Added declare strict types to all files

src/Services/Trees/SidebarTreeUpdater.php

@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /*
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -17,7 +20,6 @@
  *  You should have received a copy of the GNU Affero General Public License
  *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
-
 namespace App\Services\Trees;
 
 use Symfony\Contracts\Cache\CacheInterface;
@@ -51,4 +53,4 @@ final class SidebarTreeUpdater
             return new \DateTime();
         });
     }
-}
+}

src/Services/Trees/ToolsTreeBuilder.php

@@ -68,20 +68,20 @@ class ToolsTreeBuilder
             $item->tag(['tree_tools', 'groups', $this->keyGenerator->generateKey()]);
 
             $tree = [];
-            if (!empty($this->getToolsNode())) {
+            if ($this->getToolsNode() !== []) {
                 $tree[] = (new TreeViewNode($this->translator->trans('tree.tools.tools'), null, $this->getToolsNode()))
                     ->setIcon('fa-fw fa-treeview fa-solid fa-toolbox');
             }
 
-            if (!empty($this->getEditNodes())) {
+            if ($this->getEditNodes() !== []) {
                 $tree[] = (new TreeViewNode($this->translator->trans('tree.tools.edit'), null, $this->getEditNodes()))
                     ->setIcon('fa-fw fa-treeview fa-solid fa-pen-to-square');
             }
-            if (!empty($this->getShowNodes())) {
+            if ($this->getShowNodes() !== []) {
                 $tree[] = (new TreeViewNode($this->translator->trans('tree.tools.show'), null, $this->getShowNodes()))
                     ->setIcon('fa-fw fa-treeview fa-solid fa-eye');
             }
-            if (!empty($this->getSystemNodes())) {
+            if ($this->getSystemNodes() !== []) {
                 $tree[] = (new TreeViewNode($this->translator->trans('tree.tools.system'), null, $this->getSystemNodes()))
                 ->setIcon('fa-fw fa-treeview fa-solid fa-server');
             }

src/Services/Trees/TreeViewGenerator.php

@@ -105,11 +105,11 @@ class TreeViewGenerator
                 $item->setSelected(true);
             }
 
-            if (!empty($item->getNodes())) {
+            if ($item->getNodes() !== null && $item->getNodes() !== []) {
                 $item->addTag((string) count($item->getNodes()));
             }
 
-            if (!empty($href_type) && null !== $item->getId()) {
+            if ($href_type !== '' && null !== $item->getId()) {
                 $entity = $this->em->getPartialReference($class, $item->getId());
                 $item->setHref($this->urlGenerator->getURL($entity, $href_type));
             }