import type { Logger, TopicsInput } from '../types/index.js';
export declare class SubscriptionManager {
    private readonly logger;
    private subscriptions;
    constructor(logger?: Logger | null);
    subscribe(topic: string): void;
    unsubscribe(topic: string): void;
    isSubscribed(topic: string): boolean;
    subscribeMany({ topics }: TopicsInput): void;
    unsubscribeMany({ topics }: TopicsInput): void;
    clear(): void;
    getAll(): string[];
    size(): number;
}