|                    |  | {  inputs = {    utils.url = "github:numtide/flake-utils";  };
  outputs = { self, nixpkgs, utils }:    utils.lib.eachDefaultSystem (system:      let        pkgs = nixpkgs.legacyPackages."${system}";      in rec {       devShell = pkgs.mkShell {          nativeBuildInputs = with pkgs; [            yarn            nodejs-14_x            nodePackages.typescript-language-server            nodePackages.eslint          ];        };      });}
 |