export interface WebVitalsMetrics {
    lcp?: number;
    fid?: number;
    cls?: number;
    fcp?: number;
    ttfb?: number;
    inp?: number;
}
export interface UseWebVitalsOptions {
    /** Enable tracking (default: true in dev, false in prod) */
    enabled?: boolean;
    /** Callback when metrics update */
    onUpdate?: (metrics: WebVitalsMetrics) => void;
}
/**
 * Hook to track Core Web Vitals metrics
 *
 * @example
 * ```tsx
 * const { metrics, isSupported } = useWebVitals();
 * console.log('LCP:', metrics.lcp);
 * ```
 */
export declare const useWebVitals: (options?: UseWebVitalsOptions) => {
    metrics: WebVitalsMetrics;
    isSupported: boolean;
};
/**
 * Get rating for a Web Vital metric
 */
export declare const getWebVitalRating: (metric: keyof WebVitalsMetrics, value?: number) => "good" | "needs-improvement" | "poor" | "unknown";
//# sourceMappingURL=useWebVitals.d.ts.map