trying to stream line ai response and I have this error “getReader() is not a function”

Hi everyone I’m trying to streamline the ai response and I get this error on my function, anyone have any idea on how to fix it?

  let result;
  try {
    const response = await REQUEST({
      method: 'POST',
      url: CHATBOT_NEW,
      data: data,
      auth: true,
    });
    console.log('+++response.data+++', response.data);
    const reader = response?.data?.getReader(); // here is the bug
    let chunks = '';

    while (true) {
      const { done, value } = await reader?.read();
      if (done) {
        console.log('Completed fetching data');
        break;
      }
      chunks += new TextDecoder('utf-8').decode(value);
    }

    result = chunks;
  } catch (error) {
    console.log(error);
  }
  console.log('+++result+++', result);
  return result;
}; ```