@redocly/theme/src/core/hooks/use-unmount.ts

Shared UI components lib

import { useEffect } from 'react';

export const useUnmount = (callback: () => void): void => {
  useEffect(() => {
    return () => {
      callback();
    };
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, []);
};