node.js - 类型错误 : Cannot read property 'prototype' of undefined React Express

Question

我有一个项目使用 Express 和 React，一切正常，

我没有对代码进行任何更改，突然它开始出现此错误。

前几天，我已经将node从10.15.0升级到12.x，并添加了axios。

我在这些更改之后进行了测试，它有效。现在不行了，这是什么意思？？

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

Answer 1

我发现我输入错误

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。当我删除该行时，问题解决了。

编辑: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 本身还是另一个 VS code 自动完成扩展。