update deps & install rector

Structural/DataMapper/UserMapper.php

@@ -2,16 +2,12 @@
 
 namespace DesignPatterns\Structural\DataMapper;
 
+use InvalidArgumentException;
+
 class UserMapper
 {
-    /**
-     * @var StorageAdapter
-     */
-    private $adapter;
+    private StorageAdapter $adapter;
 
-    /**
-     * @param StorageAdapter $storage
-     */
     public function __construct(StorageAdapter $storage)
     {
         $this->adapter = $storage;
@@ -22,17 +18,13 @@ class UserMapper
      * in memory. Normally this kind of logic will be implemented using the Repository pattern.
      * However the important part is in mapRowToUser() below, that will create a business object from the
      * data fetched from storage
-     *
-     * @param int $id
-     *
-     * @return User
      */
     public function findById(int $id): User
     {
         $result = $this->adapter->find($id);
 
         if ($result === null) {
-            throw new \InvalidArgumentException("User #$id not found");
+            throw new InvalidArgumentException("User #$id not found");
         }
 
         return $this->mapRowToUser($result);