@atlaskit/editor-common/dist/es2019/hooks/usePreviousState.js

A package that contains common classes and components for editor and renderer

import { useRef } from 'react';

/**
 *
 * Can be used to get the previous state of a prop.
 * This can be helpful when converting class components to functional
 * where we don't have the `prevProps`.
 *
 * @param value New state of the
 * @param initialValue Optional parameter for the inital state of the component
 * @returns
 */
export default function usePreviousState(value, initialValue) {
  const ref = useRef(initialValue);
  const prevValue = ref.current;
  ref.current = value;
  return prevValue;
}