ant-design/components/dropdown/demo/menu-full.tsx

import React from 'react';
import { AppstoreOutlined, DownOutlined, MailOutlined, SettingOutlined } from '@ant-design/icons';
import type { MenuProps } from 'antd';
import { Dropdown, Space } from 'antd';

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

function getItem(
  label: React.ReactNode,
  key: React.Key,
  icon?: React.ReactNode,
  children?: MenuItem[],
  type?: 'group',
): MenuItem {
  return {
    key,
    icon,
    children,
    label,
    type,
  } as MenuItem;
}

const items: MenuItem[] = [
  getItem(
    'Item Group',
    'group',
    null,
    [getItem('Option 0', '01'), getItem('Option 0', '02')],
    'group',
  ),
  getItem('Navigation One', 'sub1', <MailOutlined />, [
    getItem('Item 1', 'g1', null, [getItem('Option 1', '1'), getItem('Option 2', '2')], 'group'),
    getItem('Item 2', 'g2', null, [getItem('Option 3', '3'), getItem('Option 4', '4')], 'group'),
  ]),
  getItem('Navigation Two', 'sub2', <AppstoreOutlined />, [
    getItem('Option 5', '5'),
    getItem('Option 6', '6'),
    getItem('Submenu', 'sub3', null, [getItem('Option 7', '7'), getItem('Option 8', '8')]),
  ]),
  getItem('Navigation Three', 'sub4', <SettingOutlined />, [
    getItem('Option 9', '9'),
    getItem('Option 10', '10'),
    getItem('Option 11', '11'),
    getItem('Option 12', '12'),
  ]),
  // Not crash
  null as any,
];

const App: React.FC = () => (
  <Dropdown
    menu={{
      items,
      selectedKeys: ['1'],
      openKeys: ['sub1'],
    }}
  >
    <a onClick={(e) => e.preventDefault()}>
      <Space>
        Hover to check menu style
        <DownOutlined />
      </Space>
    </a>
  </Dropdown>
);

export default App;