pento

( function( blocks, element ) {
	var el = element.createElement;

	function Stars( { stars } ) {
		return el( 'div', { key: 'stars' },
			'★'.repeat( stars ),
			( ( stars * 2 ) % 2 ) ? '½' : '' );
	}

	blocks.registerBlockType( 'stars/stars-block', {

pento

<?php
/*
 * Plugin Name: Commercial Client
 * Plugin URI: http://pento.net/
 * Description: A sample client plugin for showing updates for non-WordPress.org plugins
 * Author: pento
 * Version: 0.1
 * Author URI: http://pento.net/
 * License: GPL2+
 */

pento

// License: GPLv2+

var el = wp.element.createElement,
	registerBlockType = wp.blocks.registerBlockType,
	ServerSideRender = wp.components.ServerSideRender,
	TextControl = wp.components.TextControl,
	InspectorControls = wp.editor.InspectorControls;

/*
 * Here's where we register the block in JavaScript.