import type { Model } from './model';
/**
 * TTL (Time To Live) Manager
 * Manages automatic cleanup of expired documents based on TTL indexes
 */
export declare class TTLManager {
    private intervals;
    /**
     * Register a TTL index for automatic cleanup
     * @param model - The model to monitor
     * @param field - The field containing the timestamp
     * @param ttlSeconds - Time to live in seconds
     * @param checkIntervalMs - How often to check for expired documents (default: 60 seconds)
     */
    registerTTLIndex<T extends object = Record<string, unknown>>(model: Model<T>, field: string, ttlSeconds: number, checkIntervalMs?: number): void;
    /**
     * Clean up expired documents for a specific field
     */
    private cleanupExpiredDocuments;
    /**
     * Unregister a TTL index (stop automatic cleanup)
     */
    unregisterTTLIndex(key: string): void;
    /**
     * Clean up all TTL intervals (call on disconnect)
     */
    cleanup(): void;
    /**
     * Get the number of active TTL indexes
     */
    getActiveCount(): number;
}
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