diff --git a/src/Ajax/SelectEntitiesCommand.php b/src/Ajax/SelectEntitiesCommand.php
index fc95a04..3a64bc7 100644
--- a/src/Ajax/SelectEntitiesCommand.php
+++ b/src/Ajax/SelectEntitiesCommand.php
@@ -5,8 +5,7 @@ namespace Drupal\entity_browser\Ajax;
 use Drupal\Core\Ajax\CommandInterface;
 
 /**
- * AJAX command to rerender a formatted text field without any transformation
- * filters.
+ * AJAX command to rerender a formatted text without transformation filters.
  */
 class SelectEntitiesCommand implements CommandInterface {
 
@@ -33,7 +32,7 @@ class SelectEntitiesCommand implements CommandInterface {
    *   Entities that were selected. Each entity is represented with an array
    *   consisting of three values (entity ID, entity UUID and entity type).
    */
-  public function __construct($uuid, $entities) {
+  public function __construct($uuid, array $entities) {
     $this->uuid = $uuid;
     $this->entities = $entities;
   }
diff --git a/src/Ajax/ValueUpdatedCommand.php b/src/Ajax/ValueUpdatedCommand.php
index fa08d66..9858376 100644
--- a/src/Ajax/ValueUpdatedCommand.php
+++ b/src/Ajax/ValueUpdatedCommand.php
@@ -14,7 +14,7 @@ class ValueUpdatedCommand implements CommandInterface {
    *
    * @var string
    */
-  protected $details_id;
+  protected $detailIds;
 
   /**
    * Constructor.
@@ -23,7 +23,7 @@ class ValueUpdatedCommand implements CommandInterface {
    *   The ID for the details element.
    */
   public function __construct($details_id) {
-    $this->details_id = $details_id;
+    $this->detailIds = $details_id;
   }
 
   /**
@@ -32,7 +32,7 @@ class ValueUpdatedCommand implements CommandInterface {
   public function render() {
     return [
       'command' => 'entity_browser_value_updated',
-      'details_id' => $this->details_id,
+      'details_id' => $this->detailIds,
     ];
   }
 
diff --git a/src/EntityBrowserInterface.php b/src/EntityBrowserInterface.php
index 09a5e86..88fb083 100644
--- a/src/EntityBrowserInterface.php
+++ b/src/EntityBrowserInterface.php
@@ -53,7 +53,7 @@ interface EntityBrowserInterface extends ConfigEntityInterface {
   /**
    * Sets the id of the widget selector plugin.
    *
-   * @param string $display
+   * @param string $widget_selector
    *   The id of the widget selector plugin.
    *
    * @return \Drupal\entity_browser\EntityBrowserInterface
@@ -64,7 +64,7 @@ interface EntityBrowserInterface extends ConfigEntityInterface {
   /**
    * Sets the id of the selection display plugin.
    *
-   * @param string $display
+   * @param string $selection_display
    *   The id of the selection display plugin.
    *
    * @return \Drupal\entity_browser\EntityBrowserInterface
diff --git a/src/Events/AlterEntityBrowserDisplayData.php b/src/Events/AlterEntityBrowserDisplayData.php
index 22141bf..befbe7e 100644
--- a/src/Events/AlterEntityBrowserDisplayData.php
+++ b/src/Events/AlterEntityBrowserDisplayData.php
@@ -87,7 +87,7 @@ class AlterEntityBrowserDisplayData extends EventBase {
    * @param array $data
    *   Data array.
    */
-  public function setData($data) {
+  public function setData(array $data) {
     $this->data = $data;
   }
 
diff --git a/src/Events/EntitySelectionEvent.php b/src/Events/EntitySelectionEvent.php
index ad1b9a2..cb61fcc 100644
--- a/src/Events/EntitySelectionEvent.php
+++ b/src/Events/EntitySelectionEvent.php
@@ -33,6 +33,7 @@ class EntitySelectionEvent extends EventBase {
    * Gets selected entities.
    *
    * @return \Drupal\Core\Entity\EntityInterface[]
+   *   Selected entities.
    */
   public function getEntities() {
     return $this->entities;
diff --git a/src/Events/EventBase.php b/src/Events/EventBase.php
index 9346731..bee51c1 100644
--- a/src/Events/EventBase.php
+++ b/src/Events/EventBase.php
@@ -42,7 +42,7 @@ class EventBase extends Event {
    * @return string
    *   Entity browser ID.
    */
-  public function getBrowserID() {
+  public function getBrowserId() {
     return $this->entityBrowserID;
   }
 
