diff --git a/src/Type/CursorResultType.php b/src/Type/CursorResultType.php
index de4ad95..be57ec0 100644
--- a/src/Type/CursorResultType.php
+++ b/src/Type/CursorResultType.php
@@ -8,8 +8,7 @@
 
 namespace Youshido\GraphQLExtension\Type;
 
-
-use Youshido\GraphQL\Config\Object\ObjectTypeConfig;
+use Youshido\GraphQL\Exception\ConfigurationException;
 use Youshido\GraphQL\Relay\Connection\Connection;
 use Youshido\GraphQL\Relay\Type\PageInfoType;
 use Youshido\GraphQL\Type\AbstractType;
@@ -19,30 +18,31 @@
 
 class CursorResultType extends AbstractObjectType
 {
-
-    private $edgeType;
+    private AbstractType $edgeType;
 
     public function __construct(AbstractType $edgeType)
     {
         parent::__construct([
-            'name'        => sprintf('Cursor%sResult', $edgeType->getName()),
+            'name' => sprintf('Cursor%sResult', $edgeType->getName()),
             'description' => sprintf('Returns list of type %s in batches', $edgeType->getName())
         ]);
         $this->edgeType = $edgeType;
     }
 
-    public function build($config)
+    /**
+     * @throws ConfigurationException
+     */
+    public function build($config): void
     {
         $config->addFields([
             'pageInfo' => [
-                'type'        => new NonNullType(new PageInfoType()),
+                'type' => new NonNullType(new PageInfoType()),
                 'description' => 'Information to aid in pagination.',
             ],
-            'edges'    => [
-                'type'        => new ListType(Connection::edgeDefinition($this->edgeType)),
+            'edges' => [
+                'type' => new ListType(Connection::edgeDefinition($this->edgeType)),
                 'description' => 'A list of edges.',
             ]
         ]);
     }
-
 }
\ No newline at end of file
diff --git a/src/Type/FileType.php b/src/Type/FileType.php
index c91206b..b15aa94 100644
--- a/src/Type/FileType.php
+++ b/src/Type/FileType.php
@@ -8,8 +8,6 @@
 
 namespace Youshido\GraphQLExtension\Type;
 
-
-use Youshido\GraphQL\Config\Object\ObjectTypeConfig;
 use Youshido\GraphQL\Type\Object\AbstractObjectType;
 use Youshido\GraphQL\Type\Scalar\DateTimeType;
 use Youshido\GraphQL\Type\Scalar\IdType;
@@ -18,22 +16,20 @@
 
 class FileType extends AbstractObjectType
 {
-    public function build($config)
+    public function build($config): void
     {
         $config->addFields([
-            'id'        => new IdType(),
-            'title'     => [
-                'type'        => new StringType(),
+            'id' => new IdType(),
+            'title' => [
+                'type' => new StringType(),
                 'description' => 'Can be used to store a more descriptive title',
             ],
             'createdAt' => new DateTimeType('c'),
             'updatedAt' => new DateTimeType('c'),
-            'url'       => new StringType(),
-            'size'      => new IntType(),
-            'name'      => new StringType(),
+            'url' => new StringType(),
+            'size' => new IntType(),
+            'name' => new StringType(),
             'extension' => new StringType(),
         ]);
     }
-
-
 }
\ No newline at end of file
diff --git a/src/Type/PaginatedResultType.php b/src/Type/PaginatedResultType.php
index cc22f0d..36a369a 100644
--- a/src/Type/PaginatedResultType.php
+++ b/src/Type/PaginatedResultType.php
@@ -8,33 +8,28 @@
 
 namespace Youshido\GraphQLExtension\Type;
 
-
-use Youshido\GraphQL\Config\Object\ObjectTypeConfig;
 use Youshido\GraphQL\Type\AbstractType;
 use Youshido\GraphQL\Type\ListType\ListType;
 use Youshido\GraphQL\Type\Object\AbstractObjectType;
-use Youshido\GraphQL\Type\Object\ObjectType;
-use Youshido\GraphQL\Type\Scalar\IntType;
 
 class PaginatedResultType extends AbstractObjectType
 {
-    private $listItemType;
+    private AbstractType $listItemType;
 
     public function __construct(AbstractType $type)
     {
         parent::__construct([
-            'name'        => sprintf('Batch%sResult', $type->getName()),
+            'name' => sprintf('Batch%sResult', $type->getName()),
             'description' => sprintf('Returns list of type %s in batches', $type->getName())
         ]);
         $this->listItemType = $type;
     }
 
