nix-config/modules/home/cli/mu.nix

{
  flake.modules.homeManager.mu = {
    config,
    lib,
    ...
  }:
    with lib; let
      cfg = config.home.cli.mu;
    in {
      options.home.cli.mu.enable = mkEnableOption "Enable mu";
      config.programs.mu.enable = cfg.enable;
    };
}