@wordpress/editor/src/components/template-actions-panel/index.js

Enhanced block editor for WordPress posts.

import { usePostTemplatePanelMode } from '../post-template/hooks';
import BlockThemeContent from './block-theme-content';
import ClassicThemeContent from './classic-theme-content';

export default function TemplateActionsPanel() {
	const mode = usePostTemplatePanelMode();
	if ( mode === 'classic' ) {
		return <ClassicThemeContent />;
	}
	if ( mode === 'block-theme' ) {
		return <BlockThemeContent />;
	}
	return null;
}