6 files declare their use of CodeMirrorPluginTrait in The CodeMirror Editor 8

CodeMirrorEditor.php in src/Plugin/Filter/CodeMirrorEditor.php

CodeMirrorEditor.php in src/Plugin/Editor/CodeMirrorEditor.php

CodemirrorEditorFormatter.php in src/Plugin/Field/FieldFormatter/CodemirrorEditorFormatter.php

CodeMirrorEditorWidget.php in src/Plugin/Field/FieldWidget/CodeMirrorEditorWidget.php

TextEditorTest.php in tests/src/FunctionalJavascript/TextEditorTest.php

WidgetTestTrait.php in tests/src/FunctionalJavascript/WidgetTestTrait.php