How to use the pusher-js.Runtime function in pusher-js

const getPusher = (url) => {
  Pusher.logToConsole = true;
  Pusher.Runtime.createXHR = () => {
    const xhr = new XMLHttpRequest();
    xhr.withCredentials = true;

    return xhr;
  };

  const pusher = new Pusher(params.PUSHER_KEY, {
    cluster: params.PUSHER_CLUSTER,
    authEndpoint: url,
    auth: {
      headers: {
        'Content-Type': 'application/json',
        'X-XSRF-TOKEN': Cookies.get('XSRF-TOKEN'),
      },
    },
  });