export declare function getPerformanceScore(url: string, device?: "desktop" | "mobile"): Promise<{
    url: string;
    device: string;
    performanceScore: number;
    metrics: Record<string, {
        title: string;
        value: number;
        displayValue: string;
        score: number | null;
    }>;
    fetchTime: string;
}>;
export declare function getCoreWebVitals(url: string, device?: "desktop" | "mobile", threshold?: {
    lcp?: number;
    fid?: number;
    cls?: number;
}): Promise<{
    url: string;
    device: string;
    coreWebVitals: {
        lcp: {
            title: string;
            value: number;
            displayValue: string;
            score: number | null;
        };
        fcp: {
            title: string;
            value: number;
            displayValue: string;
            score: number | null;
        };
        cls: {
            title: string;
            value: number;
            displayValue: string;
            score: number | null;
        };
        tbt: {
            title: string;
            value: number;
            displayValue: string;
            score: number | null;
        };
    };
    thresholdResults: {
        lcp: boolean | null;
        fid: boolean | null;
        cls: boolean | null;
    } | null;
    fetchTime: string;
}>;
export declare function compareMobileDesktop(url: string, categories?: string[], throttling?: boolean): Promise<{
    url: string;
    mobile: {
        categories: Record<string, {
            title: string;
            score: number;
            description: string;
        }>;
        metrics: Record<string, {
            title: string;
            value: number;
            displayValue: string;
            score: number | null;
        }>;
    };
    desktop: {
        categories: Record<string, {
            title: string;
            score: number;
            description: string;
        }>;
        metrics: Record<string, {
            title: string;
            value: number;
            displayValue: string;
            score: number | null;
        }>;
    };
    differences: Record<string, {
        mobile: number;
        desktop: number;
        difference: number;
    }>;
}>;
export declare function checkPerformanceBudget(url: string, device: "desktop" | "mobile" | undefined, budget: {
    performanceScore?: number;
    firstContentfulPaint?: number;
    largestContentfulPaint?: number;
    totalBlockingTime?: number;
    cumulativeLayoutShift?: number;
    speedIndex?: number;
}): Promise<{
    url: string;
    device: string;
    fetchTime: string;
    results: Record<string, {
        actual: number;
        budget: number;
        passed: boolean;
        unit: string;
    }>;
    overallPassed: boolean;
}>;
export declare function getLcpOpportunities(url: string, device?: "desktop" | "mobile", threshold?: number): Promise<{
    url: string;
    device: "desktop" | "mobile";
    lcpValue: number;
    threshold: number;
    needsImprovement: boolean;
    opportunities: ({
        id: "render-blocking-resources" | "unused-css-rules" | "unused-javascript" | "modern-image-formats" | "uses-optimized-images" | "efficient-animated-content" | "preload-lcp-image" | "uses-text-compression";
        title: string;
        description: string | undefined;
        score: number;
        displayValue: string | undefined;
        numericValue: number | undefined;
    } | null)[];
    fetchTime: string;
}>;