ant-design/components/cascader/hooks/useColumnIcons.tsx

import * as React from 'react';
import LeftOutlined from '@ant-design/icons/LeftOutlined';
import LoadingOutlined from '@ant-design/icons/LoadingOutlined';
import RightOutlined from '@ant-design/icons/RightOutlined';

export default function useColumnIcons(
  prefixCls: string,
  rtl: boolean,
  expandIcon?: React.ReactNode,
) {
  let mergedExpandIcon = expandIcon;
  if (!expandIcon) {
    mergedExpandIcon = rtl ? <LeftOutlined /> : <RightOutlined />;
  }

  const loadingIcon = (
    <span className={`${prefixCls}-menu-item-loading-icon`}>
      <LoadingOutlined spin />
    </span>
  );

  return [mergedExpandIcon, loadingIcon];
}