How to set NODE_ENV?

Question

JavaScript

How to correctly set NODE_ENV in the script described in the file package.json?

...
"scripts": {
    "build": "NODE_ENV=production webpack --config ./webpack.prod.config.js --progress --colors",
    "start": "node ./app.js"
  },
...

I try to run it npm run build, but it gives me that

"NODE_ENV" не является внутренней или внешней
командой, исполняемой программой или пакетным файлом.

Answer 1

// Linux
...
"scripts": {
    "build": "export NODE_ENV=production webpack --config ./webpack.prod.config.js --progress --colors",
    "start": "node ./app.js"
  },
...
// Windows
...
"scripts": {
    "build": "set NODE_ENV=production webpack --config ./webpack.prod.config.js --progress --colors",
    "start": "node ./app.js"
  },
...

Answer 2

and you didn't forget to do it

npm install