nixos/system/plasma.nix

{ pkgs, username, ... }:
{
  environment.plasma6.excludePackages = with pkgs.kdePackages; [
    plasma-browser-integration
    konsole
    kate
  ];
  services = {
    displayManager = {
      autoLogin.user = username;
      sddm = {
        enable = true;
        wayland.enable = true;
      };
    };
    desktopManager.plasma6 = {
      enable = true;
      enableQt5Integration = true;
    };
  };
}