@@ -52,7 +52,7 @@ class EventBase extends Event {
    * @return string
    *   Entity browser instance UUID.
    */
-  public function getBrowserInstanceUUID() {
+  public function getBrowserInstanceUuid() {
     return $this->instanceUUID;
   }
 
diff --git a/src/Events/Events.php b/src/Events/Events.php
index 75345ba..09c501f 100644
--- a/src/Events/Events.php
+++ b/src/Events/Events.php
@@ -8,7 +8,9 @@ namespace Drupal\entity_browser\Events;
 final class Events {
 
   /**
-   * The SELECED event occurs when enities are selected in currently active
+   * SELECTED event.
+   *
+   * The SELECTED event occurs when entities are selected in currently active
    * widget.
    *
    * @var string
@@ -16,6 +18,8 @@ final class Events {
   const SELECTED = 'entity_browser.selected';
 
   /**
+   * DONE event.
+   *
    * The DONE event occurs when selection process is done. While it can be emitted
    * by any part of the system that will usually be done by selection display plugin.
    *
@@ -24,6 +28,8 @@ final class Events {
   const DONE = 'entity_browser.done';
 
   /**
+   * REGISTER_JS_CALLBACKS event.
+   *
    * The REGISTER_JS_CALLBACKS collects JS callbacks that need to be notified when
    * we bring selected entities back to the form. Callbacks are responsible to
    * propagate selection further to entitiy fields, etc.
@@ -33,6 +39,8 @@ final class Events {
   const REGISTER_JS_CALLBACKS = 'entity_browser.register_js_callbacks';
 
   /**
+   * ALTER_BROWSER_DISPLAY_DATA event.
+   *
    * The ALTER_BROWSER_DISPLAY_DATA allows for entity browser display plugin data
    * to be tweaked.
    *
diff --git a/src/Events/RegisterJSCallbacks.php b/src/Events/RegisterJSCallbacks.php
index 9431630..1ca3970 100644
--- a/src/Events/RegisterJSCallbacks.php
+++ b/src/Events/RegisterJSCallbacks.php
@@ -40,7 +40,7 @@ class RegisterJSCallbacks extends EventBase {
    * @param array $callbacks
    *   List of callbacks.
    */
-  public function setCallbacks($callbacks) {
+  public function setCallbacks(array $callbacks) {
     $this->callbacks = $callbacks;
   }
 
diff --git a/src/Permissions.php b/src/Permissions.php
index 6cb5683..1b6dfe5 100644
--- a/src/Permissions.php
+++ b/src/Permissions.php
@@ -32,6 +32,7 @@ class Permissions implements ContainerInjectionInterface {
    * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
    *   Entity manager service.
    * @param \Drupal\Core\StringTranslation\TranslationManager $translation
+   *   Translation manager.
    */
   public function __construct(EntityTypeManagerInterface $entity_type_manager, TranslationManager $translation) {
     $this->browserStorage = $entity_type_manager->getStorage('entity_browser');
diff --git a/src/Plugin/EntityBrowser/Widget/Upload.php b/src/Plugin/EntityBrowser/Widget/Upload.php
index a0b7edf..8c8f75d 100644
--- a/src/Plugin/EntityBrowser/Widget/Upload.php
+++ b/src/Plugin/EntityBrowser/Widget/Upload.php
@@ -98,8 +98,21 @@ class Upload extends WidgetBase {
    */
   public function getForm(array &$original_form, FormStateInterface $form_state, array $additional_widget_parameters) {
     $form = parent::getForm($original_form, $form_state, $additional_widget_parameters);
-    $field_cardinality = $form_state->get(['entity_browser', 'validators', 'cardinality', 'cardinality']);
-    $upload_validators = $form_state->has(['entity_browser', 'widget_context', 'upload_validators']) ? $form_state->get(['entity_browser', 'widget_context', 'upload_validators']) : [];
+    $field_cardinality = $form_state->get([
+      'entity_browser',
+      'validators',
+      'cardinality',
+      'cardinality',
+    ]);
+    $upload_validators = $form_state->has([
+      'entity_browser',
+      'widget_context',
+      'upload_validators',
+    ]) ? $form_state->get([
+      'entity_browser',
+      'widget_context',
+      'upload_validators',
+    ]) : [];
     $form['upload'] = [
       '#type' => 'managed_file',
       '#title' => $this->t('Choose a file'),
diff --git a/src/Plugin/EntityBrowser/WidgetSelector/DropDown.php b/src/Plugin/EntityBrowser/WidgetSelector/DropDown.php
index 497cbac..6da935c 100644
--- a/src/Plugin/EntityBrowser/WidgetSelector/DropDown.php
+++ b/src/Plugin/EntityBrowser/WidgetSelector/DropDown.php
@@ -28,7 +28,7 @@ class DropDown extends WidgetSelectorBase {
     $browser = $form_state->getFormObject()->getEntityBrowser();
 
