src/Controller/EntityResource.php                           |  2 +-
 src/EventSubscriber/ResourceResponseSubscriber.php          |  1 -
 src/JsonApiResource/JsonApiDocumentTopLevel.php             | 13 +++++++++++--
 .../Value/JsonApiDocumentTopLevelNormalizerValue.php        |  9 ++++++++-
 .../Normalizer/JsonApiDocumentTopLevelNormalizerTest.php    |  2 +-
 .../Value/JsonApiDocumentTopLevelNormalizerValueTest.php    |  5 +----
 6 files changed, 22 insertions(+), 10 deletions(-)

diff --git a/src/Controller/EntityResource.php b/src/Controller/EntityResource.php
index 575ab76..87a0c84 100644
--- a/src/Controller/EntityResource.php
+++ b/src/Controller/EntityResource.php
@@ -819,7 +819,7 @@ class EntityResource {
       'has_next_page' => $entity_collection->hasNextPage(),
       'total_count' => $resource_type->includeCount()
         ? $entity_collection->getTotalCount()
-        : FALSE
+        : FALSE,
     ];
     $collection_links = $this->linkManager->getPagerLinks(\Drupal::request(), $link_context);
     $response = $this->buildWrappedResponse($entity_collection, 200, [], $collection_links);
diff --git a/src/EventSubscriber/ResourceResponseSubscriber.php b/src/EventSubscriber/ResourceResponseSubscriber.php
index bb3f3a1..2461f07 100644
--- a/src/EventSubscriber/ResourceResponseSubscriber.php
+++ b/src/EventSubscriber/ResourceResponseSubscriber.php
@@ -5,7 +5,6 @@ namespace Drupal\jsonapi\EventSubscriber;
 use Drupal\Core\Cache\CacheableResponse;
 use Drupal\Core\Cache\CacheableResponseInterface;
 use Drupal\jsonapi\Context\FieldResolver;
-use Drupal\jsonapi\Normalizer\JsonApiDocumentTopLevelNormalizer;
 use Drupal\jsonapi\Normalizer\Value\JsonApiDocumentTopLevelNormalizerValue;
 use Drupal\jsonapi\ResourceResponse;
 use Drupal\jsonapi\ResourceType\ResourceType;
diff --git a/src/JsonApiResource/JsonApiDocumentTopLevel.php b/src/JsonApiResource/JsonApiDocumentTopLevel.php
index 1dd47ac..049e755 100644
--- a/src/JsonApiResource/JsonApiDocumentTopLevel.php
+++ b/src/JsonApiResource/JsonApiDocumentTopLevel.php
@@ -25,6 +25,8 @@ class JsonApiDocumentTopLevel {
   protected $data;
 
   /**
+   * The links. Keys are link relation types.
+   *
    * @var array|\Drupal\Core\Url[]|string[]
    */
   protected $links;
@@ -40,7 +42,14 @@ class JsonApiDocumentTopLevel {
    *   relation types. Values are URLs.
    */
   public function __construct($data, array $links) {
-    assert(empty(array_diff(array_keys($links), ['self', 'first', 'next', 'prev', 'last', 'related'])));
+    assert(empty(array_diff(array_keys($links), [
+      'self',
+      'first',
+      'next',
+      'prev',
+      'last',
+      'related',
+    ])));
     assert(Inspector::assertAll(function ($v) {
       return is_string($v) || $v instanceof Url;
     }, $links));
@@ -62,7 +71,7 @@ class JsonApiDocumentTopLevel {
   /**
    * Gets the links.
    *
-   * @return \Drupal\Core\Url[] $links
+   * @return \Drupal\Core\Url[]
    *   The top-level links.
    */
   public function getLinks() {
diff --git a/src/Normalizer/Value/JsonApiDocumentTopLevelNormalizerValue.php b/src/Normalizer/Value/JsonApiDocumentTopLevelNormalizerValue.php
index 6d8465b..544f580 100644
--- a/src/Normalizer/Value/JsonApiDocumentTopLevelNormalizerValue.php
+++ b/src/Normalizer/Value/JsonApiDocumentTopLevelNormalizerValue.php
@@ -69,7 +69,14 @@ class JsonApiDocumentTopLevelNormalizerValue implements ValueExtractorInterface,
 
     $this->isCollection = $is_collection;
 
-    assert(empty(array_diff(array_keys($links), ['self', 'first', 'next', 'prev', 'last', 'related'])));
+    assert(empty(array_diff(array_keys($links), [
+      'self',
+      'first',
+      'next',
+      'prev',
+      'last',
+      'related',
+    ])));
     assert(Inspector::assertAll(function ($v) {
       return is_string($v) || $v instanceof Url;
     }, $links));
diff --git a/tests/src/Kernel/Normalizer/JsonApiDocumentTopLevelNormalizerTest.php b/tests/src/Kernel/Normalizer/JsonApiDocumentTopLevelNormalizerTest.php
index 9888175..cac1323 100644
--- a/tests/src/Kernel/Normalizer/JsonApiDocumentTopLevelNormalizerTest.php
+++ b/tests/src/Kernel/Normalizer/JsonApiDocumentTopLevelNormalizerTest.php
@@ -230,7 +230,7 @@ class JsonApiDocumentTopLevelNormalizerTest extends JsonapiKernelTestBase {
             'uid',
             'field_tags',
             'field_image',
-          ]
+          ],
         ]
       );
     $normalized = $jsonapi_doc_object->rasterizeValue();
diff --git a/tests/src/Unit/Normalizer/Value/JsonApiDocumentTopLevelNormalizerValueTest.php b/tests/src/Unit/Normalizer/Value/JsonApiDocumentTopLevelNormalizerValueTest.php
index 0467bf3..edc53fc 100644
--- a/tests/src/Unit/Normalizer/Value/JsonApiDocumentTopLevelNormalizerValueTest.php
+++ b/tests/src/Unit/Normalizer/Value/JsonApiDocumentTopLevelNormalizerValueTest.php
@@ -5,12 +5,9 @@ namespace Drupal\Tests\jsonapi\Unit\Normalizer\Value;
 use Drupal\Component\DependencyInjection\Container;
 use Drupal\Core\Entity\EntityInterface;
 use Drupal\Core\Url;
-use Drupal\jsonapi\ResourceType\ResourceType;
-use Drupal\jsonapi\LinkManager\LinkManager;
 use Drupal\jsonapi\Normalizer\Value\JsonApiDocumentTopLevelNormalizerValue;
 use Drupal\jsonapi\Normalizer\Value\RelationshipNormalizerValue;
 use Drupal\jsonapi\Normalizer\Value\FieldNormalizerValueInterface;
-use Drupal\node\NodeInterface;
 use Drupal\Tests\UnitTestCase;
 use Prophecy\Argument;
 
@@ -97,7 +94,7 @@ class JsonApiDocumentTopLevelNormalizerValueTest extends UnitTestCase {
       ->setConstructorArgs([
         ['title' => $field1->reveal(), 'field_related' => $field2->reveal()],
         [],
-        $entity->reveal()
+        $entity->reveal(),
       ])
       ->getMock();
     $this->object->method('addCacheableDependency');