Problem/Motivation
See #3483037: [META] Add return types to hook implementations
Steps to reproduce
grep -P 'Drupal\\\\.*\\\\Hook\\\\.*:\\\\:(viewsData|fieldViewsData)\\\\\(\\\\\) has no return type specified' core/.phpstan-baseline.php
Proposed resolution
Add : array to hook_views_data and hook_field_views_data in views.api.php
Add : array to each of these:
Drupal\content_moderation\Hook\ContentModerationViewsHooks::viewsData()
Drupal\datetime\Hook\DatetimeViewsHooks::fieldViewsData()
Drupal\datetime_range\Hook\DatetimeRangeViewsHooks::fieldViewsData()
Drupal\dblog\Hook\DblogViewsHooks::viewsData()
Drupal\file\Hook\FileViewsHooks::fieldViewsData()
Drupal\history\Hook\HistoryViewsHooks::viewsData()
Drupal\image\Hook\ImageViewsHooks::fieldViewsData()
Drupal\media_library\Hook\MediaLibraryViewsHooks::viewsData()
Drupal\options\Hook\OptionsViewsHooks::fieldViewsData()
Drupal\views\Hook\ViewsViewsHooks::fieldViewsData()
Drupal\views\Hook\ViewsViewsHooks::viewsData()
Drupal\views_test_data\Hook\ViewsTestDataViewsExecutionHooks::fieldViewsData()
Drupal\views_test_data\Hook\ViewsTestDataViewsHooks::viewsData()
Drupal\views_ui_test_field\Hook\ViewsUiTestFieldViewsHooks::viewsData()
Update phpstan baseline./vendor/bin/phpstan --configuration=core/phpstan.neon --generate-baseline=core/.phpstan-baseline.php