16 files declare their use of ConditionInterface in Business Rules 2.x

BusinessRulesConditionPlugin.php in src/Plugin/BusinessRulesConditionPlugin.php

BusinessRulesConditionPluginInterface.php in src/Plugin/BusinessRulesConditionPluginInterface.php

CheckViewResultCount.php in src/Plugin/BusinessRulesCondition/CheckViewResultCount.php

CompareNumberOfResultsBetweenTwoViews.php in src/Plugin/BusinessRulesCondition/CompareNumberOfResultsBetweenTwoViews.php

Condition.php in src/Entity/Condition.php

ConditionSet.php in src/Plugin/BusinessRulesCondition/ConditionSet.php

ConditionSetController.php in src/Controller/ConditionSetController.php

DataComparison.php in src/Plugin/BusinessRulesCondition/DataComparison.php

GroupHasNodeCondition.php in modules/br_group/src/Plugin/BusinessRulesCondition/GroupHasNodeCondition.php

GroupHasUserCondition.php in modules/br_group/src/Plugin/BusinessRulesCondition/GroupHasUserCondition.php

LogicalAnd.php in src/Plugin/BusinessRulesCondition/LogicalAnd.php

LogicalOr.php in src/Plugin/BusinessRulesCondition/LogicalOr.php

UserHasRole.php in src/Plugin/BusinessRulesCondition/UserHasRole.php

UserHasRoleGroupCondition.php in modules/br_group/src/Plugin/BusinessRulesCondition/UserHasRoleGroupCondition.php

UserVariableHasRole.php in src/Plugin/BusinessRulesCondition/UserVariableHasRole.php

VariableDataComparison.php in src/Plugin/BusinessRulesCondition/VariableDataComparison.php