diff --git a/core/modules/book/tests/src/Unit/BookManagerTest.php b/core/modules/book/tests/src/Unit/BookManagerTest.php
index d783553..98dbd5a 100644
--- a/core/modules/book/tests/src/Unit/BookManagerTest.php
+++ b/core/modules/book/tests/src/Unit/BookManagerTest.php
@@ -102,7 +102,7 @@ public function providerTestGetBookParents() {
       // Provides a book with an existing parent.
       [
         ['pid' => 11, 'nid' => 12],
-        ['nid' => 11, 'depth' => 1, 'p1' => 11,],
+        ['nid' => 11, 'depth' => 1, 'p1' => 11],
         ['depth' => 2, 'p1' => 11, 'p2' => 12] + $empty,
       ],
       // Provides a book with two existing parents.
diff --git a/core/modules/book/tests/src/Unit/Menu/BookLocalTasksTest.php b/core/modules/book/tests/src/Unit/Menu/BookLocalTasksTest.php
index 5b7662c..7abbc5c 100644
--- a/core/modules/book/tests/src/Unit/Menu/BookLocalTasksTest.php
+++ b/core/modules/book/tests/src/Unit/Menu/BookLocalTasksTest.php
@@ -48,7 +48,7 @@ public function getBookAdminRoutes() {
    */
   public function testBookNodeLocalTasks($route) {
     $this->assertLocalTasks($route, [
-      0 => ['entity.node.book_outline_form', 'entity.node.canonical', 'entity.node.edit_form', 'entity.node.delete_form', 'entity.node.version_history',],
+      0 => ['entity.node.book_outline_form', 'entity.node.canonical', 'entity.node.edit_form', 'entity.node.delete_form', 'entity.node.version_history'],
     ]);
   }
 
diff --git a/core/modules/ckeditor/src/Plugin/Editor/CKEditor.php b/core/modules/ckeditor/src/Plugin/Editor/CKEditor.php
index d3a7f6b..255691f 100644
--- a/core/modules/ckeditor/src/Plugin/Editor/CKEditor.php
+++ b/core/modules/ckeditor/src/Plugin/Editor/CKEditor.php
@@ -109,23 +109,23 @@ public function getDefaultSettings() {
           [
             [
               'name' => $this->t('Formatting'),
-              'items' => ['Bold', 'Italic',],
+              'items' => ['Bold', 'Italic'],
             ],
             [
               'name' => $this->t('Links'),
-              'items' => ['DrupalLink', 'DrupalUnlink',],
+              'items' => ['DrupalLink', 'DrupalUnlink'],
             ],
             [
               'name' => $this->t('Lists'),
-              'items' => ['BulletedList', 'NumberedList',],
+              'items' => ['BulletedList', 'NumberedList'],
             ],
             [
               'name' => $this->t('Media'),
-              'items' => ['Blockquote', 'DrupalImage',],
+              'items' => ['Blockquote', 'DrupalImage'],
             ],
             [
               'name' => $this->t('Tools'),
-              'items' => ['Source',],
+              'items' => ['Source'],
             ],
           ],
         ],
diff --git a/core/modules/ckeditor/src/Tests/CKEditorAdminTest.php b/core/modules/ckeditor/src/Tests/CKEditorAdminTest.php
index ed08c26..3541f0f 100644
--- a/core/modules/ckeditor/src/Tests/CKEditorAdminTest.php
+++ b/core/modules/ckeditor/src/Tests/CKEditorAdminTest.php
@@ -84,23 +84,23 @@ function testExistingFormat() {
           [
             [
               'name' => 'Formatting',
-              'items' => ['Bold', 'Italic',],
+              'items' => ['Bold', 'Italic'],
             ],
             [
               'name' => 'Links',
-              'items' => ['DrupalLink', 'DrupalUnlink',],
+              'items' => ['DrupalLink', 'DrupalUnlink'],
             ],
             [
               'name' => 'Lists',
-              'items' => ['BulletedList', 'NumberedList',],
+              'items' => ['BulletedList', 'NumberedList'],
             ],
             [
               'name' => 'Media',
-              'items' => ['Blockquote', 'DrupalImage',],
+              'items' => ['Blockquote', 'DrupalImage'],
             ],
             [
               'name' => 'Tools',
-              'items' => ['Source',],
+              'items' => ['Source'],
             ],
           ],
         ],
diff --git a/core/modules/ckeditor/tests/modules/src/Kernel/CKEditorTest.php b/core/modules/ckeditor/tests/modules/src/Kernel/CKEditorTest.php
index 9e159c3..4bfda7e 100644
--- a/core/modules/ckeditor/tests/modules/src/Kernel/CKEditorTest.php
+++ b/core/modules/ckeditor/tests/modules/src/Kernel/CKEditorTest.php
@@ -463,23 +463,23 @@ protected function getDefaultToolbarConfig() {
     return [
       [
         'name' => 'Formatting',
-        'items' => ['Bold', 'Italic',],
+        'items' => ['Bold', 'Italic'],
       ],
       [
         'name' => 'Links',
-        'items' => ['DrupalLink', 'DrupalUnlink',],
+        'items' => ['DrupalLink', 'DrupalUnlink'],
       ],
       [
         'name' => 'Lists',
-        'items' => ['BulletedList', 'NumberedList',],
+        'items' => ['BulletedList', 'NumberedList'],
       ],
       [
         'name' => 'Media',
-        'items' => ['Blockquote', 'DrupalImage',],
+        'items' => ['Blockquote', 'DrupalImage'],
       ],
       [
         'name' => 'Tools',
-        'items' => ['Source',],
+        'items' => ['Source', ],
       ],
       '/',
     ];
diff --git a/core/modules/config/src/Tests/ConfigEntityListTest.php b/core/modules/config/src/Tests/ConfigEntityListTest.php
index fbc7ad6..161944b 100644
--- a/core/modules/config/src/Tests/ConfigEntityListTest.php
+++ b/core/modules/config/src/Tests/ConfigEntityListTest.php
@@ -51,7 +51,7 @@ function testList() {
 
