After struggling with this for a while I came up with this procedure (based on Font Awesome's documentation here):
As stated, you'll have to install fontawesome, react-fontawesome and fontawesome icons library:
npm i --save @fortawesome/fontawesome-svg-core
npm i --save @fortawesome/free-solid-svg-icons
npm i --save @fortawesome/react-fontawesome
and then import everything to your React app:
import { library } from '@fortawesome/fontawesome-svg-core'
import { FontAwesomeIcon } from '@fortawesome/react-fontawesome'
import { faStroopwafel } from '@fortawesome/free-solid-svg-icons'
library.add(faStroopwafel)
Here comes the tricky part:
To change or add icons, you'll have to find the available icons in your node modules library,
i.e.
<your_project_path>\node_modules\@fortawesome\free-solid-svg-icons
Each icon has two relevant files: .js and .d.ts, and the file name indicates the import phrase (pretty obvious...), so adding angry, gem and check-mark icons looks like this:
import { faStroopwafel, faAngry, faGem, faCheckCircle } from '@fortawesome/free-solid-svg-icons'
library.add(faStroopwafel, faAngry, faGem, faCheckCircle)
To use the icons in your React js code, use:
<FontAwesomeIcon icon=icon_name/>
The icon name can be found in the relevant icon's .js file:
e.g. for faCheckCircle look inside faCheckCircle.js for 'iconName' variable:
...
var iconName = 'check-circle';
...
and the React code should look like this:
<FontAwesomeIcon icon=check-circle/>
Goodluck!