{inputs, ...} @ args: let
  sharedOverlays = [
    inputs.wa2k.overlays.default
    inputs.millennium.overlays.default
    (import ./overlays args)
  ];
in {
  nixpkgs.channels = rec {
    # base
    base = npkgs;

    # nixpkgs-stable
    npkgs = {
      source = inputs.nixpkgs;
      overlays = [] ++ sharedOverlays;
      config = {
        allowUnfree = true;
        allowBroken = false;
      };
    };

    # nixpkgs-unstable
    upkgs = {
      source = inputs.nixpkgs-unstable;
      overlays = [] ++ sharedOverlays;
      config = {
        allowUnfree = true;
        allowBroken = false;
      };
    };
  };
}