{
  pkgs ? import (builtins.getFlake (toString ./.)).inputs.nixpkgs { },
  someArg ? null,
  shellHook ? ''
    echo "Executing shellHook."
  '',
}:
pkgs.mkShellNoCC {
  inherit shellHook;

  nativeBuildInputs = [ pkgs.hello ];
  SHOULD_BE_SET = someArg;

  passthru = {
    subshell = pkgs.mkShellNoCC { THIS_IS_A_SUBSHELL = "OK"; };
  };
}