@fremtind/jkl-react-hooks/build/esm/useMutationObserver/useMutationObserver.js

Jøkul react button components

import { useEffect, useRef } from "react";
const hasWindowWithMutationObserver = () => typeof window !== "undefined" && typeof MutationObserver !== "undefined";
const useMutationObserver = (targetRef, onObservation, config) => {
  const observerRef = useRef(null);
  useEffect(() => {
    let observer = observerRef.current;
    if (hasWindowWithMutationObserver()) {
      const target = targetRef.current;
      if (observer) {
        observer.disconnect();
      }
      observer = new MutationObserver(onObservation);
      if (target) {
        observer.observe(target, config);
      }
    }
    return () => {
      if (hasWindowWithMutationObserver() && observer) {
        observer.disconnect();
      }
    };
  }, [targetRef, onObservation, config]);
};
export {
  useMutationObserver
};
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