ant-design/components/cascader/demo/render-panel.tsx

import React from 'react';
import { Cascader } from 'antd';

const { _InternalPanelDoNotUseOrYouWillBeFired: InternalCascader } = Cascader;

interface Option {
  value: string | number;
  label: string;
  children?: Option[];
}

const options: Option[] = [
  {
    value: 'zhejiang',
    label: 'Zhejiang',
    children: [
      {
        value: 'hangzhou',
        label: 'Hangzhou',
        children: [
          {
            value: 'xihu',
            label: 'West Lake',
          },
        ],
      },
    ],
  },
  {
    value: 'jiangsu',
    label: 'Jiangsu',
    children: [
      {
        value: 'nanjing',
        label: 'Nanjing',
        children: [
          {
            value: 'zhonghuamen',
            label: 'Zhong Hua Men',
          },
        ],
      },
    ],
  },
];

const App: React.FC = () => <InternalCascader options={options} placeholder="Please select" />;

export default App;