     $widget_ids = [];
-    foreach ($this->widget_ids as $widget_id => $widget_name) {
+    foreach ($this->widgetIds as $widget_id => $widget_name) {
       if ($browser->getWidget($widget_id)->access()->isAllowed()) {
         $widget_ids[$widget_id] = $widget_name;
       }
diff --git a/src/Plugin/EntityBrowser/WidgetSelector/Tabs.php b/src/Plugin/EntityBrowser/WidgetSelector/Tabs.php
index 0128b29..fe4b3ce 100644
--- a/src/Plugin/EntityBrowser/WidgetSelector/Tabs.php
+++ b/src/Plugin/EntityBrowser/WidgetSelector/Tabs.php
@@ -23,7 +23,7 @@ class Tabs extends WidgetSelectorBase {
     $element = [];
     /** @var \Drupal\entity_browser\EntityBrowserInterface $browser */
     $browser = $form_state->getFormObject()->getEntityBrowser();
-    foreach ($this->widget_ids as $id => $label) {
+    foreach ($this->widgetIds as $id => $label) {
       $name = 'tab_selector_' . $id;
       $element[$name] = [
         '#type' => 'button',
@@ -50,7 +50,7 @@ class Tabs extends WidgetSelectorBase {
    */
   public function submit(array &$form, FormStateInterface $form_state) {
     if (($trigger = $form_state->getTriggeringElement()) && strpos($trigger['#name'], 'tab_selector_') === 0) {
-      if (!empty($this->widget_ids[$trigger['#widget_id']])) {
+      if (!empty($this->widgetIds[$trigger['#widget_id']])) {
         return $trigger['#widget_id'];
       }
     }
diff --git a/src/Plugin/Field/FieldWidget/EntityReferenceBrowserWidget.php b/src/Plugin/Field/FieldWidget/EntityReferenceBrowserWidget.php
index fb8f380..ec8952c 100644
--- a/src/Plugin/Field/FieldWidget/EntityReferenceBrowserWidget.php
+++ b/src/Plugin/Field/FieldWidget/EntityReferenceBrowserWidget.php
@@ -770,7 +770,11 @@ class EntityReferenceBrowserWidget extends WidgetBase implements ContainerFactor
     if (($trigger = $form_state->getTriggeringElement())) {
       // Can be triggered by hidden target_id element or "Remove" button.
       $last_parent = end($trigger['#parents']);
-      if (in_array($last_parent, ['target_id', 'remove_button', 'replace_button'])) {
+      if (in_array($last_parent, [
+          'target_id',
+          'remove_button',
+          'replace_button'
+        ])) {
         $is_relevant_submit = TRUE;
 
