/**
 * VibePing SDK — Web Vitals tracking
 * Uses the web-vitals library if available, falls back to PerformanceObserver.
 * Tracks: LCP, CLS, TTFB, INP (FID supported for back-compat, deprecated).
 */
import type { ResolvedConfig, Transport } from './types';
export interface VitalsTracker {
    start(): void;
    stop(): void;
}
/** Create a web vitals tracker */
export declare function createVitalsTracker(config: ResolvedConfig, transport: Transport): VitalsTracker;