Installing fontawesome in Webpack on WordPress

1. Install fontawsome in theme

npm install --save @fortawesome/fontawesome-free

2. Import fontawesome js files in /src/js/app.js

import '@fortawesome/fontawesome-free/js/fontawesome'
import '@fortawesome/fontawesome-free/js/solid'
import '@fortawesome/fontawesome-free/js/regular'
import '@fortawesome/fontawesome-free/js/brands'

3. import fontawesome css

@import "@fortawesome/fontawesome-free/css/all.css";