wp-includes/class-wp-customize-nav-menus.php:1576Exports any wp_nav_menu() calls during the rendering of any partials.
$responsearrayarray public function export_partial_rendered_nav_menu_instances( $response ) { $response['nav_menu_instance_args'] = $this->preview_nav_menu_instance_args; return $response; }Introduced in 4.5.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-wp-customize-nav-menus.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.