useIntersectionObserver

import { useIntersectionObserver } from "@tealess/hooks";

const Section = (props) => {
  const { isIntersecting, ref } = useIntersectionObserver({
    threshold: 0.5,
  });

  console.log(`Render Section ${props.title}`, {
    isIntersecting,
  });

  return (
    <div
      ref={ref}
      style={{
        minHeight: "100vh",
        display: "flex",
        border: "1px dashed #000",
        fontSize: "2rem",
      }}
    >
      <div style={{ margin: "auto" }}>{props.title}</div>
    </div>
  );
};

export default function Component() {
  return (
    <>
      {Array.from({ length: 5 }).map((_, index) => (
        <Section key={index + 1} title={`${index + 1}`} />
      ))}
    </>
  );
}