-    public function build($config)
+    public function build($config): void
     {
         $config->addFields([
             'pagingInfo' => new PagingInfoType(),
-            'items'      => new ListType($this->listItemType),
+            'items' => new ListType($this->listItemType),
         ]);
     }
-
 }
\ No newline at end of file
diff --git a/src/Type/PagingInfoType.php b/src/Type/PagingInfoType.php
index 5cc3af4..5722189 100644
--- a/src/Type/PagingInfoType.php
+++ b/src/Type/PagingInfoType.php
@@ -8,18 +8,16 @@
 
 namespace Youshido\GraphQLExtension\Type;
 
-
-use Youshido\GraphQL\Config\Object\ObjectTypeConfig;
 use Youshido\GraphQL\Type\Object\AbstractObjectType;
 use Youshido\GraphQL\Type\Scalar\IntType;
 
 class PagingInfoType extends AbstractObjectType
 {
-    public function build($config)
+    public function build($config): void
     {
         $config->addFields([
-            'offset'     => new IntType(),
-            'limit'      => new IntType(),
+            'offset' => new IntType(),
+            'limit' => new IntType(),
             'totalCount' => new IntType(),
         ]);
     }
diff --git a/src/Type/PagingParamsType.php b/src/Type/PagingParamsType.php
index 8b03ad1..9ef34e4 100644
--- a/src/Type/PagingParamsType.php
+++ b/src/Type/PagingParamsType.php
@@ -8,18 +8,16 @@
 
 namespace Youshido\GraphQLExtension\Type;
 
-use Youshido\GraphQL\Config\Object\InputObjectTypeConfig;
 use Youshido\GraphQL\Type\InputObject\AbstractInputObjectType;
 use Youshido\GraphQL\Type\Scalar\IntType;
 
 class PagingParamsType extends AbstractInputObjectType
 {
-    public function build($config)
+    public function build($config): void
     {
         $this->addFields([
             'offset' => new IntType(),
-            'limit'  => new IntType(),
+            'limit' => new IntType(),
         ]);
     }
-
 }
\ No newline at end of file
diff --git a/src/Type/Sorting/SortingOrderType.php b/src/Type/Sorting/SortingOrderType.php
index bec3311..f1aea4a 100644
--- a/src/Type/Sorting/SortingOrderType.php
+++ b/src/Type/Sorting/SortingOrderType.php
@@ -1,23 +1,22 @@
 <?php
-namespace Youshido\GraphQLExtension\Type\Sorting;
 
+namespace Youshido\GraphQLExtension\Type\Sorting;
 
 use Youshido\GraphQL\Type\Enum\AbstractEnumType;
 
 class SortingOrderType extends AbstractEnumType
 {
-    public function getValues()
+    public function getValues(): array
     {
         return [
             [
-                'name'  => 'ASC',
+                'name' => 'ASC',
                 'value' => 1,
             ],
             [
-                'name'  => 'DESC',
+                'name' => 'DESC',
                 'value' => -1,
             ],
         ];
     }
-
 }
\ No newline at end of file
diff --git a/src/Type/Sorting/SortingParamsType.php b/src/Type/Sorting/SortingParamsType.php
index 8aad7ef..8e21e00 100644
--- a/src/Type/Sorting/SortingParamsType.php
+++ b/src/Type/Sorting/SortingParamsType.php
@@ -9,46 +9,43 @@
 
 class SortingParamsType extends AbstractInputObjectType
 {
-
     /** @var AbstractType */
-    private $type;
+    private AbstractType $type;
 
     /** @var array */
-    private $fields;
+    private array $fields;
 
     /** @var  string */
-    private $prefix;
+    private string $prefix;
 
     public function __construct(AbstractType $type, array $fields)
     {
-        $this->type   = $type;
+        $this->type = $type;
         $this->fields = $fields;
-        $this->prefix = sprintf("%sSorting", $type->getName());
+        $this->prefix = sprintf("%sSorting", $this->type->getName());
 
         parent::__construct([
             'name' => $this->prefix . 'Params'
         ]);
     }
 
-    public function build($config)
+    public function build($config): void
     {
         $config->addFields([
             'field' => [
-                'type'         => new EnumType([
-                    'name'   => $this->prefix . 'Fields',
+                'type' => new EnumType([
+                    'name' => $this->prefix . 'Fields',
                     'values' => array_map(function ($field) {
                         return [
-                            'name'  => $field,
+                            'name' => $field,
                             'value' => $field,
                         ];
                     }, $this->fields)
                 ]),
-                'description'  => 'Field to sort by: ' . implode(', ', $this->fields),
+                'description' => 'Field to sort by: ' . implode(', ', $this->fields),
                 'defaultValue' => 'id',
             ],
             'order' => new SortingOrderType()
         ]);
     }
-
-
 }
\ No newline at end of file