@wordpress/block-editor/build-module/components/block-list/use-block-props/use-intersection-observer.js

Generic block editor.

/**
 * WordPress dependencies
 */
import { useRefEffect } from '@wordpress/compose';
import { useContext } from '@wordpress/element';

/**
 * Internal dependencies
 */
import { IntersectionObserver } from '../';
export function useIntersectionObserver() {
  const observer = useContext(IntersectionObserver);
  return useRefEffect(node => {
    if (observer) {
      observer.observe(node);
      return () => {
        observer.unobserve(node);
      };
    }
  }, [observer]);
}
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