{ pkgs, ... }:
let
  useLix = true;
  # nix eval --inputs-from . nixpkgs#lixPackageSets --apply builtins.attrNames --json
  lixPkgs = if pkgs.stdenv.isDarwin then pkgs.lixPackageSets.latest else pkgs.lixPackageSets.stable;
in
# enables switching all lix/nix dependencies at once
if useLix then lixPkgs else pkgs