import type { ArgumentsHost } from '@nestjs/common';
import type { ITransport } from '../types';
/**
 * This class is used to detect current protocol (transport type).
 * Mostly used in global enhancers to decide: "to work of not to work"
 */
export declare class ProtocolDetector {
    private transports;
    constructor(transports: ITransport[]);
    /**
     * Detects transport's protocol by ArgumentHost (context)
     */
    getProtocol(context: ArgumentsHost): string | undefined;
    /**
     * Checks that transport's protocol matches the provided one.
     * (just convenience method)
     */
    matchProtocol(context: ArgumentsHost, protocol: string): boolean;
    private getTransport;
}