{
  lib,
  inputs,
  ...
} @ args: {
  nixpkgs.channels = rec {
    # base
    base = npkgs;

    # nixpkgs-stable
    npkgs = {
      source = inputs.nixpkgs;
      overlays = [
        inputs.dobutterfliescry-net.overlays.default
        (import ./overlays args)
      ];
      config = {
        allowBroken = false;
        allowUnfreePredicate = pkg:
          builtins.elem (lib.getName pkg) [
            "discord"
            "steam"
            "steamcmd"
            "steam-unwrapped"
            "spotify"

            "obsidian"
            "gitkraken"
            "via"
          ];
      };
    };

    # nixpkgs-unstable
    upkgs = {
      source = inputs.nixpkgs-unstable;
      overlays = [
        inputs.millennium.overlays.default
        (import ./overlays args)
      ];
      config = {
        allowUnfree = false;
        allowBroken = false;
      };
    };

    # nixpkgs-master
    mpkgs = {
      source = inputs.nixpkgs-master;
      overlays = [];
      config = {
        allowUnfree = false;
        allowBroken = false;
      };
    };
  };
}