{
  description = "Kaptan development environment";

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

  outputs = { nixpkgs, ... }:
    let
      systems = [
        "x86_64-linux"
        "aarch64-linux"
      ];
      forAllSystems = nixpkgs.lib.genAttrs systems;
      perSystem = system:
        let
          pkgs = nixpkgs.legacyPackages.${system};
          groundSuite = pkgs.buildNpmPackage {
            pname = "kaptan-ground-suite";
            version = "0.1.0";
            src = ./ground-suite;
            npmDepsHash = "sha256-l217EpOz2oEBQK6bzJV0DSEdBkK7HIlB4a7JMF+FadA=";
            npmBuildScript = "check";
            PLAYWRIGHT_CHROMIUM_EXECUTABLE = "${pkgs.chromium}/bin/chromium";
            installPhase = ''
              runHook preInstall
              mkdir -p $out/libexec/ground-suite
              cp -R dist node_modules src public scripts tests package.json package-lock.json tsconfig.json tsconfig.app.json vite.config.ts vitest.config.ts playwright.config.ts $out/libexec/ground-suite/
              runHook postInstall
            '';
          };
          groundSuiteCommand = pkgs.writeShellApplication {
            name = "ground-suite";
            runtimeInputs = [ pkgs.nodejs pkgs.coreutils pkgs.chromium ];
            text = ''
              suite_root=${groundSuite}/libexec/ground-suite
              if [ "''${1:-}" = test ]; then
                shift
                test_root=$(mktemp -d -t kaptan-ground-suite-test.XXXXXX)
                trap 'rm -rf "$test_root"' EXIT
                cp -R "$suite_root" "$test_root/suite"
                chmod -R u+w "$test_root/suite"
                cd "$test_root/suite"
                export PLAYWRIGHT_CHROMIUM_EXECUTABLE=${pkgs.chromium}/bin/chromium
                npm test -- "$@"
                exit $?
              fi
              exec node "$suite_root/scripts/server.mjs" "$@"
            '';
          };
        in { inherit pkgs groundSuite groundSuiteCommand; };
    in
    {
      packages = forAllSystems (system:
        let values = perSystem system; in {
          ground-suite = values.groundSuite;
          default = values.groundSuite;
        });

      apps = forAllSystems (system:
        let values = perSystem system; in {
          ground-suite = {
            type = "app";
            program = "${values.groundSuiteCommand}/bin/ground-suite";
          };
        });

      checks = forAllSystems (system:
        let values = perSystem system; in {
          ground-suite = values.groundSuite;
        });

      devShells = forAllSystems (system:
        let
          pkgs = nixpkgs.legacyPackages.${system};
          python = pkgs.python3.withPackages (pythonPackages: with pythonPackages; [
            pymavlink
            pyserial
          ]);
        in
        {
          default = pkgs.mkShell {
            packages = [
              pkgs.rustup
              pkgs.dfu-util
              pkgs.mdbook
              pkgs.flutter
              python
            ];
          };
          ground-suite = pkgs.mkShell {
            packages = [ pkgs.nodejs ];
            shellHook = ''
              echo "Kaptan Ground Suite development shell (Node $(node --version), npm $(npm --version))"
              echo "Run: cd ground-suite && npm ci && npm run dev"
              echo "SIMULATED DATA ONLY"
            '';
          };
        });
    };
}