1  /**
 2   * Returns the number (integer) of DNS domain levels (number of dots) in the
 3   * hostname.
 4   *
 5   * Examples:
 6   *
 7   * ``` js
 8   * dnsDomainLevels("www")
 9   *   // returns 0.
10   * dnsDomainLevels("www.netscape.com")
11   *   // returns 2.
12   * ```
13   *
14   * @param {String} host is the hostname from the URL.
15   * @return {Number} number of domain levels
16   */
17  export default function dnsDomainLevels(host: string): number;