ant-design/components/config-provider/UnstableContext.tsx

import * as React from 'react';
import * as ReactDOM from 'react-dom';
import { render, unmount } from 'rc-util/lib/React/render';

import warning from '../_util/warning';

export type UnmountType = () => Promise<void>;
export type RenderType = (
  node: React.ReactElement,
  container: Element | DocumentFragment,
) => UnmountType;

const defaultReactRender: RenderType = (node, container) => {
  // TODO: Remove in v6
  // Warning for React 19
  if (process.env.NODE_ENV !== 'production') {
    const majorVersion = parseInt(React.version.split('.')[0], 10);
    warning(
      majorVersion < 19 ||
        !!(
          ReactDOM as typeof ReactDOM & {
            createRoot: VoidFunction;
          }
        ).createRoot,
      'compatible',
      'antd v5 support React is 16 ~ 18. see https://u.ant.design/v5-for-19 for compatible.',
    );
  }

  render(node, container);
  return () => {
    return unmount(container);
  };
};

let unstableRender: RenderType = defaultReactRender;

/**
 * @deprecated Set React render function for compatible usage.
 * This is internal usage only compatible with React 19.
 * And will be removed in next major version.
 */
export function unstableSetRender(render: RenderType) {
  unstableRender = render;
}

export function getReactRender() {
  return unstableRender;
}