import type { CallHandler, ExecutionContext, NestInterceptor } from '@nestjs/common';
import type { Observable } from 'rxjs';
import { ILogger } from '../logging';
import { ProtocolDetector } from '../transport/protocol.detector';
import type { ITransport, PlatformAppPlugin } from '../types';
import type { TracingHeaderMappings } from './types';
/**
 * Extracts headers that should be passed to all logging messages
 * and external calls
 */
export declare class TracingInterceptor implements NestInterceptor {
    private logger;
    private transports;
    private plugins;
    private mappings;
    private detector;
    /**
     * Extractors can be either transports or additional strategies
     * supplied by plugins
     */
    private readonly extractors;
    constructor(logger: ILogger, transports: Set<ITransport>, plugins: Set<PlatformAppPlugin>, mappings: TracingHeaderMappings[], detector: ProtocolDetector);
    intercept(ctx: ExecutionContext, next: CallHandler): Observable<any>;
}