/**
 * Binary search to find the item at a given scroll offset
 */
export declare function binarySearch(offsets: number[], target: number, low?: number, high?: number): number;
/**
 * Calculate range with overscan
 */
export declare function getOverscanRange(startIndex: number, endIndex: number, overscan: number, itemCount: number): {
    start: number;
    end: number;
};
/**
 * Debounce function
 */
export declare function debounce<T extends (...args: any[]) => any>(fn: T, delay: number): (...args: Parameters<T>) => void;
/**
 * Throttle function
 */
export declare function throttle<T extends (...args: any[]) => any>(fn: T, delay: number): (...args: Parameters<T>) => void;
/**
 * Request animation frame wrapper
 */
export declare function requestAnimationFrameWithFallback(callback: FrameRequestCallback): number;
/**
 * Cancel animation frame with fallback
 */
export declare function cancelAnimationFrameWithFallback(id: number): void;
/**
 * Check if an element is visible in viewport
 */
export declare function isElementInViewport(element: HTMLElement, container: HTMLElement): boolean;
/**
 * Get scroll velocity
 */
export declare function calculateScrollVelocity(currentOffset: number, previousOffset: number, deltaTime: number): number;
/**
 * Clamp a value between min and max
 */
export declare function clamp(value: number, min: number, max: number): number;
/**
 * Check if ResizeObserver is supported
 */
export declare function isResizeObserverSupported(): boolean;
/**
 * Check if IntersectionObserver is supported
 */
export declare function isIntersectionObserverSupported(): boolean;
/**
 * Smooth scroll to position
 */
export declare function smoothScroll(element: HTMLElement, targetScroll: number, duration?: number): Promise<void>;
/**
 * Create a unique key from index and item
 */
export declare function createItemKey<T>(index: number, item: T, keyGetter?: (index: number, item: T) => string | number): string | number;
/**
 * Log virtualization stats (for debugging)
 */
export declare function logVirtualizationStats(stats: {
    itemCount: number;
    visibleCount: number;
    renderedCount: number;
    scrollOffset: number;
    totalSize: number;
}): void;
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