import { DiscoveryService, MetadataScanner, Reflector } from '@nestjs/core';
import type { BullpenQueueOptions, ResolvedBullpenOptions } from '../interfaces/bullpen-options.interface';
import type { QueueTopology } from '../interfaces/dto.interface';
export declare class QueueTopologyService {
    private readonly discovery;
    private readonly scanner;
    private readonly reflector;
    private readonly options;
    private readonly topologies;
    private built;
    constructor(discovery: DiscoveryService, scanner: MetadataScanner, reflector: Reflector, options: ResolvedBullpenOptions);
    getTopology(queueName: string): QueueTopology;
    /** Per-queue presentation, merging `@BullpenQueue()` metadata over the `queues` option map. */
    getMeta(queueName: string): BullpenQueueOptions;
    private ensureBuilt;
    private collectEvents;
    private empty;
}