lib.nixosSystem not listed

[katexochen]

What happened
function can't be found via noogle

Steps to Reproduce
https://noogle.dev/q?term=lib.nixosSystem

[hsjobeki]

This function is a bit complicated though it (was) documented as well.

It doesn't exist in lib of nixpkgs

nix-repl> lib.nixosSystem
error: attribute 'nixosSystem' missing
       at «string»:1:1:
            1| lib.nixosSystem

One can only use it via flakes:

https://github.com/NixOS/nixpkgs/blob/master/flake.nix#L57

inputs.nixpkgs.lib.nixosSystem

Although i think it should be possible to discover this function via noogle, this is a new category of functions, which can be used via flakes exclusively and is not part of the "standard" library