diff --git a/src/EventSubscriber/FeedBlockCacheExpire.php b/src/EventSubscriber/FeedBlockCacheExpire.php
index 4197dbccd70a46b72409bd29db3a129d8d8fd290..494f24c5a3cb4832a19757f5cdc30aeda131b3fd 100644
--- a/src/EventSubscriber/FeedBlockCacheExpire.php
+++ b/src/EventSubscriber/FeedBlockCacheExpire.php
@@ -2,19 +2,19 @@
 
 namespace Drupal\feed_block\EventSubscriber;
 
-use Symfony\Component\HttpKernel\Event\ResponseEvent;
 use Drupal\Core\Cache\CacheableResponseInterface;
 use Drupal\Core\Cache\Context\CacheContextsManager;
 use Drupal\Core\Config\ConfigFactoryInterface;
 use Drupal\Core\Language\LanguageManagerInterface;
 use Drupal\Core\PageCache\RequestPolicyInterface;
 use Drupal\Core\PageCache\ResponsePolicyInterface;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\Event\ResponseEvent;
 use Symfony\Component\HttpKernel\KernelEvents;
-use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 
 /**
- * Class FeedBlockCacheExpire.
+ * Expires the cache correctly.
  *
  * @package Drupal\feed_block
  */
@@ -80,7 +80,7 @@ class FeedBlockCacheExpire implements EventSubscriberInterface {
    */
   public function __construct(LanguageManagerInterface $language_manager, ConfigFactoryInterface $config_factory, RequestPolicyInterface $request_policy, ResponsePolicyInterface $response_policy, CacheContextsManager $cache_contexts_manager, $http_response_debug_cacheability_headers = FALSE) {
     $this->languageManager = $language_manager;
-    $this->config = $config_factory->get('system.performance');
+    $this->config = $config_factory->get('feed_block');
     $this->requestPolicy = $request_policy;
     $this->responsePolicy = $response_policy;
     $this->cacheContextsManager = $cache_contexts_manager;
@@ -101,10 +101,12 @@ class FeedBlockCacheExpire implements EventSubscriberInterface {
     $is_cacheable = $response instanceof CacheableResponseInterface && ($this->requestPolicy->check($request) === RequestPolicyInterface::ALLOW) && ($this->responsePolicy->check($response, $request) !== ResponsePolicyInterface::DENY);
 
     if ($is_cacheable) {
+      /** @var \Drupal\Core\Cache\CacheableResponseInterface $response */
       $response_cacheability = $response->getCacheableMetadata();
       $tags = $response_cacheability->getCacheTags();
       // Only act on pages that contain a feed_block.
       if (in_array('feed_block', $tags)) {
+        /** @var \Symfony\Component\HttpFoundation\Response $response */
         $this->setExpiresCacheLifetime($response);
       }
     }
@@ -121,7 +123,7 @@ class FeedBlockCacheExpire implements EventSubscriberInterface {
    *   A response object.
    */
   protected function setExpiresCacheLifetime(Response $response) {
-    $cache_expiration = \Drupal::config('feed_block')->get('cache_expiration');
+    $cache_expiration = $this->config->get('cache_expiration');
     if (!$cache_expiration) {
       // Default to 1 day feed cache if not specified in settings.
       $cache_expiration = 86400;
diff --git a/src/Plugin/Field/FieldFormatter/RSSFeedFormatter.php b/src/Plugin/Field/FieldFormatter/RSSFeedFormatter.php
index 5cd594ea9350205b790c99ed67e67971851cd380..d695b98dfb0116825b94bc389db9beed83e6c832 100644
--- a/src/Plugin/Field/FieldFormatter/RSSFeedFormatter.php
+++ b/src/Plugin/Field/FieldFormatter/RSSFeedFormatter.php
@@ -65,10 +65,10 @@ class RSSFeedFormatter extends FormatterBase {
           if (!isset($instance->link)) {
             break;
           }
-          $elements[$delta][$inc] = array(
+          $elements[$delta][$inc] = [
             '#theme' => 'feed_block_rss_item',
             '#title' => (string) $instance->title,
-          );
+          ];
           if (isset($instance->link->attributes()->href)) {
             // Youtube format.
             $elements[$delta][$inc]['#url'] = (string) $instance->link->attributes()->href;
diff --git a/src/Plugin/Field/FieldWidget/RSSFeedWidget.php b/src/Plugin/Field/FieldWidget/RSSFeedWidget.php
index 9432fa1804612c1a47c77ce8f58877535b4aacda..27d94f2f11b1d3a24188555a4f67af01ae91377b 100644
--- a/src/Plugin/Field/FieldWidget/RSSFeedWidget.php
+++ b/src/Plugin/Field/FieldWidget/RSSFeedWidget.php
@@ -2,15 +2,15 @@
 
 namespace Drupal\feed_block\Plugin\Field\FieldWidget;
 
