{inputs, ...} @ args: {
  nixpkgs.channels = {
    default = {
      overlays = [(import ./overlays.nix args)];
      config.allowUnfree = true;
    };

    # nixpkgs
    pkgs = {
      source = inputs.nixpkgs;
      overlays = [
        (import ./overlays.nix args)
      ];
      config.allowUnfree = true;
    };

    # nixpkgs-unstable
    upkgs = {
      source = inputs.nixpkgs-unstable;
      overlays = with inputs; [
        cachyos.overlays.pinned
        millennium.overlays.default

        (import ./overlays.nix args)
      ];

      config.allowUnfree = true;
    };

    # nixpkgs-staging
    spkgs = {
      source = inputs.nixpkgs-staging;
      overlays = [
        (import ./overlays.nix args)
      ];
      config.allowUnfree = true;
    };
  };
}