There is a different project called z:

https://github.com/rupa/z

I’d never heard of it but it was the first search result for “z github”.

Or the pure zsh version, which is superior, since it eliminates a ton of forking by eliminating calls to external tools (the original z script relies heavily on awk, sort, date, sed, mv, rm, and chown). There are also significant stability improvements to the database thanks to proper locking.

https://github.com/agkozak/zsh-z