{ config, lib, pkgs, ... }: { imports = [ ]; options.me = { wasm.enable = lib.mkOption { type = lib.types.bool; default = false; example = true; description = "Whether we want to install wasm."; }; }; config = lib.mkIf config.me.wasm.enable ( lib.mkMerge [ { environment.systemPackages = with pkgs; [ wabt wasm-bindgen-cli binaryen # for wasm-opt ]; } ] ); }