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{  description = "A functional typescript library for deno.";  inputs = {    nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";    flake-utils.url = "github:numtide/flake-utils";  };  outputs = { self, nixpkgs, flake-utils }:    flake-utils.lib.eachDefaultSystem (system:      let        pkgs = import nixpkgs { inherit system; };        fun = with pkgs; derivation {          inherit system;          name = "fun";          src = ./.;          cp = "${coreutils}/bin/cp";          mkdir = "${coreutils}/bin/mkdir";          builder = "${dash}/bin/dash";          args = [ "-c" "$mkdir $out; $cp $src/*.ts $out;" ];        };        shell = with pkgs; mkShell {          buildInputs = [ deno nodejs jq lcov jujutsu ];        };      in      {        # Packages        packages.fun = fun;        packages.default = fun;        # Shells        devShell = shell;      }    );}