     // Test getOperations() method.
     $expected_operations = [
-      'edit' =>  [
+      'edit' => [
         'title' => t('Edit'),
         'weight' => 10,
         'url' => $entity->urlInfo(),
@@ -61,7 +61,7 @@ function testList() {
         'weight' => 40,
         'url' => $entity->urlInfo('disable'),
       ],
-      'delete' =>  [
+      'delete' => [
         'title' => t('Delete'),
         'weight' => 100,
         'url' => $entity->urlInfo('delete-form'),
diff --git a/core/modules/field/tests/src/Kernel/FieldDataCountTest.php b/core/modules/field/tests/src/Kernel/FieldDataCountTest.php
index 2bbe24d..69b84a9 100644
--- a/core/modules/field/tests/src/Kernel/FieldDataCountTest.php
+++ b/core/modules/field/tests/src/Kernel/FieldDataCountTest.php
@@ -112,7 +112,7 @@ public function testEntityCountAndHasData() {
 
     $entity_init = $this->container->get('entity_type.manager')
       ->getStorage($entity_type)
-      ->create(['type' => $entity_type,]);
+      ->create(['type' => $entity_type]);
     $cardinality = $this->fieldTestData->field_storage_2->getCardinality();
 
     $this->assertIdentical($this->fieldTestData->field_storage_2->hasData(), FALSE, 'There are no entities with field data.');
diff --git a/core/modules/field/tests/src/Kernel/Migrate/d6/MigrateFieldFormatterSettingsTest.php b/core/modules/field/tests/src/Kernel/Migrate/d6/MigrateFieldFormatterSettingsTest.php
index edf6dc0..9775c5b 100644
--- a/core/modules/field/tests/src/Kernel/Migrate/d6/MigrateFieldFormatterSettingsTest.php
+++ b/core/modules/field/tests/src/Kernel/Migrate/d6/MigrateFieldFormatterSettingsTest.php
@@ -138,7 +138,7 @@ public function testEntityDisplaySettings() {
     $this->assertIdentical($expected, $component);
 
