ahooks-v2/es/usePrevious/index.js

react hooks library

import { useRef } from 'react';

function usePrevious(state, compare) {
  var prevRef = useRef();
  var curRef = useRef();
  var needUpdate = typeof compare === 'function' ? compare(curRef.current, state) : true;

  if (needUpdate) {
    prevRef.current = curRef.current;
    curRef.current = state;
  }

  return prevRef.current;
}

export default usePrevious;