/**
 * Utility functions for the hydration scheduler.
 */
/**
 * Checks if requestIdleCallback is available.
 */
export declare function hasIdleCallback(): boolean;
/**
 * Safe requestIdleCallback with fallback.
 */
export declare function requestIdle(callback: (deadline: IdleDeadline) => void, options?: IdleRequestOptions): number;
/**
 * Safe cancelIdleCallback with fallback.
 */
export declare function cancelIdle(handle: number): void;
/**
 * Yields to the main thread.
 */
export declare function yieldToMain(): Promise<void>;
/**
 * Calculates percentile from sorted array.
 */
export declare function percentile(sortedValues: number[], p: number): number;