nits

Signed-off-by: Jack Cherng <jfcherng@gmail.com>

Author: jfcherng

src/DiffHelper.php

@@ -9,6 +9,13 @@
 
 final class DiffHelper
 {
+    /**
+     * The constructor.
+     */
+    private function __construct()
+    {
+    }
+
     /**
      * Get the information about available templates.
      *

src/Utility/ReverseIterator.php

@@ -4,21 +4,26 @@
 
 namespace Jfcherng\Diff\Utility;
 
-use Generator;
-
 final class ReverseIterator
 {
     const ITERATOR_GET_KEY = 1 << 1;
     const ITERATOR_GET_BOTH = 1 << 2;
 
+    /**
+     * The constructor.
+     */
+    private function __construct()
+    {
+    }
+
     /**
      * Iterate the array reversely.
      *
      * @param array $array the array
      *
-     * @return Generator
+     * @return \Generator
      */
-    public static function fromArray(array $array, int $flags = 0): Generator
+    public static function fromArray(array $array, int $flags = 0): \Generator
     {
         // it may worth unrolling if-conditions to out of for-loop
         // so it wont have to check multiple if-conditions inside each loop