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wp-content/plugins/jetpack/extensions/blocks/image-compare/image-compare.php

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+<?php
+/**
+ * Image Compare Block.
+ *
+ * @since 8.6
+ *
+ * @package automattic/jetpack
+ */
+
+namespace Automattic\Jetpack\Extensions\ImageCompare;
+
+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' )
+	);
+}
+add_action( 'init', __NAMESPACE__ . '\register_block' );
+
+/**
+ * Image Compare block registration/dependency declaration.
+ *
+ * The 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 image-compare block attributes.
+ * @param string $content String containing the image-compare block content.
+ *
+ * @return string
+ */
+function load_assets( $attr, $content ) {
+	require_once __DIR__ . '/render.php';
+	return render_implementation( $attr, $content );
+}