export interface CacheControlOptions {
    /** Public vs private caches. */
    scope?: 'public' | 'private';
    /** max-age (seconds). */
    maxAge?: number;
    /** s-maxage (seconds) — shared (CDN) cache. */
    sMaxAge?: number;
    /** stale-while-revalidate (seconds). Requires `maxAge` or `sMaxAge`. */
    staleWhileRevalidate?: number;
    /** stale-if-error (seconds). */
    staleIfError?: number;
    /** no-store short-circuits. */
    noStore?: boolean;
    /** no-cache short-circuits. */
    noCache?: boolean;
    /** immutable (fingerprinted assets). */
    immutable?: boolean;
    mustRevalidate?: boolean;
}
export declare function cacheControl(opts: CacheControlOptions): string;
/**
 * Compute a weak ETag using FNV-1a 64-bit (much lower collision risk than DJB2).
 * Returned as `W/"<hex>-<len>"`.
 */
export declare function buildWeakEtag(body: string): string;
export declare function ifNoneMatchHit(etag: string, requestHeader?: string): boolean;
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