Namespaces in Drupal 9

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Introduction to namespaces

PHP classes, interfaces, and traits in Drupal are namespaced. See the Objected-oriented programming conventions for more information.

Namespace
Drupal\file
Drupal\file\Controller
Drupal\file\Element
Drupal\file\Entity
Drupal\file\FileUsage
Drupal\file\Plugin\EntityReferenceSelection
Drupal\file\Plugin\Field\FieldFormatter
Drupal\file\Plugin\Field\FieldType
Drupal\file\Plugin\Field\FieldWidget
Drupal\file\Plugin\migrate\destination
Drupal\file\Plugin\migrate\field\d6
Drupal\file\Plugin\migrate\field\d7
Drupal\file\Plugin\migrate\process\d6
Drupal\file\Plugin\migrate\source\d6
Drupal\file\Plugin\migrate\source\d7
Drupal\file\Plugin\rest\resource
Drupal\file\Plugin\Validation\Constraint
Drupal\file\Plugin\views\argument
Drupal\file\Plugin\views\field
Drupal\file\Plugin\views\filter
Drupal\file\Plugin\views\wizard
Drupal\file_module_test\Form
Drupal\file_test
Drupal\file_test\Form
Drupal\file_test\StreamWrapper
Drupal\file_test_get_ids\Plugin\migrate\source\d7
Drupal\filter
Drupal\filter\Annotation
Drupal\filter\Controller
Drupal\filter\Element
Drupal\filter\Entity
Drupal\filter\Form
Drupal\filter\Plugin
Drupal\filter\Plugin\DataType
Drupal\filter\Plugin\Filter
Drupal\filter\Plugin\migrate\process
Drupal\filter\Plugin\migrate\process\d6
Drupal\filter\Plugin\migrate\source\d6
Drupal\filter\Plugin\migrate\source\d7
Drupal\filter\ProxyClass
Drupal\filter\Render
Drupal\filter_test\Form
Drupal\filter_test\Plugin\Filter
Drupal\filter_test_plugin\Plugin\Filter
Drupal\form_test
Drupal\form_test\Controller
Drupal\form_test\EventSubscriber
Drupal\form_test\Form
Drupal\form_test\Plugin\Block
Drupal\form_test\StackMiddleware