Or maybe just read the commits between now and a reasonable date far enough in the past so that if there is some hostile code injected before that point in time, then at least you will share the walk of shame with a lot of people and you can play the sound of "who could have guessed?"
dns_snek|5 months ago
kpcyrd|5 months ago
https://whatsrc.org/
It doesn't index all of npm, only if the package was reference by a Linux distribution somehow (e.g. package-lock.json in a tar file used in an Arch Linux PKGBUILD).