system_block_view_system_main_block_alter(array &$build, BlockPluginInterface $block) Implements

public DateFormatDeleteForm::getQuestion()

public SystemConfigSubscriber::onConfigImporter

template_preprocess_system_themes_page(&$variables) Prepares variables for appearance page templates.

Default theme implementation for a fieldset element and its children. Available variables: attributes:

Displays theme configuration for entire site and individual themes. Hierarchy class

public Menu::isLocked() Determines if

System Manager Service. Type:

The MIME type guesser. Type: \Symfony\Component\HttpFoundation\File\MimeType\MimeTypeGuesserInterface

public SystemManager::listRequirements()