sway on nixos

  wayland.windowManager.sway = {
    enable = true;
    config = {
      modifier = "Mod4";
      menu = "rofi -show run";
      terminal = "alacritty";
      keybindings =
        let
          modifier = config.wayland.windowManager.sway.config.modifier;
          menu     = config.wayland.windowManager.sway.config.menu;
        in lib.mkOptionDefault {
          "${modifier}+Alt+x" = menu;
        };
    };
  };