export declare const SITEMAP_CACHE_DEFAULTS: {
    sharedMaxAge: number;
    staleWhileRevalidate: number;
};
export interface SitemapCacheOptions {
    sharedMaxAge: number;
    staleWhileRevalidate: number;
}
export interface SitemapCacheDecision {
    surrogateKey: string;
    cacheControl: string;
}
export declare function resolveSitemapCacheOptions(options?: Partial<SitemapCacheOptions>): SitemapCacheOptions;
export declare function buildSitemapCacheHeaders({ apiUrl, options }: {
    apiUrl?: string;
    options: SitemapCacheOptions;
}): SitemapCacheDecision;
export declare function buildCustomSitemapCacheHeaders({ options }: {
    options: SitemapCacheOptions;
}): SitemapCacheDecision;