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wp-content/plugins/jetpack-boost/compatibility/jetpack.php

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+<?php
+/**
+ * Jetpack compatibility for Boost
+ *
+ * @package automattic/jetpack-boost
+ */
+
+namespace Automattic\Jetpack_Boost\Compatibility\Jetpack;
+
+require_once __DIR__ . '/lib/class-sync-jetpack-module-status.php';
+
+( new Sync_Jetpack_Module_Status( 'image_cdn', 'photon' ) )->init();
+
+/**
+ * Exclude Jetpack likes scripts from deferred JS. They are already in the footer,
+ * and are sensitive to having their order changed relative to their companion iframe.
+ *
+ * @param array $exclusions The default array of scripts to exclude from deferral.
+ */
+function exclude_jetpack_likes_scripts_defer( $exclusions ) {
+	static $likes_enabled = null;
+
+	if ( null === $likes_enabled ) {
+		$likes_enabled = \Jetpack::is_module_active( 'likes' );
+	}
+
+	if ( $likes_enabled ) {
+		return array_merge(
+			$exclusions,
+			array(
+				'jquery-core',
+				'postmessage',
+				'jetpack_likes_queuehandler',
+			)
+		);
+	}
+
+	return $exclusions;
+}
+
+add_filter( 'jetpack_boost_render_blocking_js_exclude_handles', __NAMESPACE__ . '\exclude_jetpack_likes_scripts_defer', 10, 1 );