class WP_Customize_Nav_Menu_Section {}

Source

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;
	}
}

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