{ 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 ]; }; }); }