/**
 * @module indicative-rules
 */
/**
 * Tells whether given input is a valid url or not
 *
 * @example
 * ```
 *   // Following yields to true
 *   http://foo.com
 *   https://foo.com
 *   http://localhost
 *   http://foo.co.in
 * ```
 */
export declare const url: (input: string) => boolean;