     // Test date field.
-    $defaults = ['format_type' => 'fallback', 'timezone_override' => '',];
+    $defaults = ['format_type' => 'fallback', 'timezone_override' => ''];
     $expected['weight'] = 10;
     $expected['type'] = 'datetime_default';
     $expected['settings'] = ['format_type' => 'fallback'] + $defaults;
diff --git a/core/modules/field_ui/src/Tests/ManageDisplayTest.php b/core/modules/field_ui/src/Tests/ManageDisplayTest.php
index 9c8798f..3f6c480 100644
--- a/core/modules/field_ui/src/Tests/ManageDisplayTest.php
+++ b/core/modules/field_ui/src/Tests/ManageDisplayTest.php
@@ -87,7 +87,7 @@ function testFormatterUI() {
     $options = array_map(function($item) {
       return (string) $item->attributes()->value[0];
     }, $result);
-    $expected_options =  [
+    $expected_options = [
       'field_no_settings',
       'field_empty_test',
       'field_empty_setting',
@@ -249,7 +249,7 @@ public function testWidgetUI() {
     $options = array_map(function($item) {
       return (string) $item->attributes()->value[0];
     }, $result);
-    $expected_options =  [
+    $expected_options = [
       'test_field_widget',
       'test_field_widget_multiple',
     ];
diff --git a/core/modules/field_ui/tests/src/Kernel/EntityDisplayTest.php b/core/modules/field_ui/tests/src/Kernel/EntityDisplayTest.php
index 9e46d82..4a0e533 100644
--- a/core/modules/field_ui/tests/src/Kernel/EntityDisplayTest.php
+++ b/core/modules/field_ui/tests/src/Kernel/EntityDisplayTest.php
@@ -129,7 +129,7 @@ public function testEntityDisplayCRUDSort() {
     $display->save();
     $components = array_keys($display->getComponents());
     // The name field is not configurable so will be added automatically.
-    $expected =  [ 0 => 'component_1', 1 => 'component_2', 2 => 'component_3', 'name'];
+    $expected = [ 0 => 'component_1', 1 => 'component_2', 2 => 'component_3', 'name'];
     $this->assertIdentical($components, $expected);
   }
 
diff --git a/core/modules/history/history.module b/core/modules/history/history.module
index 58f40de..f36121e 100644
--- a/core/modules/history/history.module
+++ b/core/modules/history/history.module
@@ -28,7 +28,7 @@ function history_help($route_name, RouteMatchInterface $route_match) {
   switch ($route_name) {
     case 'help.page.history':
       $output  = '<h3>' . t('About') . '</h3>';
-      $output .= '<p>' . t('The History module keeps track of which content a user has read. It marks content as <em>new</em> or <em>updated</em> depending on the last time the user viewed it. History records that are older than one month are removed during cron, which means that content older than one month is always considered <em>read</em>. The History module does not have a user interface but it provides a filter to <a href=":views-help">Views</a> to show new or updated content. For more information, see the <a href=":url">online documentation for the History module</a>.', [':views-help' => (\Drupal::moduleHandler()->moduleExists('views')) ? \Drupal::url('help.page',  ['name' => 'views']) : '#', ':url' => 'https://www.drupal.org/documentation/modules/history']) . '</p>';
+      $output .= '<p>' . t('The History module keeps track of which content a user has read. It marks content as <em>new</em> or <em>updated</em> depending on the last time the user viewed it. History records that are older than one month are removed during cron, which means that content older than one month is always considered <em>read</em>. The History module does not have a user interface but it provides a filter to <a href=":views-help">Views</a> to show new or updated content. For more information, see the <a href=":url">online documentation for the History module</a>.', [':views-help' => (\Drupal::moduleHandler()->moduleExists('views')) ? \Drupal::url('help.page', ['name' => 'views']) : '#', ':url' => 'https://www.drupal.org/documentation/modules/history']) . '</p>';
       return $output;
   }
 }
diff --git a/core/modules/link/src/Plugin/Field/FieldFormatter/LinkFormatter.php b/core/modules/link/src/Plugin/Field/FieldFormatter/LinkFormatter.php
index 30fcd8e..b0928b0 100644
--- a/core/modules/link/src/Plugin/Field/FieldFormatter/LinkFormatter.php
+++ b/core/modules/link/src/Plugin/Field/FieldFormatter/LinkFormatter.php
@@ -216,7 +216,7 @@ public function viewElements(FieldItemListInterface $items, $langcode) {
         $element[$delta]['#url'] = $url;
 
         if (!empty($item->_attributes)) {
-          $element[$delta]['#options'] +=  ['attributes' => []];
+          $element[$delta]['#options'] += ['attributes' => []];
           $element[$delta]['#options']['attributes'] += $item->_attributes;
           // Unset field item attributes since they have been included in the
           // formatter output and should not be rendered in the field template.
diff --git a/core/modules/shortcut/tests/src/Unit/Menu/ShortcutLocalTasksTest.php b/core/modules/shortcut/tests/src/Unit/Menu/ShortcutLocalTasksTest.php
index ee9a655..09b6468 100644
--- a/core/modules/shortcut/tests/src/Unit/Menu/ShortcutLocalTasksTest.php
+++ b/core/modules/shortcut/tests/src/Unit/Menu/ShortcutLocalTasksTest.php
@@ -26,7 +26,7 @@ protected function setUp() {
    */
   public function testShortcutPageLocalTasks($route) {
     $tasks = [
-      0 => ['shortcut.set_switch', 'entity.user.canonical', 'entity.user.edit_form',],
+      0 => ['shortcut.set_switch', 'entity.user.canonical', 'entity.user.edit_form'],
     ];
     $this->assertLocalTasks($route, $tasks);
   }
diff --git a/core/modules/system/system.install b/core/modules/system/system.install
index fadf17f..f9c72f7 100644
--- a/core/modules/system/system.install
+++ b/core/modules/system/system.install
@@ -127,7 +127,7 @@ function system_requirements($phase) {
     }
 
