{
  description = "Flake for ActivityPuppy";
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-23.05";
    flake-utils.url = "github:numtide/flake-utils";
  };
  outputs = { nixpkgs, flake-utils, ... }: 
    flake-utils.lib.eachDefaultSystem  (system: let 
        pkgs = import nixpkgs { inherit system; };
        hs-env = pkgs.haskell.packages.ghc944.extend (final: prev: {});
        hs-ghc = hs-env.ghcWithPackages
          (hspkgs: with hspkgs; [
            aeson
            base64
            bytestring
            cryptonite
            cryptostore
            effectful
            effectful-th
            hspec
            http-conduit
            QuickCheck
            sqlite-simple
            text
            uuid
            wai
            warp
          ]);
      in rec {
        packages.default = hs-env.callPackage ./package.nix {};
        apps.default = {
          type = "app";
          program = "${packages.default}/bin/kaos-api";
        };
        devShell = pkgs.mkShell {
          buildInputs = [
            hs-ghc
            hs-env.cabal-install
            pkgs.haskell.packages.ghc944.haskell-language-server
            pkgs.sqlite
          ];
        };
      });
}