13 files declare their use of TemplateInterface in Workbench Email 2.x

Author.php in src/Plugin/RecipientType/Author.php

EmailField.php in src/Plugin/RecipientType/EmailField.php

FixedEmail.php in src/Plugin/RecipientType/FixedEmail.php

LastRevisionAuthor.php in src/Plugin/RecipientType/LastRevisionAuthor.php

RecipientTypeBase.php in src/Plugin/RecipientTypeBase.php

RecipientTypeInterface.php in src/Plugin/RecipientTypeInterface.php

Role.php in src/Plugin/RecipientType/Role.php

RolesWithAccess.php in src/Plugin/RecipientType/RolesWithAccess.php

Template.php in src/Entity/Template.php

UpdateHelper.php in src/Update/UpdateHelper.php

WorkbenchTransitionEventSubscriber.php in src/EventSubscriber/WorkbenchTransitionEventSubscriber.php

workbench_email.module in ./workbench_email.module

Provides main module functions.

workbench_email.post_update.php in ./workbench_email.post_update.php

Contains post update hooks.