/**
 * Critical rendering path optimizer for fastest possible page loads
 */
export declare class CriticalPathOptimizer {
    private criticalResources;
    private observedMetrics;
    constructor();
    private defineCriticalResources;
    private startPerformanceObservation;
    private optimizeBasedOnFCP;
    private optimizeBasedOnLCP;
    private optimizeBasedOnTTFB;
    private applyEmergencyOptimizations;
    private applyMediumOptimizations;
    private optimizeLCPElements;
    private enableAggressiveCaching;
    private preloadResource;
    optimizeCriticalPath(): void;
    private inlineCriticalCSS;
    private optimizeFontLoading;
    private removeRenderBlocking;
    private setupProgressiveLoading;
    private isSmallResource;
    getPerformanceMetrics(): {
        score: number;
        fcp: number;
        lcp: number;
        fid: number;
        cls: number;
        ttfb: number;
    };
    private calculatePerformanceScore;
}
export declare function initializeCriticalPathOptimization(): void;
export declare function getPerformanceMetrics(): {
    score: number;
    fcp: number;
    lcp: number;
    fid: number;
    cls: number;
    ttfb: number;
} | undefined;
//# sourceMappingURL=criticalPathOptimizer.d.ts.map