     if ($rewrite_warning) {
-      $requirements['apache_version'] =  [
+      $requirements['apache_version'] = [
         'title' => t('Apache version'),
         'value' => $apache_version_string,
         'severity' => REQUIREMENT_WARNING,
@@ -136,7 +136,7 @@ function system_requirements($phase) {
     }
 
     if ($rewrite_error) {
-      $requirements['Apache version'] =  [
+      $requirements['Apache version'] = [
         'title' => t('Apache version'),
         'value' => $apache_version_string,
         'severity' => REQUIREMENT_ERROR,
@@ -145,7 +145,7 @@ function system_requirements($phase) {
     }
 
     if (!$rewrite_error && !$rewrite_warning) {
-      $requirements['rewrite_module'] =  [
+      $requirements['rewrite_module'] = [
         'title' => t('Clean URLs'),
         'value' => t('Disabled'),
         'severity' => REQUIREMENT_WARNING,
diff --git a/core/modules/toolbar/src/Tests/ToolbarAdminMenuTest.php b/core/modules/toolbar/src/Tests/ToolbarAdminMenuTest.php
index e78f463..b5435dc 100644
--- a/core/modules/toolbar/src/Tests/ToolbarAdminMenuTest.php
+++ b/core/modules/toolbar/src/Tests/ToolbarAdminMenuTest.php
@@ -179,7 +179,7 @@ function testUserRoleUpdateSubtreesHashCacheClear() {
 
     $this->hash = $this->getSubtreesHash();
 
-    $rid = $this->drupalCreateRole(['administer content types',]);
+    $rid = $this->drupalCreateRole(['administer content types']);
 
     // Assign the role to the user.
     $this->drupalPostForm('user/' . $this->adminUser->id() . '/edit', ["roles[$rid]" => $rid], t('Save'));
@@ -214,7 +214,7 @@ function testNonCurrentUserAccountUpdates() {
 
     // adminUser2 will add a role to adminUser.
     $this->drupalLogin($this->adminUser2);
-    $rid = $this->drupalCreateRole(['administer content types',]);
+    $rid = $this->drupalCreateRole(['administer content types']);
 
     // Get the subtree hash for adminUser2 to check later that it has not
     // changed. Request a new page to refresh the drupalSettings object.
diff --git a/core/modules/update/update.manager.inc b/core/modules/update/update.manager.inc
index 541ab6f..e796007 100644
--- a/core/modules/update/update.manager.inc
+++ b/core/modules/update/update.manager.inc
@@ -150,7 +150,7 @@ function _update_manager_check_backends(&$form, $operation) {
 function update_manager_archive_extract($file, $directory) {
   $archiver = archiver_get_archiver($file);
   if (!$archiver) {
-    throw new Exception(t('Cannot extract %file, not a valid archive.',  ['%file' => $file]));
+    throw new Exception(t('Cannot extract %file, not a valid archive.', ['%file' => $file]));
   }
 
