{ pkgs, system }:
let
  denoShelf = import ./deno {
    inherit pkgs system;
    # collective hash of all (relevant) deno sources
    # mapped to resulting shared deno cache hash
    knownDenoHashes = {
      "2JQI9Ie/fkl5Ltr22BGJynF9tFc=" =
        "sha256-7csbrTbGd6J4a0Gkj9ndKhNxv90KeOHjr7DDNal3L4Q=";
    };
  };
  
  shelfSetup = pkgs.writeShellScript "setup-shelf" ''
    export DENO_DIR=$PWD/.deno_cache
    rm -rf $DENO_DIR
    cp -r ${denoShelf.cache} $DENO_DIR
    chmod -R u+w "$DENO_DIR"

    # TODO: add other interpreters
  '';
in
{
  setupScript = shelfSetup;
}