Implement requested changes

Author: ah-net

Model/Client/Request/Recommendations/ProductRequest.php

@@ -69,11 +69,15 @@ public function getPathSuffix()
         return '/' . $productTweakwiseId . parent::getPathSuffix();
     }
 
-    private function getSimpleProduct(Product $product)
+    /**
+     * @param Product $product
+     * @return Product
+     */
+    private function getSimpleProduct(Product $product): Product
     {
         $children = $product->getTypeInstance()->getUsedProducts($product);
         foreach ($children as $child) {
-            if ($child->isSaleable() && $child->getTypeId() === 'simple') {
+            if ($child->isSaleable() && $child->getTypeId() === Magento\Catalog\Model\Product\Type::TYPE_SIMPLE) {
                 return $child;
             }
         }

Model/Client/Response/RecommendationsResponse.php

@@ -17,8 +17,19 @@
 
 class RecommendationsResponse extends Response
 {
+    /**
+     * @var bool
+     */
     private bool $proccessedGroupedProducts = false;
 
+    /**
+     * RecommendationsResponse constructor.
+     *
+     * @param Helper $helper
+     * @param Request $request
+     * @param Config $config
+     * @param array|null $data
+     */
     public function __construct(
         Helper $helper,
         Request $request,
@@ -56,7 +67,7 @@ public function setRecommendation(array $recommendation)
     public function getItems(): array
     {
         if ($this->config->isGroupedProductsEnabled() && !$this->proccessedGroupedProducts) {
-            //manually group items since recommendations doesn't have an grouped call yet.
+            // Manually group items since recommendations doesn't have a grouped call yet.
             $items = parent::getItems();
             $groups = [];
             if (empty($items)) {

Model/Client/Type/ItemType.php

@@ -118,7 +118,10 @@ public function getUrl()
         return (string) $this->getDataValue('url');
     }
 
-    public function getGroupCodeFromAttributes()
+    /**
+     * @return string
+     */
+    public function getGroupCodeFromAttributes(): string
     {
         $attributes = $this->getDataValue('attributes');
 
@@ -132,7 +135,7 @@ public function getGroupCodeFromAttributes()
                 $attribute['name'] === 'groupcode' &&
                 isset($attribute['values']['value'])
             ) {
-                return (string)($attribute['values']['value']);
+                return (string)$attribute['values']['value'];
             }
         }