   // Remove the directory if it exists, otherwise it might contain a mixture of
diff --git a/core/modules/user/src/Entity/User.php b/core/modules/user/src/Entity/User.php
index 38f0f39..66a4954 100644
--- a/core/modules/user/src/Entity/User.php
+++ b/core/modules/user/src/Entity/User.php
@@ -455,7 +455,7 @@ public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
       // @todo: A default value of NULL is ignored, so we have to specify
       // an empty field item structure instead. Fix this in
       // https://www.drupal.org/node/2318605.
-      ->setDefaultValue([0 =>  ['value' => NULL]])
+      ->setDefaultValue([0 => ['value' => NULL]])
       // @todo: Define this via an options provider once
       // https://www.drupal.org/node/2329937 is completed.
       ->addPropertyConstraints('value', [
diff --git a/core/modules/user/tests/src/Unit/Menu/UserLocalTasksTest.php b/core/modules/user/tests/src/Unit/Menu/UserLocalTasksTest.php
index 106e091..b9986c9 100644
--- a/core/modules/user/tests/src/Unit/Menu/UserLocalTasksTest.php
+++ b/core/modules/user/tests/src/Unit/Menu/UserLocalTasksTest.php
@@ -44,7 +44,7 @@ public function getUserAdminRoutes() {
    */
   public function testUserLoginLocalTasks($route) {
     $tasks = [
-      0 => ['user.register', 'user.pass', 'user.login',],
+      0 => ['user.register', 'user.pass', 'user.login'],
     ];
     $this->assertLocalTasks($route, $tasks);
   }
@@ -67,7 +67,7 @@ public function getUserLoginRoutes() {
    */
   public function testUserPageLocalTasks($route, $subtask = []) {
     $tasks = [
-      0 => ['entity.user.canonical', 'entity.user.edit_form',],
+      0 => ['entity.user.canonical', 'entity.user.edit_form'],
     ];
     if ($subtask) $tasks[] = $subtask;
     $this->assertLocalTasks($route, $tasks);
diff --git a/core/modules/views/src/Plugin/views/field/FieldPluginBase.php b/core/modules/views/src/Plugin/views/field/FieldPluginBase.php
index 8291fed..d948540 100644
--- a/core/modules/views/src/Plugin/views/field/FieldPluginBase.php
+++ b/core/modules/views/src/Plugin/views/field/FieldPluginBase.php
@@ -781,7 +781,7 @@ public function buildOptionsForm(&$form, FormStateInterface $form_state) {
             ':input[name="options[alter][make_link]"]' => ['checked' => TRUE],
           ],
         ],
-       '#options' => [
+        '#options' => [
           'none' => $this->t('No transform'),
           'upper' => $this->t('Upper case'),
           'lower' => $this->t('Lower case'),
diff --git a/core/modules/views/tests/src/Kernel/ViewsHooksTest.php b/core/modules/views/tests/src/Kernel/ViewsHooksTest.php
index 612934e..aceda8f 100644
--- a/core/modules/views/tests/src/Kernel/ViewsHooksTest.php
+++ b/core/modules/views/tests/src/Kernel/ViewsHooksTest.php
@@ -26,7 +26,7 @@ class ViewsHooksTest extends ViewsKernelTestBase {
    *
    * @var array
    */
-  protected static $hooks =  [
+  protected static $hooks = [
     'views_data' => 'all',
     'views_data_alter' => 'alter',
     'views_query_substitutions' => 'view',
diff --git a/core/tests/Drupal/KernelTests/Core/Config/ConfigSchemaTest.php b/core/tests/Drupal/KernelTests/Core/Config/ConfigSchemaTest.php
index 5554fb2..84aa271 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/ConfigSchemaTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/ConfigSchemaTest.php
@@ -342,7 +342,7 @@ public function testConfigSaveWithSchema() {
       ],
       'float' => '3.14',
       'null_float' => '',
-      'sequence' =>  [1, 0, 1],
+      'sequence' => [1, 0, 1],
       'sequence_bc' => [1, 0, 1],
       // Not in schema and therefore should be left untouched.
       'not_present_in_schema' => TRUE,
@@ -365,7 +365,7 @@ public function testConfigSaveWithSchema() {
       ],
       'float' => 3.14,
       'null_float' => NULL,
-      'sequence' =>  [TRUE, FALSE, TRUE],
+      'sequence' => [TRUE, FALSE, TRUE],
       'sequence_bc' => [TRUE, FALSE, TRUE],
       'not_present_in_schema' => TRUE,
       'config_schema_test_integer' => 1,
diff --git a/core/tests/Drupal/Tests/Component/Gettext/PoHeaderTest.php b/core/tests/Drupal/Tests/Component/Gettext/PoHeaderTest.php
index e106fec..113f6cd 100644
--- a/core/tests/Drupal/Tests/Component/Gettext/PoHeaderTest.php
+++ b/core/tests/Drupal/Tests/Component/Gettext/PoHeaderTest.php
@@ -279,7 +279,7 @@ public function providerTestPluralsFormula() {
           193 => 1,
           194 => 1,
           'default' => 2,
-        ],],
+        ], ],
       [
         'nplurals=4; plural=(((n==1)||(n==11))?(0):(((n==2)||(n==12))?(1):(((n>2)&&(n<20))?(2):3)));',
         [