import type { IRequestTiming, IRequestTimingSession } from './IRequestTiming.js';
import type { HttpMethod } from './types.js';
/**
 * Uses undici diagnostics channels to collect best-effort HTTP phase timing.
 */
export declare class RequestTiming implements IRequestTiming {
    /**
     * Starts timing one outbound request attempt.
     *
     * @param requestStart - High-resolution timestamp taken before fetch starts.
     * @param targetUrl - Fully resolved URL for the request attempt.
     * @param method - HTTP method used for the request attempt.
     * @returns Session that can derive phase timings after the request completes.
     */
    start(requestStart: number, targetUrl: string, method: HttpMethod): IRequestTimingSession;
}
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