Cant find output of buildCrystalPackage

I am trying to build a derivation of my crystal project and everything works flawlessly including the tests, but when i look into the resulting derivation only license and readme file have made it.

{ pkgs ? import (fetchTarball "https://github.com/NixOS/nixpkgs/archive/a7ecde854aee5c4c7cd6177f54a99d2c1ff28a31.tar.gz") { }
}:

pkgs.crystal.buildCrystalPackage rec {
  pname = "dmnd-bot";
  version = "0.2.0";
  src = builtins.path { path = ./.; name = pname; };
  
  format = "crystal";

  shardsFile = ./shards.nix;
  
  buildInputs = [
    pkgs.openssl
  ];

  postPatch = ''
    substituteInPlace spec/syncplay_bot_spec.cr \
        --replace 'syncplay' '${pkgs.syncplay}/bin/syncplay'    
  '';
  
  checkInputs = [
    pkgs.syncplay
  ];
}

the output of this derivation looks like this:

$  ls /nix/store/7q8gk4gqk4lnkq16blmjg7m0jnbbxjxg-dmnd-bot-0.2.0
share

Am I missing something?

oops now that i look at it like that it’s obviously the wrong format. should be format = "shards";