MDL-76583 core: Update uses of external_* classes

mod/folder/classes/external.php

@@ -14,21 +14,14 @@
 // You should have received a copy of the GNU General Public License
 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
 
-/**
- * folder external API
- *
- * @package    mod_folder
- * @category   external
- * @copyright  2015 Juan Leyva <[email protected]>
- * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
- * @since      Moodle 3.0
- */
-
 use core_course\external\helper_for_get_mods_by_courses;
-
-defined('MOODLE_INTERNAL') || die;
-
-require_once("$CFG->libdir/externallib.php");
+use core_external\external_api;
+use core_external\external_function_parameters;
+use core_external\external_multiple_structure;
+use core_external\external_single_structure;
+use core_external\external_value;
+use core_external\external_warnings;
+use core_external\util;
 
 /**
  * folder external functions
@@ -94,7 +87,7 @@ class mod_folder_external extends external_api {
     /**
      * Returns description of method result value
      *
-     * @return external_description
+     * @return \core_external\external_description
      * @since Moodle 3.0
      */
     public static function view_folder_returns() {
@@ -149,7 +142,7 @@ class mod_folder_external extends external_api {
         // Ensure there are courseids to loop through.
         if (!empty($params['courseids'])) {
 
-            list($courses, $warnings) = external_util::validate_courses($params['courseids'], $mycourses);
+            list($courses, $warnings) = util::validate_courses($params['courseids'], $mycourses);
 
             // Get the folders in this course, this function checks users visibility permissions.
             // We can avoid then additional validate_context calls.