/*! Copyright (c) 2024, XAPP AI */
/**
 * Determines if the provided URL has a certain file extension.  This is useful to filter out undesirable URLs to follow such as .pdf, .jpg, .png or other file types that don't have hyperlinks themselves.
 *
 * It assumes that a URL without an extension is HTML.
 *
 * @param url
 * @param extension
 */
export declare function hasExtension(url: string | URL, extension: string | string[]): boolean;