export const isBase64 = (str: string) => {
  const withoutPrefix = str?.split(',')[1];
  const base64Regex = /^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=)?$/;

  return base64Regex.test(withoutPrefix);
};