{
  outputs = { self, nixpkgs, flake-utils }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = import nixpkgs { inherit system; };
        flakePkgs = { main = pkgs.ocamlPackages.callPackage ./. { }; };
      in {
        devShell = pkgs.mkShell {
          inputsFrom = with flakePkgs; [ main ];
          packages = (with pkgs; [ ]) ++ (with pkgs.ocamlPackages; [ocaml-lsp ppxlib
          alcotest
          yojson
          ezjsonm
          ]);
        };
      });
}