like title says, I can not install font awesome 5 with npm for scss purposes.
Accoring to https://fontawesome.com/how-to-use/use-wi
My understanding of FontAwesome 5 is that they use javascript to add inline SVGs to the DOM.
Take a look at this article: SVG with JS
Rather than compiling an scss file, you just need to include this javascipt one: fontawesome-all.js, any icons you add to your HTML should then be converted to SVGs automatically.