sient ] ) && $checksums[ $transient ] === $new_checksum ) {
			return;
		}

		$checksums[ $transient ] = $new_checksum;

		update_option( self::UPDATES_CHECKSUM_OPTION_NAME, $checksums );
		if ( 'update_core' === $transient ) {
			/**
			 * Trigger a change to core update that we want to sync.
			 *
			 * @since 5.1.0
			 *
			 * @param array $value Contains info that tells us what needs updating.
			 */
			do_action( 'jetpack_update_core_change', $value );
			return;
		}
		if ( empty( $this->updates ) ) {
			// Lets add the shutdown method once and only when the updates move from empty to filled with something.
			add_action( 'shutdown', array( $this, 'sync_last_event' ), 9 );
		}
		if ( ! isset( $this->updates[ $transient ] ) ) {
			$this->updates[ $transient ] = array();
		}
		$this->updates[ $transient ][] = $value;
	}

	/**
	 * Sync the last update only.
	 *
	 * @access public
	 */
	public function sync_last_event() {
		foreach ( $this->updates as $transient => $values ) {
			$value = end( $values ); // Only send over the last value.
			/**
			 * Trigger a change to a specific update that we want to sync.
			 * Triggers one of the following actions:
			 * - jetpack_{$transient}_change
			 * - jetpack_update_plugins_change
			 * - jetpack_update_themes_change
			 *
			 * @since 5.1.0
			 *
			 * @param array $value Contains info that tells us what needs updating.
			 */
			do_action( "jetpack_{$transient}_change", $value );
		}

	}

	/**
	 * Enqueue the updates actions for full sync.
	 *
	 * @access public
	 *
	 * @param array   $config               Full sync configuration for this sync module.
	 * @param int     $max_items_to_enqueue Maximum number of items to enqueue.
	 * @param boolean $state                True if full sync has finished enqueueing this module, false otherwise.
	 * @return array Number of actions enqueued, and next module state.
	 */
	public function enqueue_full_sync_actions( $config, $max_items_to_enqueue, $state ) { // phpcs:ignore VariableAnalysis.CodeAnalysis.VariableAnalysis.UnusedVariable
		/**
		 * Tells the client to sync all updates to the server
		 *
		 * @since 4.2.0
		 *
		 * @param boolean Whether to expand updates (should always be true)
		 */
		do_action( 'jetpack_full_sync_updates', true );

		// The number of actions enqueued, and next module state (true == done).
		return array( 1, true );
	}

	/**
	 * Send the updates actions for full sync.
	 *
	 * @access public
	 *
	 * @param array $config Full sync configuration for this sync module.
	 * @param int   $send_until The timestamp until the current request can send.
	 * @param array $state This module Full Sync status.
	 *
	 * @return array This module Full Sync status.
	 */
	public function send_full_sync_actions( $config, $send_until, $state ) { // phpcs:ignore VariableAnalysis.CodeAnalysis.VariableAnalysis.UnusedVariable
		// we call this instead of do_action when sending immediately.
		$this->send_action( 'jetpack_full_sync_updates', array( true ) );

		// The number of actions enqueued, and next module state (true == done).
		return array( 'finished' => true );
	}

	/**
	 * Retrieve an estimated number of actions that will be enqueued.
	 *
	 * @access public
	 *
	 * @param array $config Full sync configuration for this sync module.
	 * @return array Number of items yet to be enqueued.
	 */
	public function estimate_full_sync_actions( $config ) { // phpcs:ignore VariableAnalysis.CodeAnalysis.VariableAnalysis.UnusedVariable
		return 1;
	}

	/**
	 * Retrieve the actions that will be sent for this module during a full sync.
	 *
	 * @access public
	 *
	 * @return array Full sync actions of this module.
	 */
	public function get_full_sync_actions() {
		return array( 'jetpack_full_sync_updates' );
	}

	/**
	 * Retrieve all updates that we're interested in.
	 *
	 * @access public
	 *
	 * @return array All updates.
	 */
	public function get_all_updates() {
		return array(
			'core'    => get_site_transient( 'update_core' ),
			'plugins' => get_site_transient( 'update_plugins' ),
			'themes'  => get_site_transient( 'update_themes' ),
		);
	}

	/**
	 * Remove unnecessary keys from synced updates data.
	 *
	 * @access public
	 *
	 * @param array $args Hook arguments.
	 * @return array $args Hook arguments.
	 */
	public function filter_update_keys( $args ) {
		$updates = $args[0];

		if ( isset( $updates->no_update ) ) {
			unset( $updates->no_update );
		}

		return $args;
	}

	/**
	 * Filter out upgrader object from the completed upgrader action args.
	 *
	 * @access public
	 *
	 * @param array $args Hook arguments.
	 * @return array $args Filtered hook arguments.
	 */
	public function filter_upgrader_process_complete( $args ) {
		array_shift( $args );

		return $args;
	}

	/**
	 * Expand the updates within a hook before they are serialized and sent to the server.
	 *
	 * @access public
	 *
	 * @param array $args The hook parameters.
	 * @return array $args The hook parameters.
	 */
	public function expand_updates( $args ) {
		if ( $args[0] ) {
			return $this->get_all_updates();
		}

		return $args;
	}

	/**
	 * Expand the themes within a hook before they are serialized and sent to the server.
	 *
	 * @access public
	 *
	 * @param array $args The hook parameters.
	 * @return array $args The hook parameters.
	 */
	public function expand_themes( $args ) {
		if ( ! isset( $args[0], $args[0]->response ) ) {
			return $args;
		}
		if ( ! is_array( $args[0]->response ) ) {
			// phpcs:ignore WordPress.PHP.DevelopmentFunctions.error_log_trigger_error
			trigger_error( 'Warning: Not an Array as expected but -> ' . wp_json_encode( $args[0]->response ) . ' instead', E_USER_WARNING );
			return $args;
		}
		foreach ( $args[0]->response as $stylesheet => &$theme_data ) {
			$theme              = wp_get_theme( $stylesheet );
			$theme_data['name'] = $theme->name;
		}
		return $args;
	}

	/**
	 * Perform module cleanup.
	 * Deletes any transients and options that this module uses.
	 * Usually triggered when uninstalling the plugin.
	 *
	 * @access public
	 */
	public function reset_data() {
		delete_option( self::UPDATES_CHECKSUM_OPTION_NAME );
	}

	/**
	 * Return Total number of objects.
	 *
	 * @param array $config Full Sync config.
	 *
	 * @return int total
	 */
	public function total( $config ) { // phpcs:ignore VariableAnalysis.CodeAnalysis.VariableAnalysis.UnusedVariable
		return 3;
	}

}