hooks useOnScreen.ts

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  import { RefObject, useEffect, useState } from "react";
 
export function useOnScreen(
  ref: RefObject<HTMLElement | null>,
  rootMargin?: string
): boolean {
  const [isIntersecting, setIsIntersecting] = useState(false);
 
  useEffect(() => {
    Iif (!ref?.current) return;
    const observer = new IntersectionObserver(
      ([entry]) => setIsIntersecting(entry.isIntersecting),
      { rootMargin }
    );
    observer.observe(ref.current);
    return () => {
      observer.disconnect();
    };
  }, [ref, rootMargin]);
 
  return isIntersecting;
}