import { Pool } from 'pg';
import type { JobNotification, NotificationChannelConfig, JobStateNotification } from 'agenda';
import { BaseNotificationChannel } from 'agenda';
/**
 * Configuration for PostgresNotificationChannel
 */
export interface PostgresNotificationChannelConfig extends NotificationChannelConfig {
    /** PostgreSQL connection pool (shared with repository) */
    pool?: Pool;
    /** PostgreSQL connection string (if not sharing pool) */
    connectionString?: string;
}
/**
 * PostgreSQL notification channel using LISTEN/NOTIFY
 *
 * This implementation uses PostgreSQL's built-in pub/sub mechanism
 * for real-time job notifications across multiple processes.
 */
export declare class PostgresNotificationChannel extends BaseNotificationChannel {
    private pool?;
    private ownPool;
    private connectionString?;
    private listenClient?;
    /** State channel name (derived from main channel name) */
    private get stateChannelName();
    constructor(config?: PostgresNotificationChannelConfig);
    /**
     * Set the pool (used when created by PostgresBackend)
     */
    setPool(pool: Pool): void;
    connect(): Promise<void>;
    private handleConnectionLoss;
    disconnect(): Promise<void>;
    publish(notification: JobNotification): Promise<void>;
    publishState(notification: JobStateNotification): Promise<void>;
    /**
     * Serialize notification to JSON string for NOTIFY payload
     */
    private serializeNotification;
    /**
     * Serialize state notification to JSON string for NOTIFY payload
     */
    private serializeStateNotification;
    /**
     * Parse notification from JSON string received via LISTEN
     */
    private parseNotification;
    /**
     * Parse state notification from JSON string received via LISTEN
     */
    private parseStateNotification;
}