/**
 * Custom hook for throttling function calls with trailing execution
 *
 * @param fn - The function to throttle
 * @param delay - The throttle delay in milliseconds
 * @returns A throttled version of the function
 *
 * Features:
 * - Throttles function calls to at most once per delay period
 * - Ensures trailing execution: if calls happen during throttle window,
 *   the last call executes at the end of the window
 * - Proper cleanup on component unmount
 * - Handles rapid successive calls by using the latest arguments
 *
 * @example
 * ```tsx
 * const sendReaction = useCallback(async (emoji: string) => {
 *   await send({ type: emoji });
 * }, [send]);
 *
 * const throttledSend = useThrottle(sendReaction, 200);
 *
 * // Usage
 * throttledSend('👍'); // Will execute at end of 200ms window
 * throttledSend('❤️'); // Will override previous call
 * throttledSend('😂'); // Will execute with '😂' after 200ms
 * ```
 */
export declare function useThrottle<Args extends unknown[], R>(fn: (...args: Args) => R, delay: number): (...args: Args) => R;