final: prev: let
  names = builtins.readDir ./racket-catalog |> final.lib.attrNames;
  byName = self:
    final.lib.map (name: {
      inherit name;
      value = self.callPackage ./racket-catalog/${name} {};
    }) names |>
    final.lib.listToAttrs;
in {
  racket-minimal = final.callPackage ./racket/minimal.nix {};
  racket = final.callPackage ./racket/package.nix {};

  instrumentedFetch = drv: drv.overrideAttrs (afinal: aprev: {
    postFetch = (aprev.postFetch or "") + ''
      printf "FETCH_HASH:%s:FETCH_HASH" "$(\
        ${final.lib.getExe final.nix} --extra-experimental-features "nix-command" \
          hash path --sri "$out")"
    '';
  });

  racketPackages = final.lib.makeScope final.newScope (self: {
    racketInstallHook = self.callPackage ./racket-install-hook.nix {};
    buildRacketPackage = self.callPackage ./build-racket-package.nix {};

    makeRacketEnv = self.callPackage ./make-racket-env.nix {};
  } // (byName self));
}