/**
 * Cache Middleware
 * Provides response caching for server adapters
 */
import type { CacheEntry, MiddlewareDefinition, ServerCacheConfig } from "../../types/index.js";
import type { CacheStore } from "../../types/index.js";
/**
 * Cache entry
 */
/**
 * Cache store interface
 */
/**
 * In-memory LRU cache store
 */
export declare class InMemoryCacheStore implements CacheStore {
    private cache;
    private accessOrder;
    private maxSize;
    constructor(maxSize?: number);
    get(key: string): Promise<CacheEntry | undefined>;
    set(key: string, entry: CacheEntry): Promise<void>;
    delete(key: string): Promise<void>;
    clear(): Promise<void>;
    private updateAccessOrder;
}
/**
 * Create cache middleware
 *
 * Response headers set by this middleware:
 * - `X-Cache`: "HIT" if served from cache, "MISS" if freshly generated
 * - `X-Cache-Age`: Seconds since the response was cached (only on HIT)
 * - `Cache-Control`: Caching directive with max-age (only on MISS)
 *
 * @example
 * ```typescript
 * const cacheMiddleware = createCacheMiddleware({
 *   ttlMs: 60 * 1000, // 1 minute
 *   methods: ["GET"],
 *   excludePaths: ["/api/health"],
 * });
 *
 * server.registerMiddleware(cacheMiddleware);
 * ```
 */
export declare function createCacheMiddleware(config: ServerCacheConfig): MiddlewareDefinition;
/**
 * Create a cache invalidation helper
 */
export declare function createCacheInvalidator(store: CacheStore): {
    invalidate: (pattern: string) => Promise<void>;
    clear: () => Promise<void>;
};
/**
 * Generic LRU (Least Recently Used) Cache
 *
 * Provides a simple in-memory cache with LRU eviction policy.
 *
 * @example
 * ```typescript
 * const cache = new LRUCache<string, number>(100);
 *
 * cache.set("key1", 42);
 * cache.get("key1"); // => 42
 * cache.has("key1"); // => true
 * cache.delete("key1");
 * ```
 */
export declare class LRUCache<K, V> {
    private cache;
    private accessOrder;
    private maxSize;
    constructor(maxSize?: number);
    /**
     * Get a value from the cache
     */
    get(key: K): V | undefined;
    /**
     * Set a value in the cache
     */
    set(key: K, value: V): void;
    /**
     * Check if a key exists in the cache
     */
    has(key: K): boolean;
    /**
     * Delete a key from the cache
     */
    delete(key: K): boolean;
    /**
     * Clear the cache
     */
    clear(): void;
    /**
     * Get the current size of the cache
     */
    get size(): number;
    private updateAccessOrder;
}
/**
 * Synchronous response cache store with TTL support
 *
 * Designed for caching HTTP responses with automatic expiration.
 *
 * @example
 * ```typescript
 * const store = new ResponseCacheStore(100, 60000); // 100 entries, 60s TTL
 *
 * store.set("GET:/api/users", { status: 200, data: [...] });
 * const cached = store.get("GET:/api/users");
 *
 * // Invalidate specific key
 * store.invalidate("GET:/api/users");
 *
 * // Invalidate by pattern (e.g., all user endpoints)
 * store.invalidateByPattern("/api/users");
 * ```
 */
export declare class ResponseCacheStore<T = unknown> {
    private cache;
    private ttlMs;
    constructor(maxSize?: number, ttlMs?: number);
    /**
     * Get a value from the cache
     */
    get(key: string): T | undefined;
    /**
     * Set a value in the cache
     */
    set(key: string, value: T, ttlMs?: number): void;
    /**
     * Check if a key exists and is not expired
     */
    has(key: string): boolean;
    /**
     * Invalidate (delete) a specific key
     */
    invalidate(key: string): boolean;
    /**
     * Invalidate all keys matching a pattern (substring match or regex)
     * @param pattern - String to match or RegExp
     */
    invalidateByPattern(pattern: string | RegExp): number;
    /**
     * Invalidate all keys matching a pattern (substring match or regex)
     * @param pattern - String to match or RegExp
     */
    invalidatePattern(pattern: string | RegExp): number;
    /**
     * Clear the entire cache
     */
    clear(): void;
    /**
     * Get the current size of the cache
     */
    get size(): number;
}