@wordpress/server-side-render/src/index.js

The component used with WordPress to server-side render a preview of dynamic blocks to display in the editor.

/**
 * WordPress dependencies
 */
import { useMemo } from '@wordpress/element';
import { useSelect } from '@wordpress/data';

/**
 * Internal dependencies
 */
import ServerSideRender from './server-side-render';

/**
 * Constants
 */
const EMPTY_OBJECT = {};

export default function ExportedServerSideRender( {
	urlQueryArgs = EMPTY_OBJECT,
	...props
} ) {
	const currentPostId = useSelect( ( select ) => {
		// FIXME: @wordpress/server-side-render should not depend on @wordpress/editor.
		// It is used by blocks that can be loaded into a *non-post* block editor.
		// eslint-disable-next-line @wordpress/data-no-store-string-literals
		const postId = select( 'core/editor' )?.getCurrentPostId();

		// For templates and template parts we use a custom ID format.
		// Since they aren't real posts, we don't want to use their ID
		// for server-side rendering. Since they use a string based ID,
		// we can assume real post IDs are numbers.
		return postId && typeof postId === 'number' ? postId : null;
	}, [] );

	const newUrlQueryArgs = useMemo( () => {
		if ( ! currentPostId ) {
			return urlQueryArgs;
		}
		return {
			post_id: currentPostId,
			...urlQueryArgs,
		};
	}, [ currentPostId, urlQueryArgs ] );

	return <ServerSideRender urlQueryArgs={ newUrlQueryArgs } { ...props } />;
}