TypeError: Cannot read properties of undefined (reading 'prototype') React Typescript + Express

user_13536950 0
Viewed 31262

I'm trying to use express at my React-Typescript SPA. But It's giving me the error:

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

I've tried adding target: "node" to my "node_modules/react-scripts/config/webpack.config.js" But it won't work...

Here's some ways I've already tried to solve it:

    import express from "express";
    app = express();
---------------
    import express from "express";
    let app: express.Application;
    app = express();
-------------

    import express from "express";
    let app: any;
    app = express();

-------------
    const express require("express");
    let app: express.Application;
    app = express();
typescript reactjs express javascript
2 Answers

You have to instantiate both the app and express, use the const keyword as well.

const express = require('express');
const app = express();

Also, look for anywhere in your code base where you have:

import { response } from 'express';

Often this is put in by mistake and removing this line may solve the error

user_169743590

Faced same issue

it was imported under

import e from "express";

not sure cuz of any random IntelliSense extension or maybe the GH copilot auto-completion

user_123528180
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