  console.log(e.foo); //baz
  console.log(e.message); //bazMessage
  console.log(e.stack); //stacktrace
}

更多参考来自官方 mdn 文档 - https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error