Study purpose only
touch webpack.config.js (edit on vscode) or cat > webpack.config.js (keep typing) const path = require('path'); ... Ctrl + D
mkdir src mkdir public mkdir js cat > main.js __ npm i webpack webpack-cli @babel/core @babel/preset-react babel-loader --save-dev -E (E = exact version) __ cat > index.html
npm i react react-dom --save -E