tools_auto_web/node_modules/antd/es/config-provider/hooks/useCSSVarCls.js

import { useToken } from '../../theme/internal';
/**
 * This hook is only for cssVar to add root className for components.
 * If root ClassName is needed, this hook could be refactored with `-root`
 * @param prefixCls
 */
const useCSSVarCls = prefixCls => {
  const [,,,, cssVar] = useToken();
  return cssVar ? `${prefixCls}-css-var` : '';
};
export default useCSSVarCls;