@plone/volto/src/helpers/Utils/usePrevious.js

Volto

import React from 'react';

/**
 * Hook used to "cache" the "previous" value of a prop or a computed variable.
 */
export function usePrevious(value) {
  const ref = React.useRef();
  React.useEffect(() => {
    ref.current = value;
  }, [value]);
  return ref.current;
}