WARNING: GPLv3, can be argued that any application using this library must also be GPLv3, if you're serving this library on the internet, your entire application must provide source on request.
I tend to use the following library (MIT License): https://www.npmjs.com/package/mui-icons
Which wraps svg icons in a consistent way, compatible with the mui frameworks. Provides access to several icon libraries including an expanded set of material icons (cmdi).