/**
 * Router Metrics Utilities
 *
 * Performance metrics collection and reporting for RSC Router.
 */
import type { MetricsStore } from "../server/context";
/**
 * Create a metrics store for the request if debugPerformance is enabled
 */
export declare function createMetricsStore(debugPerformance: boolean): MetricsStore | undefined;
/**
 * Log metrics to console in a formatted way
 */
export declare function logMetrics(method: string, pathname: string, metricsStore: MetricsStore): void;
/**
 * Generate Server-Timing header value from metrics
 * Format: metric-name;dur=X.XX
 */
export declare function generateServerTiming(metricsStore: MetricsStore): string;
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