/**
 * @module indicative-rules
 */
/**
 * Validates an input string against the phone number regex. Checkout
 * [libphonenumber](https://www.npmjs.com/package/libphonenumber-js)
 * If looking for a battle tested phone number validation with
 * country codes.
 *
 * @example
 * ```js
 * const { is } = require('indicative')
 *
 * is.phone('9999999999')    // true
 * is.phone('999-999-9999')  // true
 * is.phone('999.999.9999')  // true
 * ```
 */
export declare const phone: (input: string) => boolean;