{
  inputs = {
    stable.url = "github:NixOS/nixpkgs/nixos-20.03";
    unstable.url = "github:NixOS/nixpkgs/nixos-unstable";
  };
  
  outputs = inputs:
  let
    lib = inputs.stable.lib;
    system = "x86_64-linux";
    pkgs = inputs.unstable.legacyPackages.${system};
    externalDeps = [ pkgs.youtube-dl ];
    app = pkgs.poetry2nix.mkPoetryApplication {
      projectDir = ./.;
      propagatedBuildInputs = externalDeps;
    };
    env = pkgs.poetry2nix.mkPoetryEnv { projectDir = ./.; };
  in {
    devShell."${system}" =
      pkgs.mkShell { buildInputs = with pkgs; [ env poetry ] ++ externalDeps; };

    defaultPackage."${system}" = app;
    
    nixosConfiguration = /* опустим для простоты */ { };
    aws-tgytdl = /* опустим для простоты */ { };
  };
}