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wp/wp-includes/customize/class-wp-customize-nav-menu-section.php

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+<?php
+/**
+ * Customize API: WP_Customize_Nav_Menu_Section class
+ *
+ * @package WordPress
+ * @subpackage Customize
+ * @since 4.4.0
+ */
+
+/**
+ * Customize Menu Section Class
+ *
+ * Custom section only needed in JS.
+ *
+ * @since 4.3.0
+ *
+ * @see WP_Customize_Section
+ */
+class WP_Customize_Nav_Menu_Section extends WP_Customize_Section {
+
+	/**
+	 * Control type.
+	 *
+	 * @since 4.3.0
+	 * @var string
+	 */
+	public $type = 'nav_menu';
+
+	/**
+	 * Get section parameters for JS.
+	 *
+	 * @since 4.3.0
+	 * @return array Exported parameters.
+	 */
+	public function json() {
+		$exported            = parent::json();
+		$exported['menu_id'] = (int) preg_replace( '/^nav_menu\[(-?\d+)\]/', '$1', $this->id );
+
+		return $exported;
+	}
+}