{
  description = "NixOS configuration";

  inputs = {
    # nixpkgs Unstable Inputs
    nixpkgs-unstable.url = "github:nixos/nixpkgs/nixos-unstable";
    home-manager-unstable.url = "github:nix-community/home-manager";
    home-manager-unstable.inputs.nixpkgs.follows = "nixpkgs-unstable";

    # for darwin
    nixpkgs-darwin.url = "github:nixos/nixpkgs/nixpkgs-21.11-darwin";
    home-manager-darwin.url = "github:nix-community/home-manager/release-21.11";
    home-manager-darwin.inputs.nixpkgs.follows = "nixpkgs-darwin";
    nix-darwin.url = "github:lnl7/nix-darwin/master";
    nix-darwin.inputs.nixpkgs.follows = "nixpkgs-darwin";

    deploy-rs.url = "github:serokell/deploy-rs";
    deploy-rs.inputs.nixpkgs.follows = "nixpkgs-unstable";

    musicutil.url = "gitlab:ChaotiCryptidz/musicutil";
    musicutil.inputs.nixpkgs.follows = "nixpkgs-unstable";
  };

  outputs = { ... }@inputs: import ./outputs.nix inputs;
}