6 files declare their use of PatternDefinition in UI Patterns 8

AbstractPatternsDeriver.php in src/Plugin/Deriver/AbstractPatternsDeriver.php

LibraryPattern.php in modules/ui_patterns_library/src/Plugin/UiPatterns/Pattern/LibraryPattern.php

PatternBase.php in src/Plugin/PatternBase.php

PatternDefinitionTest.php in tests/src/Unit/Definition/PatternDefinitionTest.php

PatternsLibraryController.php in modules/ui_patterns_library/src/Controller/PatternsLibraryController.php

ui_patterns_layouts.api.php in modules/ui_patterns_layouts/ui_patterns_layouts.api.php

API file.