astro/packages/integrations/react/client.js

import { createElement } from 'react';
import { createRoot, hydrateRoot } from 'react-dom/client';
import StaticHtml from './static-html.js';

export default (element) => (Component, props, children, { client }) =>
	{
		const componentEl = createElement(
			Component,
			props,
			children != null
				? createElement(StaticHtml, { value: children })
				: children
		);
		if (client === 'only') {
			return createRoot(element).render(componentEl);
		}
		return hydrateRoot(element, componentEl);
	};