类型错误:无法读取未定义的 React Express 的属性“原型" [英] TypeError: Cannot read property 'prototype' of undefined React Express

问题描述

我有一个项目使用 Express 和 react，一切正常，

I have a project uses Express and react, Everything was working fine,

我没有对代码进行任何更改突然开始出现此错误.

I didn't make any changes to the code suddenly it starts to give this error.

前几天把node从10.15.0升级到12.x，加了Axios.

In the previous days, I have upgraded node from 10.15.0 to 12.x and added Axios.

我在这些更改后进行了测试，并且可以正常工作.现在没有了，这是什么意思??

I tested after those changes and it works. now it does not, what this mean??

TypeError: Cannot read property 'prototype' of undefined
(anonymous function)
C:/Desktop/ahmad/client/node_modules/express/lib/response.js:42
  39 |  * @public
  40 |  */
  41 | 
> 42 | var res = Object.create(http.ServerResponse.prototype)
  43 | 
  44 | /**
  45 |  * Module exports.
*/

View compiled
./node_modules/express/lib/response.js
http://localhost:3000/static/js/bundle.js:28181:30
__webpack_require__
C:/.../ahmad/client/webpack/bootstrap 4501180ca3adc0d915c0:678
  675 | };
  676 | 
  677 | // Execute the module function
> 678 | modules[moduleId].call(module.exports, module, module.exports, hotCreateRequire(moduleId));
  679 | 
  680 | // Flag the module as loaded
  681 | module.l = true;
View compiled
fn
C:/.../ahmad/client/webpack/bootstrap 4501180ca3adc0d915c0:88
  85 |      console.warn("[HMR] unexpected require(" + request + ") from disposed module " + moduleId);
  86 |      hotCurrentParents = [];
  87 |  }
> 88 |  return __webpack_require__(request);
  89 | };
  90 | var ObjectFactory = function ObjectFactory(name) {
  91 |  return {
View compiled
./node_modules/express/lib/express.js
C:/.../Desktop/ahmad/client/node_modules/express/lib/express.js:22
  19 | var Route = require('./router/route');
  20 | var Router = require('./router');
  21 | var req = require('./request');
> 22 | var res = require('./response');
  23 | 
  24 | /**
  25 |  * Expose `createApplication()`.
*/
View compiled
__webpack_require__
C:/.../Desktop/ahmad/client/webpack/bootstrap 4501180ca3adc0d915c0:678
  675 | };
  676 | 
  677 | // Execute the module function
> 678 | modules[moduleId].call(module.exports, module, module.exports, hotCreateRequire(moduleId));
  679 | 
  680 | // Flag the module as loaded
  681 | module.l = true;
View compiled
fn
C:/.../Desktop/ahmad/client/webpack/bootstrap 4501180ca3adc0d915c0:88
  85 |      console.warn("[HMR] unexpected require(" + request + ") from disposed module " + moduleId);
  86 |      hotCurrentParents = [];
  87 |  }
> 88 |  return __webpack_require__(request);
  89 | };
  90 | var ObjectFactory = function ObjectFactory(name) {
  91 |  return {
View compiled

推荐答案

我发现我打错了

从 { 'express' } 导入响应

我发现当您尝试在前端调用后端内容时会发生此问题.当我删除那行问题解决了.

I found that this problem happens when you try to call backEnd stuff in your frontEnd. when I delete that line problem solved.

原来我没有输入import语句，因为我使用了response这个词作为变量名，它是自动导入的.我不确定导入是来自 React 本身还是其他 VS 代码自动完成扩展.

it turns out that I didn't type the import statement because I used the word response as a variable name, it was automatically imported. I'm not sure if the import was from React itself or another VS code auto-completion extension.

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