/// <reference types="node" />
import { EventEmitter } from 'events';
import type { IPushDataType } from '../Interfaces';
import type { Logger } from '../Logger';
import type { User } from '../databases/entities/User';
import type { OrchestrationService } from '../services/orchestration.service';
export declare abstract class AbstractPush<T> extends EventEmitter {
    protected readonly logger: Logger;
    private readonly orchestrationService;
    protected connections: Record<string, T>;
    protected userIdByPushRef: Record<string, string>;
    protected abstract close(connection: T): void;
    protected abstract sendToOneConnection(connection: T, data: string): void;
    constructor(logger: Logger, orchestrationService: OrchestrationService);
    protected add(pushRef: string, userId: User['id'], connection: T): void;
    protected onMessageReceived(pushRef: string, msg: unknown): void;
    protected remove(pushRef?: string): void;
    private sendTo;
    sendToAll(type: IPushDataType, data?: unknown): void;
    sendToOneSession(type: IPushDataType, data: unknown, pushRef: string): void;
    sendToUsers(type: IPushDataType, data: unknown, userIds: Array<User['id']>): void;
    closeAllConnections(): void;
    hasPushRef(pushRef: string): boolean;
}