+use Drupal\Core\Datetime\DateFormatterInterface;
+use Drupal\Core\Entity\EntityStorageInterface;
+use Drupal\Core\Field\FieldDefinitionInterface;
 use Drupal\Core\Field\FieldItemListInterface;
 use Drupal\Core\Field\WidgetBase;
 use Drupal\Core\Form\FormStateInterface;
-use Drupal\link\LinkItemInterface;
-use Drupal\Core\Field\FieldDefinitionInterface;
 use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
+use Drupal\link\LinkItemInterface;
 use Symfony\Component\DependencyInjection\ContainerInterface;
-use Drupal\Core\Entity\EntityStorageInterface;
-use Drupal\Core\Datetime\DateFormatterInterface;
 
 /**
  * Plugin implementation of the 'rss_feed_widget' widget.
@@ -72,7 +72,7 @@ class RSSFeedWidget extends WidgetBase implements ContainerFactoryPluginInterfac
     $element['feed_uri'] = [
       '#type' => 'url',
       '#title' => $this->t('Feed URL'),
-      '#default_value' => isset($item->feed_uri) ? $item->feed_uri : NULL,
+      '#default_value' => $item->feed_uri ?? NULL,
       '#maxlength' => 2048,
       '#link_type' => LinkItemInterface::LINK_EXTERNAL,
       '#description' => $this->t('This must be a valid RSS feed.'),
@@ -81,12 +81,12 @@ class RSSFeedWidget extends WidgetBase implements ContainerFactoryPluginInterfac
       '#type' => 'select',
       '#title' => $this->t('Number of items to display'),
       '#options' => array_combine(range(1, 100), range(1, 100)),
-      '#default_value' => isset($item->count) ? $item->count : 5,
+      '#default_value' => $item->count ?? 5,
     ];
     $element['display_date'] = [
       '#type' => 'checkbox',
       '#title' => $this->t('Display date'),
-      '#default_value' => isset($item->display_date) ? $item->display_date : 1,
+      '#default_value' => $item->display_date ?? 1,
     ];
     $date_formats = [];
     foreach ($this->dateStorage->loadMultiple() as $machine_name => $value) {
@@ -118,13 +118,13 @@ class RSSFeedWidget extends WidgetBase implements ContainerFactoryPluginInterfac
         'inverse time span' => $this->t('Time span (past dates have "-" prepended)'),
         'time span' => $this->t('Time span (with "ago/hence" appended)'),
       ],
-      '#default_value' => isset($item->date_format) ? $item->date_format : 'small',
+      '#default_value' => $item->date_format ?? 'small',
     ];
     $element['date']['custom_date_format'] = [
       '#type' => 'textfield',
       '#title' => $this->t('Custom date format'),
       '#description' => $this->t('If "Custom", see <a href="http://us.php.net/manual/en/function.date.php" target="_blank">the PHP docs</a> for date formats. Otherwise, enter the number of different time units to display, which defaults to 2.'),
-      '#default_value' => isset($item->custom_date_format) ? $item->custom_date_format : 'F j, Y',
+      '#default_value' => $item->custom_date_format ?? 'F j, Y',
     ];
     foreach ([
       'custom',
@@ -147,7 +147,7 @@ class RSSFeedWidget extends WidgetBase implements ContainerFactoryPluginInterfac
     $element['display_description'] = [
       '#type' => 'checkbox',
       '#title' => $this->t('Display description'),
-      '#default_value' => isset($item->display_description) ? $item->display_description : 1,
+      '#default_value' => $item->display_description ?? 1,
     ];
     $element['description'] = [
       '#type' => 'details',
@@ -164,13 +164,13 @@ class RSSFeedWidget extends WidgetBase implements ContainerFactoryPluginInterfac
       '#title' => $this->t('Description trim length (in characters)'),
       '#min' => 0,
       '#max' => 1024,
-      '#default_value' => isset($item->description_length) ? $item->description_length : 255,
+      '#default_value' => $item->description_length ?? 255,
       '#description' => $this->t('For no trimming, leave this field blank (i.e, "0").'),
     ];
     $element['description']['description_plaintext'] = [
       '#type' => 'checkbox',
       '#title' => $this->t('Remove HTML markup from description text.'),
-      '#default_value' => isset($item->description_plaintext) ? $item->description_plaintext : 1,
+      '#default_value' => $item->description_plaintext ?? 1,
     ];
     return $element;
   }