{
  description = "gsmol: browser client for Smol Mail — bridge package and NixOS module";

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

  outputs = { self, nixpkgs }:
    let
      systems = [ "x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin" ];
      forEachSystem = f: nixpkgs.lib.genAttrs systems (system: f nixpkgs.legacyPackages.${system});
    in
    {
      packages = forEachSystem (pkgs: {
        default = pkgs.callPackage ./nix/bridge.nix { };
      });

      apps = forEachSystem (pkgs: {
        default = {
          type = "app";
          program = pkgs.lib.getExe self.packages.${pkgs.stdenv.hostPlatform.system}.default;
        };
      });

      # Curried on `self` so the module's default package is drawn from the
      # `packages` output above rather than a second, driftable copy.
      nixosModules.default = import ./nix/module.nix self;
    };
}