update deps & install rector

Behavioral/Memento/Memento.php

@@ -4,23 +4,14 @@ namespace DesignPatterns\Behavioral\Memento;
 
 class Memento
 {
-    /**
-     * @var State
-     */
-    private $state;
+    private State $state;
 
-    /**
-     * @param State $stateToSave
-     */
     public function __construct(State $stateToSave)
     {
         $this->state = $stateToSave;
     }
 
-    /**
-     * @return State
-     */
-    public function getState()
+    public function getState(): State
     {
         return $this->state;
     }

Behavioral/Memento/State.php

@@ -2,6 +2,8 @@
 
 namespace DesignPatterns\Behavioral\Memento;
 
+use InvalidArgumentException;
+
 class State
 {
     const STATE_CREATED = 'created';
@@ -9,24 +11,18 @@ class State
     const STATE_ASSIGNED = 'assigned';
     const STATE_CLOSED = 'closed';
 
-    /**
-     * @var string
-     */
-    private $state;
+    private string $state;
 
     /**
      * @var string[]
      */
-    private static $validStates = [
+    private static array $validStates = [
         self::STATE_CREATED,
         self::STATE_OPENED,
         self::STATE_ASSIGNED,
         self::STATE_CLOSED,
     ];
 
-    /**
-     * @param string $state
-     */
     public function __construct(string $state)
     {
         self::ensureIsValidState($state);
@@ -37,7 +33,7 @@ class State
     private static function ensureIsValidState(string $state)
     {
         if (!in_array($state, self::$validStates)) {
-            throw new \InvalidArgumentException('Invalid state given');
+            throw new InvalidArgumentException('Invalid state given');
         }
     }
 

Behavioral/Memento/Ticket.php

@@ -7,10 +7,7 @@ namespace DesignPatterns\Behavioral\Memento;
  */
 class Ticket
 {
-    /**
-     * @var State
-     */
-    private $currentState;
+    private State $currentState;
 
     public function __construct()
     {