nixos-config/components/gui/wayland.nix

{ config, pkgs, lib, ... }:
with lib;
{

  options.components.gui.wayland.enable = mkOption {
    type = lib.types.bool;
    default = !config.components.gui.xorg.enable;
  };

  config = mkIf (config.components.gui.wayland.enable && config.components.gui.enable) {
    programs.sway.enable = false;
  };
}