/**
 * Discovers URLs from HTML content, a sitemap, or a starting URL.
 *
 * @param htmlContent - Optional HTML content to parse for links.
 * @param baseUrl - The base URL for resolving relative links found in HTML.
 * @param sourceUrlOrPath - The original source (starting URL or sitemap path/URL).
 * @param useSitemap - Flag indicating whether to prioritize fetching and parsing a sitemap.
 * @returns A promise resolving to an array of discovered absolute URLs.
 */
export declare function discoverUrls(htmlContent: string | null, baseUrl: string, sourceUrlOrPath: string, useSitemap?: boolean): Promise<string[]>;
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