Function normalize

src/TransitionWrapper.tsx:47–51

(callback?: (node: HTMLElement, param: any) => void)

    const normalize =
      (callback?: (node: HTMLElement, param: any) => void) => (param: any) => {
        if (callback && nodeRef.current) {
          callback(nodeRef.current, param);
        }
      };

    const handleEnter = useCallback(normalize(onEnter), [onEnter]);
    const handleEntering = useCallback(normalize(onEntering), [onEntering]);