/**
 * Web Vitals measurement utilities
 * Implements Google's Core Web Vitals metrics
 */
export type MetricName = 'CLS' | 'FCP' | 'FID' | 'LCP' | 'TTFB' | 'INP';
export interface WebVitalMetric {
    name: MetricName;
    value: number;
    rating: 'good' | 'needs-improvement' | 'poor';
}
export type WebVitalReportCallback = (metric: WebVitalMetric) => void;
/**
 * Measure Cumulative Layout Shift (CLS)
 */
export declare function measureCLS(onReport: WebVitalReportCallback): void;
/**
 * Measure First Contentful Paint (FCP)
 */
export declare function measureFCP(onReport: WebVitalReportCallback): void;
/**
 * Measure Largest Contentful Paint (LCP)
 */
export declare function measureLCP(onReport: WebVitalReportCallback): void;
/**
 * Measure First Input Delay (FID)
 */
export declare function measureFID(onReport: WebVitalReportCallback): void;
/**
 * Measure Time to First Byte (TTFB)
 */
export declare function measureTTFB(onReport: WebVitalReportCallback): void;
/**
 * Measure Interaction to Next Paint (INP)
 */
export declare function measureINP(onReport: WebVitalReportCallback): void;
/**
 * Initialize all Web Vitals measurements
 */
export declare function initWebVitals(onReport?: WebVitalReportCallback): void;
/**
 * Report route change performance
 * @param fromRoute - Previous route
 * @param toRoute - New route
 * @param duration - Time taken in milliseconds
 */
export declare function reportRouteChange(fromRoute: string, toRoute: string, duration: number): void;
/**
 * Report custom performance metric
 * @param metricName - Name of the custom metric
 * @param value - Numeric value of the metric
 * @param attributes - Optional attributes to add context
 */
export declare function reportCustomMetric(metricName: string, value: number, attributes?: Record<string, string>): void;
/**
 * Report API call performance
 * @param endpoint - API endpoint
 * @param duration - Time taken in milliseconds
 * @param status - HTTP status code
 * @param method - HTTP method
 */
export declare function reportApiCall(endpoint: string, duration: number, status: number, method?: string): void;
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