10 files declare their use of ContextInterface in Context 8.4

BlockDeleteForm.php in src/Reaction/Blocks/Form/BlockDeleteForm.php

BlockFormBase.php in src/Reaction/Blocks/Form/BlockFormBase.php

Blocks.php in src/Plugin/ContextReaction/Blocks.php

ConditionDeleteForm.php in modules/context_ui/src/Form/ConditionDeleteForm.php

context.module in ./context.module

Defines Drupal hooks for context module.

Context.php in src/Entity/Context.php

ContextReactionBlocksController.php in src/Reaction/Blocks/Controller/ContextReactionBlocksController.php

ContextReactionFormBase.php in src/Reaction/ContextReactionFormBase.php

ContextUIController.php in modules/context_ui/src/Controller/ContextUIController.php

ReactionDeleteForm.php in modules/context_ui/src/Form/ReactionDeleteForm.php