/**
 * Joins a base origin with a pathname or absolute URL into a sitemap `<loc>` value.
 *
 * @remarks
 * Trailing slashes are stripped except for the site root (`/`). Absolute `http(s)`
 * URLs in `extraUrls` are returned as-is (still slash-normalized).
 */
export declare function buildSitemapLocation(baseUrl: string, pathnameOrUrl: string): string;
/**
 * Renders a sitemap.org 0.9 urlset document from absolute location URLs.
 *
 * @remarks
 * Callers are responsible for deduplication; this serializer preserves input order.
 */
export declare function renderSitemap(locations: readonly string[]): string;