13 files declare their use of QueryInterface in Drupal 8

ConfigEntityStorageTest.php in core/tests/Drupal/Tests/Core/Config/Entity/ConfigEntityStorageTest.php

DedupeEntityTest.php in core/modules/migrate/tests/src/Unit/process/DedupeEntityTest.php

DrupalTest.php in core/tests/Drupal/Tests/Core/DrupalTest.php

EntityResource.php in core/modules/jsonapi/src/Controller/EntityResource.php

EntityStorageBase.php in core/lib/Drupal/Core/Entity/EntityStorageBase.php

Filter.php in core/modules/jsonapi/src/Query/Filter.php

ItemStorage.php in core/modules/aggregator/src/ItemStorage.php

MakeUniqueEntityFieldTest.php in core/modules/migrate/tests/src/Unit/process/MakeUniqueEntityFieldTest.php

Query.php in core/lib/Drupal/Core/Config/Entity/Query/Query.php

Query.php in core/lib/Drupal/Core/Entity/Query/Sql/Query.php

Query.php in core/lib/Drupal/Core/Entity/Query/Null/Query.php

SqlContentEntityStorage.php in core/lib/Drupal/Core/Entity/Sql/SqlContentEntityStorage.php

TemporaryQueryGuard.php in core/modules/jsonapi/src/Access/TemporaryQueryGuard.php