export interface PersistentCacheOptions {
    storage?: 'file' | 'memory';
    path?: string;
    ttl?: number;
    maxSize?: number;
    autoSave?: boolean;
    saveInterval?: number;
}
export declare class PersistentCache {
    private cache;
    private readonly storage;
    private readonly filePath?;
    private readonly ttl;
    private readonly maxSize;
    private readonly autoSave;
    private saveTimer?;
    private dirty;
    constructor(options?: PersistentCacheOptions);
    get(key: string): Promise<any | null>;
    set(key: string, value: any, ttl?: number): Promise<void>;
    delete(key: string): Promise<boolean>;
    has(key: string): Promise<boolean>;
    clear(): Promise<void>;
    getStats(): Promise<{
        size: number;
        maxSize: number;
        storage: string;
        hits: number;
        oldestEntry?: number;
        newestEntry?: number;
    }>;
    private evictLRU;
    private ensureCacheDirectory;
    private load;
    private save;
    cleanup(): Promise<number>;
    destroy(): void;
}
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