ant-design/components/menu/demo/submenu-theme.tsx

import React, { useState } from 'react';
import { MailOutlined } from '@ant-design/icons';
import type { MenuProps, MenuTheme } from 'antd';
import { Menu, Switch } from 'antd';

type MenuItem = Required<MenuProps>['items'][number];

function getItem(
  label: React.ReactNode,
  key?: React.Key | null,
  icon?: React.ReactNode,
  children?: MenuItem[],
  theme?: 'light' | 'dark',
): MenuItem {
  return {
    key,
    icon,
    children,
    label,
    theme,
  } as MenuItem;
}

const App: React.FC = () => {
  const [theme, setTheme] = useState<MenuTheme>('light');
  const [current, setCurrent] = useState('1');

  const changeTheme = (value: boolean) => {
    setTheme(value ? 'dark' : 'light');
  };

  const onClick: MenuProps['onClick'] = (e) => {
    setCurrent(e.key);
  };

  const items: MenuItem[] = [
    getItem(
      'Navigation One',
      'sub1',
      <MailOutlined />,
      [getItem('Option 1', '1'), getItem('Option 2', '2'), getItem('Option 3', '3')],
      theme,
    ),
    getItem('Option 5', '5'),
    getItem('Option 6', '6'),
  ];

  return (
    <>
      <Switch
        checked={theme === 'dark'}
        onChange={changeTheme}
        checkedChildren="Dark"
        unCheckedChildren="Light"
      />
      <br />
      <br />
      <Menu
        onClick={onClick}
        style={{ width: 256 }}
        openKeys={['sub1']}
        selectedKeys={[current]}
        mode="vertical"
        theme="dark"
        items={items}
      />
    </>
  );
};

export default App;