grafana/public/app/plugins/panel/nodeGraph/useHighlight.ts

import { useEffect, useState } from 'react';
import useMountedState from 'react-use/lib/useMountedState';

export function useHighlight(focusedNodeId?: string) {
  const [highlightId, setHighlightId] = useState<string>();
  const mounted = useMountedState();
  useEffect(() => {
    if (focusedNodeId) {
      setHighlightId(focusedNodeId);
      setTimeout(() => {
        if (mounted()) {
          setHighlightId(undefined);
        }
      }, 500);
    }
  }, [focusedNodeId, mounted]);

  return highlightId;
}