kollapsminoriteten/wp-content/plugins/jetpack/extensions/blocks/sharing-buttons/sharing-buttons.php

<?php
/**
 * Sharing Buttons Block.
 *
 * @since 11.x
 *
 * @package automattic/jetpack
 */

namespace Automattic\Jetpack\Extensions\Sharing_Buttons;

use Automattic\Jetpack\Blocks;
use Automattic\Jetpack\Status\Request;

if ( ! defined( 'ABSPATH' ) ) {
	exit( 0 );
}

/**
 * Registers the block for use in Gutenberg
 * This is done via an action so that we can disable
 * registration if we need to.
 */
function register_block() {
	Blocks::jetpack_register_block(
		__DIR__,
		array( 'render_callback' => __NAMESPACE__ . '\render_block' )
	);
}
add_action( 'init', __NAMESPACE__ . '\register_block' );

/**
 * Sharing Buttons block registration/dependency declaration.
 *
 * @param array  $attr    Array containing the Sharing Buttons block attributes.
 * @param string $content String containing the Sharing Buttons block content.
 *
 * @return string
 */
function render_block( $attr, $content ) {
	// Render nothing in other contexts than frontend (i.e. feed, emails, API, etc.).
	if ( ! Request::is_frontend() ) {
		return '';
	}

	return $content;
}