import { Type } from '@nestjs/common';
import { Reflector } from '@nestjs/core';
import { MiddlewareOptions, UseMiddlewaresMetadata } from '../decorators/middleware.decorators';
import { WorkerEventName } from '../interfaces/worker.interfaces';
/**
 * Heavily inspired from [`BullMetadataAccessor`](https://github.com/nestjs/bull/blob/c230eab1dc26fb743a3428e61043167866b1e377/lib/bull-metadata.accessor.ts)
 */
export declare class MetadataAccessorService {
    private readonly reflector;
    constructor(reflector: Reflector);
    isListener(target: Type | Function): boolean;
    isWorkerEvent(target: Type | Function): boolean;
    getListenerMetadata(target: Type | Function): WorkerEventName | undefined;
    isTask(target: Type | Function): boolean;
    isTaskHandler(target: Type | Function): boolean;
    getTaskMetadata(target: Type | Function): string | undefined;
    getHandlerMiddlewareMetadata(target: Type | Function): UseMiddlewaresMetadata | undefined;
    isMiddleware(target: Type | Function): boolean;
    getMiddlewareMetadata(target: any): MiddlewareOptions | undefined;
    private hasMetadata;
}