How do I use fs in JsFunction

[ivanfjz]

This is my codes:

$page->on('response', JsFunction::createWithParameters(['response','fs'])->body("
                if(response.url().indexOf('img.xxxx.com') > -1){
                    let responseUrl = response.url();
                    const imgbuffer = await response.buffer();
                    fs.writeFileSync(img_path, imgbuffer);
                }
            ")->async(true)->scope(['img_path' => $img_path]));

it alert fs is undefined