text: export function isValidHostname(value) {
    if (typeof value !== 'string') return false;
  
    const validHostnameChars = /^[a-zA-Z0-9-.]{1,253}\.?$/g;
    if (!validHostnameChars.test(value)) {
      return false;
    }
  
    if (value.endsWith('.')) {
      value = value.slice(0, value.length - 1);
    }
  
    if (value.length > 253) {
      return false;
    }
  
    const labels = value.split('.');
    const isValid = labels.every(function(label) {
      const validLabelChars = /^([a-zA-Z0-9-]+)$/g;
  
      const validLabel =
        validLabelChars.test(label) &&
        label.length < 64 &&
        !label.startsWith('-') &&
        !label.endsWith('-');
  
      return validLabel;
    });
  
    return isValid;
  }
  