{
  description = "Home Manager configuration of john";

  inputs = {
    # Specify the source of Home Manager and Nixpkgs.
    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
    home-manager = {
      url = "github:nix-community/home-manager";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs =
    { nixpkgs, home-manager, ... }:
    let
      system = "x86_64-linux";
      pkgs = nixpkgs.legacyPackages.${system};
      lib = pkgs.lib;
      
      # Define the module first (moved from below)
      homeManagerModule = { config, pkgs, ... }: {
        options.user = lib.mkOption {
          type = lib.types.str;
          description = "The username for the Home Manager configuration.";
        };
        imports = [ ./home.nix ];
      };
      
      # Function to create a home configuration for any user
      mkHomeConfiguration = username: home-manager.lib.homeManagerConfiguration {
        inherit pkgs;
        modules = [ homeManagerModule { user = username; } ];
      };
      
      # Default username from the module evaluation
      evaluatedOptions = lib.evalModules { modules = [ homeManagerModule ]; };
      userName = evaluatedOptions.config.user;
    in
    {
      # Default configuration using the default username
      homeConfigurations.${userName} = mkHomeConfiguration userName;
      
      # Export the function so other flakes can create configurations for any user
      lib = { mkHomeConfiguration = username: mkHomeConfiguration username; };
      
      # Export modules for reuse in other flakes
      homeManagerModules.default = homeManagerModule;
    };
}