/**
 * RequestPreprocessor
 *
 * Pipeline stage that preprocesses requests before execution.
 * Handles variable replacement in URL, headers, and body.
 */
import { HttpRequest } from '../types';
import { IPipelineStage, PipelineContext } from './IPipelineStage';
export declare class RequestPreprocessor implements IPipelineStage {
    readonly name = "request-preprocessor";
    processRequest(request: HttpRequest, context: PipelineContext): Promise<HttpRequest>;
}