Issues with getting started with webpack 4

Question

I am following the tutorial exactly as given here . But I am amazed that the docs seems outdated. e.g

npx webpack src/index.js dist/bundle.js fails with

Answer 1

In webpack config file:

const isProd = process.env.NODE_ENV === 'production';
module.exports = {
  ***
  mode: isProd ? 'production' : 'development'
  ***
};

In package.json:

***
"scripts": {
   "dev": "node ./app.js",
   "prod": "cross-env NODE_ENV=production npm run dev",
   ***
},
***
"dependencies": {
   "cross-env": "^7.0.2",
   ***
}
***