         // In case there are more instances of this widget on the same page we
diff --git a/src/Plugin/Field/FieldWidget/FileBrowserWidget.php b/src/Plugin/Field/FieldWidget/FileBrowserWidget.php
index e6b0019..db04408 100644
--- a/src/Plugin/Field/FieldWidget/FileBrowserWidget.php
+++ b/src/Plugin/Field/FieldWidget/FileBrowserWidget.php
@@ -95,10 +95,10 @@ class FileBrowserWidget extends EntityReferenceBrowserWidget {
    *   The module handler service.
    * @param \Drupal\Core\Session\AccountInterface $current_user
    *   The current user.
-   * @param \Drupal\Core\Messenger\MessengerInterface $messenger
-   *   The messenger.
    * @param \Symfony\Component\HttpFoundation\File\MimeType\MimeTypeGuesserInterface $mime_type_guesser
    *   The mime type guesser service.
+   * @param \Drupal\Core\Messenger\MessengerInterface $messenger
+   *   The messenger.
    */
   public function __construct($plugin_id, $plugin_definition, FieldDefinitionInterface $field_definition, array $settings, array $third_party_settings, EntityTypeManagerInterface $entity_type_manager, FieldWidgetDisplayManager $field_display_manager, ConfigFactoryInterface $config_factory, EntityDisplayRepositoryInterface $display_repository, ModuleHandlerInterface $module_handler, AccountInterface $current_user, MimeTypeGuesserInterface $mime_type_guesser, MessengerInterface $messenger) {
     parent::__construct($plugin_id, $plugin_definition, $field_definition, $settings, $third_party_settings, $entity_type_manager, $field_display_manager, $module_handler, $current_user, $messenger);
@@ -385,7 +385,9 @@ class FileBrowserWidget extends EntityReferenceBrowserWidget {
           ],
           '#submit' => [[get_class($this), 'removeItemSubmit']],
           '#name' => $field_machine_name . '_replace_' . $entity_id . '_' . md5(json_encode($field_parents)),
-          '#limit_validation_errors' => [array_merge($field_parents, [$field_machine_name, 'target_id'])],
+          '#limit_validation_errors' => [
+            array_merge($field_parents, [$field_machine_name, 'target_id'])
+          ],
           '#attributes' => [
             'data-entity-id' => $entity->getEntityTypeId() . ':' . $entity->id(),
             'data-row-id' => $delta,
@@ -402,7 +404,9 @@ class FileBrowserWidget extends EntityReferenceBrowserWidget {
           ],
           '#submit' => [[get_class($this), 'removeItemSubmit']],
           '#name' => $field_machine_name . '_remove_' . $entity_id . '_' . md5(json_encode($field_parents)),
-          '#limit_validation_errors' => [array_merge($field_parents, [$field_machine_name, 'target_id'])],
+          '#limit_validation_errors' => [
+            array_merge($field_parents, [$field_machine_name, 'target_id'])
+          ],
           '#attributes' => [
             'data-entity-id' => $entity->getEntityTypeId() . ':' . $entity->id(),
             'data-row-id' => $delta,
diff --git a/src/Plugin/views/field/SelectForm.php b/src/Plugin/views/field/SelectForm.php
index 30039b9..7467762 100644
--- a/src/Plugin/views/field/SelectForm.php
+++ b/src/Plugin/views/field/SelectForm.php
@@ -134,7 +134,7 @@ class SelectForm extends FieldPluginBase {
    * @param array $render
    *   An associative array containing the structure of the form.
    */
-  public function viewsForm(&$render) {
+  public function viewsForm(array &$render) {
     // Only add the bulk form options and buttons if there are results.
     if (!empty($this->view->result)) {
       // Render checkboxes for all rows.
diff --git a/src/Plugin/views/filter/ContextualBundle.php b/src/Plugin/views/filter/ContextualBundle.php
index d59ed6a..94df4e7 100644
--- a/src/Plugin/views/filter/ContextualBundle.php
+++ b/src/Plugin/views/filter/ContextualBundle.php
@@ -63,6 +63,8 @@ class ContextualBundle extends Bundle {
    *   The entity manager.
    * @param \Symfony\Component\HttpFoundation\RequestStack $request_stack
    *   A request stack symfony instance.
+   * @param \Drupal\Core\KeyValueStore\KeyValueStoreExpirableInterface $selection_storage
+   *   Selection storage.
    * @param \Drupal\Core\Entity\EntityTypeBundleInfoInterface $bundle_info_service
    *   The bundle info service.
    */
@@ -195,7 +197,7 @@ class ContextualBundle extends Bundle {
    *   TRUE if the input for this filter should be included in the view query.
    *   FALSE otherwise.
    */
-  public function acceptExposedInput($input) {
+  public function acceptExposedInput(array $input) {
 
     if (empty($this->options['exposed'])) {
       return TRUE;
diff --git a/src/RouteSubscriber.php b/src/RouteSubscriber.php
index 161ee51..e393297 100644
--- a/src/RouteSubscriber.php
+++ b/src/RouteSubscriber.php
@@ -46,7 +46,7 @@ class RouteSubscriber {
   public function routes() {
     $collection = new RouteCollection();
 
