{
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
    flutter-nix.url = "github:maximoffua/flutter.nix/stable"; # remove `/stable` to use main branch
          # stable can be replaced with specific tag matching Flutter versions, e.g. 3.16.7
  };
 
  outputs = { self, flutter-nix }:
  let
    system = "x86_64-linux";
    pkgs = import nixpkgs {
      inherit system;
      # add overlay from flutter-nix, which replaces dart and flutter packages
      overlays = [
        flutter.nix.overlays.default
      ];
    };
  in {
    # Use flutter-nix in your outputs or use `pkgs`,
    # which is nixpkgs for the system, with flutter.nix's overlay applied.

    packages.flutter = flutter-nix.packages.${system}.flutter;
  };
}

# devenv.nix
{
  pkgs,
  inputs,
  ...
}: {
  languages.dart.enable = true;
  languages.dart.package = pkgs.flutter;

  enterShell = ''
    flutter --version
  '';
}

# devenv.nix
{
  pkgs,
  inputs,
  ...
}: let
  system = pkgs.stdenv.system;
  flutter = inputs.flutter-nix.packages.${system}.flutter;
in {
  languages.dart.enable = true;
  languages.dart.package = flutter;

  enterShell = ''
    flutter --version
  '';
}