Import the index.css file on top of your application entry javascript file.
Then these font family names will be available:
IRANSansUltraLight
IRANSansLight
IRANSansMedium
IRANSansBold
IRANSans
npm install libj-iransans
import 'libj-iransans'
or
import 'libj-iransans/index.css'
IRANSansUltraLight
IRANSansLight
IRANSansMedium
IRANSansBold
IRANSans