This forum covers all Gentoo-related software not officially supported by Gentoo. Ebuilds/software posted here might harm the health and stability of your system(s), and are not supported by Gentoo developers. Bugs/errors caused by ebuilds from overlays.gentoo.org are covered by this forum, too.
Playing with this now myself. Is there a not stupid way to create & install an actual binary, instead of using npm start to kick it off? So far the only thing I've found is to just extract the .deb file (either direct from GitHub or make it myself) and copy the executable over to /usr/local/bin, but that's kind of hokey.