@atlaskit/side-navigation/dist/es2019/common/use-child-ids-effect.js

A highly composable side navigation component that supports nested views.

import { useEffect } from 'react';
const useChildIdsEffect = (childIds, id) => {
  useEffect(() => {
    if (!childIds || !childIds.current) {
      return;
    }
    if (!childIds.current.has(id)) {
      childIds.current.add(id);
    }
    return () => {
      // eslint-disable-next-line react-hooks/exhaustive-deps
      childIds.current.delete(id);
    };
    // childIds shouldn't change as it's a ref
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [id]);
};
export default useChildIdsEffect;