/**
 * @sc4rfurryx/proteusjs/perf
 * Performance guardrails and CWV-friendly patterns
 *
 * @version 2.0.0
 * @author sc4rfurry
 * @license MIT
 */
interface SpeculationOptions {
    prerender?: string[];
    prefetch?: string[];
    sameOriginOnly?: boolean;
}
interface ContentVisibilityOptions {
    containIntrinsicSize?: string;
}
/**
 * Apply content-visibility for performance optimization
 */
declare function contentVisibility(selector: string | Element, mode?: 'auto' | 'hidden', opts?: ContentVisibilityOptions): void;
/**
 * Set fetch priority for resources
 */
declare function fetchPriority(selector: string | Element, priority: 'high' | 'low' | 'auto'): void;
/**
 * Set up speculation rules for prerendering and prefetching
 */
declare function speculate(opts: SpeculationOptions): void;
/**
 * Yield to browser using scheduler.yield or postTask when available
 */
declare function yieldToBrowser(): Promise<void>;
/**
 * Optimize images with loading and decoding hints
 */
declare function optimizeImages(selector?: string | Element): void;
/**
 * Preload critical resources
 */
declare function preloadCritical(resources: Array<{
    href: string;
    as: string;
    type?: string;
}>): void;
/**
 * Measure and report Core Web Vitals
 */
declare function measureCWV(): Promise<{
    lcp?: number;
    fid?: number;
    cls?: number;
}>;
declare const boost: {
    contentVisibility: typeof contentVisibility;
    fetchPriority: typeof fetchPriority;
    speculate: typeof speculate;
    yieldToBrowser: typeof yieldToBrowser;
    optimizeImages: typeof optimizeImages;
    preloadCritical: typeof preloadCritical;
    measureCWV: typeof measureCWV;
};
declare const _default: {
    contentVisibility: typeof contentVisibility;
    fetchPriority: typeof fetchPriority;
    speculate: typeof speculate;
    yieldToBrowser: typeof yieldToBrowser;
    optimizeImages: typeof optimizeImages;
    preloadCritical: typeof preloadCritical;
    measureCWV: typeof measureCWV;
    boost: {
        contentVisibility: typeof contentVisibility;
        fetchPriority: typeof fetchPriority;
        speculate: typeof speculate;
        yieldToBrowser: typeof yieldToBrowser;
        optimizeImages: typeof optimizeImages;
        preloadCritical: typeof preloadCritical;
        measureCWV: typeof measureCWV;
    };
};

export { boost, contentVisibility, _default as default, fetchPriority, measureCWV, optimizeImages, preloadCritical, speculate, yieldToBrowser };
export type { ContentVisibilityOptions, SpeculationOptions };