{
  description = "Music downloader";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";

    npm-buildpackage.url = "github:serokell/nix-npm-buildpackage";
    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs = { self, nixpkgs, npm-buildpackage, flake-utils, ... }: flake-utils.lib.eachDefaultSystem (system: let
    pkgs = import nixpkgs { inherit system; overlays = [(final: prev: {
      inherit (final.callPackage "${npm-buildpackage}" { nodejs = final.nodejs-14_x; }) mkNodeModules buildNpmPackage buildYarnPackage;
    })]; };
  in {
    packages.mudl = pkgs.buildNpmPackage {
      src = ./.;
      buildInputs = [ pkgs.makeWrapper ];
      postInstall = ''
        chmod +x $out/index.js
        makeWrapper $out/index.js $out/bin/mudl --prefix PATH : ${nixpkgs.lib.makeBinPath (with pkgs; [ yt-dlp imagemagick sacad id3v2 ])}
        rm $out/bin/npm
      '';
    };

    defaultPackage = self.packages.${system}.mudl;

    apps.mudl = {
      type = "app";
      program = "${self.packages.${system}.mudl}/bin/mudl";
    };

    defaultApp = self.apps.${system}.mudl;
  });
}