7 files declare their use of WorkflowTransition in Workflow 8

workflow.module in ./workflow.module

Support workflows made up of arbitrary states.

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

WorkflowStateActionBase.php in src/Plugin/Action/WorkflowStateActionBase.php

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

WorkflowTransitionListBuilder.php in src/WorkflowTransitionListBuilder.php

WorkflowTransitionRevertForm.php in src/Form/WorkflowTransitionRevertForm.php

workflow_access.module in modules/workflow_access/workflow_access.module

Provides node access permissions based on workflow states.