If you make Feature Requests they might add Zig to nixmodules so they can update and support it properly and conveniently, independently from replit-nixpkgs, but I don’t think there’s too much demand for it, especially from professional, paying users (and so there’s not even syntax highlighting yet). plus Rust is better 
Here a template. Caveats:
- doesn’t take semver into account when checking for updates, so code breaks (
0.11.0
doesn’t satisfy^0.10.2) - Takes 416 MiB! If there’s a way to compare the installed version to the current nix version and then store only the differences, that’d be the best way to reduce it