Add type declarations to class properties

Author: pH-7

src/Action/User/UserCreateAction.php

@@ -11,7 +11,7 @@
 
 final class UserCreateAction
 {
-    private $userCreator;
+    private object $userCreator;
 
     public function __construct(UserCreator $userCreator)
     {

src/Domain/User/Repository/UserCreatorRepository.php

@@ -5,9 +5,6 @@
 
 use PDO;
 
-/**
- * Repository.
- */
 final class UserCreatorRepository
 {
     private const SQL_INSERT_USER = 'INSERT INTO users SET 

src/Domain/User/Service/UserCreator.php

@@ -13,10 +13,7 @@ final class UserCreator
     private const MIN_LENGTH_USERNAME = 2
     private const MAX_LENGTH_USERNAME = 16;
 
-    /**
-     * @var UserCreatorRepository
-     */
-    private $repository;
+    private UserCreatorRepository $repository;
 
     /**
      * The constructor.

src/Domain/User/User.php

@@ -7,25 +7,13 @@
 
 class User implements JsonSerializable
 {
-    /**
-     * @var int|null
-     */
-    private $id;
+    private ?int $id;
 
-    /**
-     * @var string
-     */
-    private $username;
+    private string $username;
 
-    /**
-     * @var string
-     */
-    private $firstName;
+    private string $firstName;
 
-    /**
-     * @var string
-     */
-    private $lastName;
+    private string $lastName;
 
     /**
      * @param int|null $id