Express 无法读取属性'；上下文'；未定义图形的定义

我正在使用Typescript、Express、TypeORM、GraphQL和TypeGraphQL构建一个允许用户登录的小应用程序

但是，当我在GraphQL游乐场上点击我的测试查询

bye

时，我得到：

Cannot read property 'context' of undefined
"TypeError: Cannot read property 'context' of undefined",
            "    at new exports.isAuth // isAuth is a JS file I wrote

MyContext.js

import { Request, Response } from "express";

export interface MyContext {
  req: Request;
  res: Response;
  payload?: { userId: string };
}

import { MiddlewareFn } from "type-graphql";
import { verify } from "jsonwebtoken";
import { MyContext } from "./MyContext";

export const isAuth: MiddlewareFn<MyContext> = ({ context }, next) => {
  const authorization = context.req.headers["authorization"];

  if (!authorization) {
    throw new Error("not authorized");
  }
...

isAuth.js

import { Request, Response } from "express";

export interface MyContext {
  req: Request;
  res: Response;
  payload?: { userId: string };
}

import { MiddlewareFn } from "type-graphql";
import { verify } from "jsonwebtoken";
import { MyContext } from "./MyContext";

export const isAuth: MiddlewareFn<MyContext> = ({ context }, next) => {
  const authorization = context.req.headers["authorization"];

  if (!authorization) {
    throw new Error("not authorized");
  }
...

我不确定为什么文件

isAuth.js

中的

上下文未定义，原因是：

1） 进入
/tsconfig.json

2） 将
“目标”：“es5”
更改为
“目标”：“es6”
阿米丽特的本·阿瓦德？