/**
 * Performance Monitoring features for tracking Core Web Vitals and custom metrics
 * Dynamically imported to reduce core bundle size
 */
import { ConversionIQConfig } from '../types/index';
interface PerformanceMetrics {
    lcp?: number;
    fid?: number;
    cls?: number;
    fcp?: number;
    ttfb?: number;
    domContentLoaded?: number;
    loadComplete?: number;
    domInteractive?: number;
    resourceCount?: number;
    totalResourceSize?: number;
    dnsLookup?: number;
    tcpConnect?: number;
    customMarks?: Record<string, number>;
    customMeasures?: Record<string, number>;
}
export declare class PerformanceMonitoring {
    private config;
    private sdk;
    private metrics;
    private isActive;
    private observers;
    constructor(config: ConversionIQConfig, sdk: any);
    /**
     * Start performance monitoring
     */
    start(): void;
    /**
     * Stop performance monitoring
     */
    stop(): void;
    /**
     * Collect initial performance metrics
     */
    private collectInitialMetrics;
    /**
     * Setup Core Web Vitals observers
     */
    private setupCoreWebVitalsObservers;
    /**
     * Setup resource timing observer
     */
    private setupResourceTimingObserver;
    /**
     * Setup navigation timing observer
     */
    private setupNavigationTimingObserver;
    /**
     * Setup user timing observer
     */
    private setupUserTimingObserver;
    /**
     * Generic metric observer setup
     */
    private observeMetric;
    /**
     * Schedule periodic metrics collection
     */
    private scheduleMetricsCollection;
    /**
     * Send performance data to API
     */
    private sendPerformanceData;
    /**
     * Check performance thresholds and send alerts
     */
    private checkPerformanceThresholds;
    /**
     * Add custom performance mark
     */
    mark(name: string): void;
    /**
     * Add custom performance measure
     */
    measure(name: string, startMark?: string, endMark?: string): void;
    /**
     * Get current performance metrics
     */
    getMetrics(): PerformanceMetrics;
    /**
     * Get Core Web Vitals score
     */
    getCoreWebVitalsScore(): {
        lcp: 'good' | 'needs-improvement' | 'poor' | 'unknown';
        fid: 'good' | 'needs-improvement' | 'poor' | 'unknown';
        cls: 'good' | 'needs-improvement' | 'poor' | 'unknown';
        overall: 'good' | 'needs-improvement' | 'poor';
    };
    /**
     * Get resource type from URL
     */
    private getResourceType;
    /**
     * Get connection information
     */
    private getConnectionInfo;
    /**
     * Check if Performance API is available
     */
    private isPerformanceAPIAvailable;
    /**
     * Clear all performance data
     */
    clearData(): void;
}
export {};
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