28 files declare their use of WebformEntityStorageTrait in Webform 6.x

Webform.php in src/Plugin/Condition/Webform.php

WebformAccessGroupEntityBlock.php in modules/webform_access/src/Plugin/Block/WebformAccessGroupEntityBlock.php

WebformAccessGroupStorage.php in modules/webform_access/src/WebformAccessGroupStorage.php

WebformAccessTypeListBuilder.php in modules/webform_access/src/WebformAccessTypeListBuilder.php

WebformAdminConfigFormsForm.php in src/Form/AdminConfig/WebformAdminConfigFormsForm.php

WebformDevelSubmissionApiForm.php in modules/webform_devel/src/Form/WebformDevelSubmissionApiForm.php

WebformElementBase.php in src/Plugin/WebformElementBase.php

WebformEntityAccessControlHandler.php in src/WebformEntityAccessControlHandler.php

WebformEntityFilterForm.php in src/Form/WebformEntityFilterForm.php

WebformEntityListBuilder.php in src/WebformEntityListBuilder.php

WebformExporterBase.php in src/Plugin/WebformExporterBase.php

WebformGroupManager.php in modules/webform_group/src/WebformGroupManager.php

WebformHandlerBase.php in src/Plugin/WebformHandlerBase.php

WebformMessageManager.php in src/WebformMessageManager.php

WebformNodeReferencesListController.php in modules/webform_node/src/Controller/WebformNodeReferencesListController.php

WebformOptionsCustomDeriverBase.php in modules/webform_options_custom/src/Plugin/Derivative/WebformOptionsCustomDeriverBase.php

WebformRequest.php in src/WebformRequest.php

WebformResultsCustomForm.php in src/Form/WebformResultsCustomForm.php

WebformScheduledEmailManager.php in modules/webform_scheduled_email/src/WebformScheduledEmailManager.php

WebformSubmissionDevelGenerateTrait.php in src/Plugin/DevelGenerate/WebformSubmissionDevelGenerateTrait.php

WebformSubmissionExporter.php in src/WebformSubmissionExporter.php

WebformSubmissionExportImportController.php in modules/webform_submission_export_import/src/Controller/WebformSubmissionExportImportController.php

WebformSubmissionExportImportImporter.php in modules/webform_submission_export_import/src/WebformSubmissionExportImportImporter.php

WebformSubmissionLogController.php in modules/webform_submission_log/src/Controller/WebformSubmissionLogController.php

WebformSubmissionsDeleteFormBase.php in src/Form/WebformSubmissionsDeleteFormBase.php

WebformSubmissionStorage.php in src/WebformSubmissionStorage.php

WebformTemplatesController.php in modules/webform_templates/src/Controller/WebformTemplatesController.php

WebformTemplatesFilterForm.php in modules/webform_templates/src/Form/WebformTemplatesFilterForm.php