import type { CacheBackend, CacheConfig } from './types';
/**
 * In-memory cache implementation using node-cache
 */
export declare class MemoryCacheBackend implements CacheBackend {
    private cache;
    constructor(config?: {
        maxKeys?: number;
        defaultTTL?: number;
        checkPeriod?: number;
    });
    get<T>(key: string): Promise<T | null>;
    set(key: string, value: unknown, ttl?: number): Promise<void>;
    delete(key: string): Promise<void>;
    has(key: string): Promise<boolean>;
    clear(): Promise<void>;
}
/**
 * Redis cache implementation (lazy-loaded only if configured)
 */
export declare class RedisCacheBackend implements CacheBackend {
    private client;
    private connected;
    constructor(config: NonNullable<CacheConfig['redis']>);
    get<T>(key: string): Promise<T | null>;
    set(key: string, value: unknown, ttl?: number): Promise<void>;
    delete(key: string): Promise<void>;
    has(key: string): Promise<boolean>;
    clear(): Promise<void>;
}
/**
 * Initializes the cache system with configuration
 */
export declare function initializeCache(config: CacheConfig): void;
/**
 * Get the current cache backend
 */
export declare function getCacheBackend(): CacheBackend;
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