Committing your node_modules folder is definitely a bad idea. To me, the right answer is to use Yarn's "offline mirror" feature to cache the package tarballs t

Committing your node_modules folder is definitely a bad idea. To me, the right answer is to use Yarn's "offline mirror" feature to cache the package tarballs themselves in your repo. They're smaller, it's a lot fewer files, and it's platform independent.