-    foreach ($this->getBrowserIDsWithRoute() as $id) {
+    foreach ($this->getBrowserIdsWithRoute() as $id) {
       /** @var $browser \Drupal\entity_browser\EntityBrowserInterface */
       $browser = $this->browserStorage->load($id);
       if ($route = $browser->route()) {
@@ -63,7 +63,7 @@ class RouteSubscriber {
    * @return array
    *   Array of browser IDs.
    */
-  protected function getBrowserIDsWithRoute() {
+  protected function getBrowserIdsWithRoute() {
     // Get all display plugins which provides the type.
     $display_plugins = $this->displayManager->getDefinitions();
     $ids = [];
diff --git a/src/SelectionDisplayBase.php b/src/SelectionDisplayBase.php
index 7591acb..6f66759 100644
--- a/src/SelectionDisplayBase.php
+++ b/src/SelectionDisplayBase.php
@@ -130,7 +130,7 @@ abstract class SelectionDisplayBase extends PluginBase implements SelectionDispl
    * {@inheritdoc}
    */
   public function checkPreselectionSupport() {
-    @trigger_error('checkPreselectionSupport method is deprecated. Use supportsPreselection instead.', E_USER_DEPRECATED);
+    @trigger_error('checkPreselectionSupport method is deprecated in entity_browser:8.2.2 and is removed from entity_browser:9.0.0. See supportsPreselection.', E_USER_DEPRECATED);
     if (!$this->getPluginDefinition()['acceptPreselection']) {
       throw new ConfigException('Used entity browser selection display does not support preselection.');
     }
diff --git a/src/SelectionDisplayInterface.php b/src/SelectionDisplayInterface.php
index e58ffa2..271a38d 100644
--- a/src/SelectionDisplayInterface.php
+++ b/src/SelectionDisplayInterface.php
@@ -65,7 +65,9 @@ interface SelectionDisplayInterface extends PluginInspectionInterface, Configura
    * If preselection is not allowed by entity browser selection display, then
    * exception will be thrown.
    *
-   * @deprecated Use ::supportsPreselection instead.
+   * @deprecated in entity_browser:8.2.2 and is removed from entity_browser:9.0.0.
+   *    Use ::supportsPreselection instead.
+   * @see ::supportsPreselection
    *
    * @throws \Drupal\Core\Config\ConfigException
    */
diff --git a/src/WidgetBase.php b/src/WidgetBase.php
index f5d2ea7..26b6017 100644
--- a/src/WidgetBase.php
+++ b/src/WidgetBase.php
@@ -311,7 +311,7 @@ abstract class WidgetBase extends PluginBase implements WidgetInterface, Contain
    *   A list of constraint violations. If the list is empty, validation
    *   succeeded.
    */
-  protected function runWidgetValidators(array $entities, $validators = []) {
+  protected function runWidgetValidators(array $entities, array $validators = []) {
     $violations = new ConstraintViolationList();
     foreach ($validators as $validator_id => $options) {
       /** @var \Drupal\entity_browser\WidgetValidationInterface $widget_validator */
@@ -334,6 +334,8 @@ abstract class WidgetBase extends PluginBase implements WidgetInterface, Contain
    *
    * @param array $entities
    *   Array of entities.
+   * @param \Drupal\Core\Form\FormStateInterface $form_state
+   *   Drupal form_state.
    */
   protected function selectEntities(array $entities, FormStateInterface $form_state) {
     $selected_entities = &$form_state->get(['entity_browser', 'selected_entities']);
@@ -356,16 +358,17 @@ abstract class WidgetBase extends PluginBase implements WidgetInterface, Contain
   }
 
