react-use/src/useMeasure.ts

import { useCallback, useState } from 'react';
import ResizeObserver from 'resize-observer-polyfill';
export interface ContentRect {
  width: number;
  height: number;
  top: number;
  right: number;
  left: number;
  bottom: number;
}
const useMeasure = <T>(): [(instance: T) => void, ContentRect] => {
  const [rect, set] = useState({
    width: 0,
    height: 0,
    top: 0,
    left: 0,
    bottom: 0,
    right: 0,
  });

  const [observer] = useState(
    () =>
      new ResizeObserver(entries => {
        const entry = entries[0];
        if (entry) {
          set(entry.contentRect);
        }
      })
  );

  const ref = useCallback(
    node => {
      observer.disconnect();
      if (node) {
        observer.observe(node);
      }
    },
    [observer]
  );
  return [ref, rect];
};

export default useMeasure;