Patched version of Yarn 1.x
Yarn stores extracted versions of packages on its global cache directory, and then copies the extracted files to your project folder.
Rather than doing a copy, we made it so that it would try to hardlink the file, giving you considerable storage savings if you're working with multiple project with the same kind of dependencies.
This does not work the same way as pnpm however where it uses a CAS, you can
get relatively the same amount of saving by running dupe-krill on
the cache directory. Caution is advised.