/**
 * Async Response Proxy
 *
 * Wraps Express response object to track async response methods like:
 * - res.render()
 * - res.download()
 * - res.sendFile()
 *
 * This allows express-numflow to wait for these async methods to complete
 * before checking if response was sent.
 */
import { ServerResponse } from 'http';
/**
 * Tracker for async response operations
 */
export interface AsyncResponseTracker {
    pending: boolean;
    promise: Promise<void> | null;
}
/**
 * Create a Proxy wrapper for Express response object
 *
 * Intercepts async response methods and tracks their completion
 *
 * @param res - Express response object
 * @param tracker - Tracker object to store async operation state
 * @returns Proxied response object
 */
export declare function createAsyncResponseProxy(res: ServerResponse, tracker: AsyncResponseTracker): ServerResponse;
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