/**
 * @jorvel/ssr — request-keyed HTML cache for ETag-before-render.
 *
 * The default `LruHtmlCache` is an in-memory map with insertion-order eviction
 * and an optional TTL. Replace with a Redis/KV-backed implementation in
 * multi-instance deployments.
 */
export interface HtmlCacheEntry {
    html: string;
    etag: string;
    status: number;
    /** Unix milliseconds at which this entry was stored. */
    storedAt: number;
}
export interface HtmlCache {
    get(key: string): HtmlCacheEntry | undefined | Promise<HtmlCacheEntry | undefined>;
    set(key: string, value: HtmlCacheEntry): void | Promise<void>;
    delete?(key: string): void | Promise<void>;
}
export interface LruHtmlCacheOptions {
    /** Maximum number of entries before eviction. Default 256. */
    max?: number;
    /** Entry TTL in ms. `undefined` keeps entries until evicted by capacity. */
    ttlMs?: number;
}
export declare class LruHtmlCache implements HtmlCache {
    private readonly map;
    private readonly max;
    private readonly ttlMs;
    constructor(opts?: LruHtmlCacheOptions);
    get(key: string): HtmlCacheEntry | undefined;
    set(key: string, value: HtmlCacheEntry): void;
    delete(key: string): void;
    clear(): void;
    get size(): number;
}
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