import { HerdClient } from '../HerdClient.js';
export interface CacheOptions {
    cacheDirectory?: string;
    autoCleanup?: boolean;
}
/**
 * Manages the encrypted cache for trail files
 * This is internal to the TrailEngine and not meant to be accessed directly
 */
export declare class CacheManager {
    private cacheDirectory;
    private client;
    private encryptionKey;
    private keyExpiry;
    /**
     * Creates a new CacheManager instance
     */
    constructor(client: HerdClient, options?: CacheOptions);
    /**
     * Get path to cache directory
     */
    getCacheDirectory(): string;
    /**
     * Store data in the encrypted cache with auto-prefixing
     */
    store(key: string, data: string | Buffer): Promise<string>;
    /**
     * Retrieve data from the encrypted cache
     */
    retrieve(key: string): Promise<string | null>;
    /**
     * Check if a key exists in the cache
     */
    exists(key: string): Promise<boolean>;
    /**
     * Clear the entire cache
     */
    clear(): Promise<void>;
    /**
     * Ensure the cache directory exists
     */
    private ensureCacheDirectory;
    /**
     * Create a hash of a string for filename
     */
    private hashString;
    /**
     * Encrypt data using the current encryption key
     */
    private encrypt;
    /**
     * Decrypt data using the current encryption key
     */
    private decrypt;
    /**
     * Ensure we have a valid encryption key
     */
    private ensureEncryptionKey;
    /**
     * Create a fallback key based on local machine info
     * This is used only if we can't get a key from the server
     */
    private createFallbackKey;
}