preact-arco-design/es/_util/hooks/useResizeObserver.js

Arco Design React UI Library.

import { useRef } from "preact/compat";
import ResizeObserver from 'resize-observer-polyfill';
export default function useResizeObserver(onResize) {
  var resizeObserver = useRef();

  var destroyObserver = function destroyObserver() {
    if (resizeObserver.current) {
      resizeObserver.current.disconnect();
      resizeObserver.current = null;
    }
  };

  var createObserver = function createObserver(elem) {
    if (elem) {
      if (resizeObserver.current) {
        destroyObserver();
      }

      resizeObserver.current = new ResizeObserver(onResize);
      resizeObserver.current.observe(elem);
    }
  };

  return {
    currentOr: resizeObserver.current,
    cor: createObserver,
    dor: destroyObserver
  };
}