   /**
-   * Allow configuration overrides at runtime based on widget context passed to
-   * this widget from the Entity Browser element.
+   * Allow configuration overrides at runtime based on widget context.
    *
-   * Widgets can override this method to replace the default behavior of
-   * replacing configuration with widget context if array keys match.
+   * Allow configuration overrides at runtime based on widget context passed to
+   * this widget from the Entity Browser element. Widgets can override this
+   * method to replace the default behavior of replacing configuration
+   * with widget context if array keys match.
    *
    * @param array $widget_context
    *   The widget context.
    */
-  protected function handleWidgetContext($widget_context) {
+  protected function handleWidgetContext(array $widget_context) {
     foreach ($this->defaultConfiguration() as $key => $value) {
       if (isset($widget_context[$key]) && isset($this->configuration[$key])) {
         $this->configuration[$key] = $widget_context[$key];
diff --git a/src/WidgetSelectorBase.php b/src/WidgetSelectorBase.php
index b71687d..d282045 100644
--- a/src/WidgetSelectorBase.php
+++ b/src/WidgetSelectorBase.php
@@ -25,7 +25,7 @@ abstract class WidgetSelectorBase extends PluginBase implements WidgetSelectorIn
    *
    * @var array
    */
-  protected $widgets_ids;
+  protected $widgetIds;
 
   /**
    * ID of the default widget.
@@ -40,7 +40,7 @@ abstract class WidgetSelectorBase extends PluginBase implements WidgetSelectorIn
   public function __construct($configuration, $plugin_id, $plugin_definition) {
     parent::__construct($configuration, $plugin_id, $plugin_definition);
     $this->setConfiguration($configuration);
-    $this->widget_ids = isset($this->configuration['widget_ids']) ? $this->configuration['widget_ids'] : [];
+    $this->widgetIds = isset($this->configuration['widget_ids']) ? $this->configuration['widget_ids'] : [];
   }
 
   /**
diff --git a/tests/fixtures/update/entity_browser.update-hook-test.php b/tests/fixtures/update/entity_browser.update-hook-test.php
index 215f7a5..bf30577 100644
--- a/tests/fixtures/update/entity_browser.update-hook-test.php
+++ b/tests/fixtures/update/entity_browser.update-hook-test.php
@@ -1,7 +1,8 @@
 <?php
 
 /**
- * @file Contains entity_browser.update-hook-test.php.
+ * @file
+ * Contains entity_browser.update-hook-test.php.
  *
  * Adds some configs to allow testing update hook.
  */
diff --git a/tests/src/Functional/EntityBrowserUITest.php b/tests/src/Functional/EntityBrowserUITest.php
index 566da15..170ffcc 100644
--- a/tests/src/Functional/EntityBrowserUITest.php
+++ b/tests/src/Functional/EntityBrowserUITest.php
@@ -29,7 +29,7 @@ class EntityBrowserUITest extends BrowserTestBase {
   /**
    * Tests entity browser UI.
    */
-  public function testEntityBrowserUI() {
+  public function testEntityBrowserUi() {
     $account = $this->drupalCreateUser([
       'administer entity browsers',
       'access test_entity_browser_iframe entity browser pages',
diff --git a/tests/src/FunctionalJavascript/EntityBrowserJavascriptTestBase.php b/tests/src/FunctionalJavascript/EntityBrowserJavascriptTestBase.php
index bece737..10fcee2 100644
--- a/tests/src/FunctionalJavascript/EntityBrowserJavascriptTestBase.php
+++ b/tests/src/FunctionalJavascript/EntityBrowserJavascriptTestBase.php
@@ -14,8 +14,8 @@ use Drupal\FunctionalJavascriptTests\JavascriptTestBase;
  *
  * @package Drupal\Tests\entity_browser\FunctionalJavascript
  *
- * @deprecated in Drupal 8.6.x, will be removed before Drupal 9.0.0.
- * Use \Drupal\Tests\entity_browser\FunctionalJavascript\EntityBrowserWebDriverTestBase instead
+ * @deprecated in drupal:8.6.x and is removed from drupal:9.0.0.
+ *   Use \Drupal\FunctionalJavascriptTests\JavascriptTestBase
  *
  * @see \Drupal\FunctionalJavascriptTests\JavascriptTestBase for more info.
  */