Why is NODE_ENV not working?

Question

Node.js

Hey! Recently started to understand webpack. I saw about such a thing as "process.env.NODE_ENV" .
I write to the console

webpack --define process.env.NODE_ENV="development"

But when I write it console.log(process.env.NODE_ENV);displays undefined
Why and how to use NODE_ENV correctly?
PS In the console I wrote not only the above representations option, but also
webpack NODE_ENV="development"
webpack env.NODE_ENV="development"

SET NODE_ENV="development"
webpack

Answer 1

First you need to define an environment variable:

NODE_ENV=development webpack --config webpack.config.js