import type { EventEmitter } from 'events';
import type { TTLData } from './types.js';
/**
 * TTL (Time To Live) Manager
 * Handles expiration logic for database keys with automatic cleanup
 */
export declare class TTLManager {
    /** Map storing key -> expiration timestamp mappings */
    private ttlData;
    /** Event emitter for TTL-related events */
    private eventEmitter;
    /** Interval timer for periodic cleanup */
    private cleanupInterval;
    /** Cleanup interval in milliseconds */
    private cleanupIntervalMs;
    /**
     * Creates a new TTL manager instance
     * @param eventEmitter - Optional event emitter for TTL events
     * @param cleanupIntervalMs - Cleanup interval in milliseconds (default: 60000)
     */
    constructor(eventEmitter?: EventEmitter, cleanupIntervalMs?: number);
    /**
     * Set TTL for a key
     * @param key - The key to set TTL for
     * @param ttlSeconds - TTL duration in seconds
     */
    setTTL(key: string, ttlSeconds: number): void;
    /**
     * Get remaining TTL for a key in seconds
     * @param key - The key to check TTL for
     * @returns Remaining TTL in seconds, or null if no TTL set or expired
     */
    getTTL(key: string): number | null;
    /**
     * Clear TTL for a key
     * @param key - The key to clear TTL for
     * @returns True if TTL was cleared, false if no TTL was set
     */
    clearTTL(key: string): boolean;
    /**
     * Check if a key has expired
     * @param key - The key to check
     * @returns True if the key has expired, false otherwise
     */
    isExpired(key: string): boolean;
    /**
     * Get all expired keys
     * @returns Array of keys that have expired
     */
    getExpiredKeys(): string[];
    /**
     * Remove expired keys from TTL tracking
     * @param expiredKeys - Array of expired keys to remove
     */
    removeExpiredKeys(expiredKeys: string[]): void;
    /**
     * Get all TTL data for serialization
     * @returns TTL data object with non-expired keys only
     */
    getAllTTLData(): TTLData;
    /**
     * Load TTL data from deserialization
     * @param ttlData - TTL data to load
     */
    loadTTLData(ttlData: TTLData): void;
    /**
     * Start periodic cleanup of expired keys
     * Runs cleanup at the configured interval
     */
    private startCleanup;
    /**
     * Stop periodic cleanup
     */
    stopCleanup(): void;
    /**
     * Clear all TTL data
     */
    clear(): void;
    /**
     * Get count of keys with TTL
     * @returns Number of keys currently tracked for TTL
     */
    size(): number;
}
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