Example NixOS flake

flake.nix

{
  description = "example nixos/nix-darwin/home-manager/nix-droid flake";

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
    darwin = {
      url = "github:LnL7/nix-darwin/master";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    home-manager = {
      url = "github:nix-community/home-manager";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    nix-on-droid = {
      url = "github:nix-community/nix-on-droid/release-23.05";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs = inputs@{ self,
                      nixpkgs,
                      darwin,
                      home-manager,
                      nix-on-droid,
                      ... }:
  flake-utils.lib.eachDefaultSystem (system: let
    pkgs = import nixpkgs {
      inherit system;
      config.allowUnfree = true;
    };
    in {
    
    # nixos targets
    packages.nixosConfigurations = {
      nixos-machine-1 = nixpkgs.lib.nixosSystem {
        system = "x86_64-linux";
        specialArgs = inputs;
        modules = [
          ./nixos/hosts/macbook/configuration.nix
          {
          # NixOS configuration goes here
          }
        ];
      };
    };
    
    # macos targets
    packages.darwinConfigurations = {
      "macbook-1" = darwin.lib.darwinSystem {
        system = "aarch64-darwin";
        specialArgs = inputs;
        modules = [
          ./path/to/some/configuration.nix
          {
          # Nix-darwin configuration goes here
          }
        ];
      };
    };    
    
    # home-manager targets (non NixOS/MacOS)
    packages.homeConfigurations = {
      heywoodlh = home-manager.lib.homeManagerConfiguration {
        inherit pkgs;
        modules = [
          ./path/to/home.nix
          {
            # Other configuration goes here
          }
        ];
        extraSpecialArgs = inputs;
      };
    };
    
    packages.nixOnDroidConfigurations = {
      default = nix-on-droid.lib.nixOnDroidConfiguration {
        extraSpecialArgs = inputs;
        modules = [
          ./path/to/droid.nix
          {
          # Nix-droid configuration goes here
          }
        ];
        home-manager-path = home-manager.outPath;
      };
    };
  });
}