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wp-content/plugins/jetpack-boost/app/contracts/interface-has-data-sync.php

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+<?php
+namespace Automattic\Jetpack_Boost\Contracts;
+
+use Automattic\Jetpack\WP_JS_Data_Sync\Data_Sync;
+
+interface Has_Data_Sync {
+	/**
+	 * Registers data sync for a modules that is wrapping a Feature within Features_Index.
+	 *
+	 * @param Data_Sync $instance The data sync instance.
+	 *
+	 * @return void
+	 */
+	public function register_data_sync( Data_Sync $instance );
+}