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wp-content/plugins/jetpack/extensions/blocks/slideshow/slideshow.php

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+<?php
+/**
+ * Slideshow Block.
+ *
+ * @since 7.1.0
+ *
+ * @package automattic/jetpack
+ */
+
+namespace Automattic\Jetpack\Extensions\Slideshow;
+
+use Automattic\Jetpack\Blocks;
+
+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__ . '\load_assets',
+			'render_email_callback' => __NAMESPACE__ . '\render_email',
+		)
+	);
+}
+add_action( 'init', __NAMESPACE__ . '\register_block' );
+
+/**
+ * Slideshow block registration/dependency declaration.
+ *
+ * The heavy render implementation lives in render.php and is only loaded when
+ * the block is actually rendered, keeping it out of the eager front-end path.
+ *
+ * @param array  $attr    Array containing the slideshow block attributes.
+ * @param string $content String containing the slideshow block content.
+ *
+ * @return string
+ */
+function load_assets( $attr, $content ) {
+	require_once __DIR__ . '/render.php';
+	return render( $attr, $content );
+}
+
+/**
+ * Render slideshow block for email.
+ *
+ * @since 15.0
+ *
+ * @param string $block_content     The original block HTML content.
+ * @param array  $parsed_block      The parsed block data including attributes.
+ * @param object $rendering_context Email rendering context.
+ *
+ * @return string
+ */
+function render_email( $block_content, array $parsed_block, $rendering_context ) {
+	require_once __DIR__ . '/render.php';
+	return render_email_implementation( $block_content, $parsed_block, $rendering_context );
+}