What could be the problem when running webpack-dev-server?

Question

Node.js

Hello!
When working with webpack, a not entirely clear problem appeared, namely:
when running npm run start:dev, an error occurs like -
https://pastebin.com/KsXkKWYA

package.json settings
https://pastebin.com/xB549VW4

webpack.config settings .js
https://pastebin.com/Xwd9Nduk

At the same time, if you use a regular assembly, then everything is OK, the problem is only when using dev-server

Answer 1

1.At you from the console passes?

npx run cross-env NODE_ENV=production webpack-dev-server --open

2. What is your understanding of the usual assembly?
3. You have an extra space in your line.

"build": "cross-env NODE_ ENV=production webpack --mode production"

4. Why do you even need this environment variable? Why doesn't it fit?

"start:dev": "webpack-dev-server --open --mode=development",