/**
 * Cache service for QBOMCP-TS
 */
import { ICacheService } from '../types';
/**
 * In-memory cache with optional file persistence
 */
export declare class CacheService implements ICacheService {
    private cache;
    private readonly maxSize;
    private readonly defaultTTL;
    private readonly persistPath?;
    private cleanupInterval?;
    constructor();
    /**
     * Generate cache key from input
     */
    private generateKey;
    /**
     * Calculate size of value in bytes
     */
    private calculateSize;
    /**
     * Get value from cache
     */
    get<T>(key: string): Promise<T | null>;
    /**
     * Set value in cache
     */
    set<T>(key: string, value: T, ttl?: number): Promise<void>;
    /**
     * Delete value from cache
     */
    delete(key: string): Promise<void>;
    /**
     * Clear entire cache
     */
    clear(): Promise<void>;
    /**
     * Evict least recently used entry
     */
    private evictLRU;
    /**
     * Clean up expired entries
     */
    private cleanup;
    /**
     * Load cache from disk
     */
    private loadFromDisk;
    /**
     * Save cache to disk
     */
    private saveToDisk;
    /**
     * Get cache statistics
     */
    getStats(): {
        size: number;
        maxSize: number;
        hitRate: number;
        totalHits: number;
        totalSize: number;
    };
    /**
     * Shutdown cache service
     */
    shutdown(): Promise<void>;
}
export declare const cacheService: CacheService;
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