25 files declare their use of ResourceType in JSON:API 8.2

ConfigEntityDenormalizer.php in src/Normalizer/ConfigEntityDenormalizer.php

ContentEntityDenormalizer.php in src/Normalizer/ContentEntityDenormalizer.php

CountableResourceType.php in tests/modules/jsonapi_test_collection_count/src/ResourceType/CountableResourceType.php

EntityDenormalizerBase.php in src/Normalizer/EntityDenormalizerBase.php

EntityResource.php in src/Controller/EntityResource.php

EntityResourceTest.php in tests/src/Kernel/Controller/EntityResourceTest.php

EntryPoint.php in src/Controller/EntryPoint.php

FieldItemNormalizer.php in src/Normalizer/FieldItemNormalizer.php

FieldResolver.php in src/Context/FieldResolver.php

FileUpload.php in src/Controller/FileUpload.php

Filter.php in src/Query/Filter.php

FilterTest.php in tests/src/Kernel/Query/FilterTest.php

IncludeResolver.php in src/IncludeResolver.php

JsonApiDocumentTopLevelNormalizer.php in src/Normalizer/JsonApiDocumentTopLevelNormalizer.php

JsonApiDocumentTopLevelNormalizerTest.php in tests/src/Unit/Normalizer/JsonApiDocumentTopLevelNormalizerTest.php

LabelOnlyResourceObject.php in src/JsonApiResource/LabelOnlyResourceObject.php

RelationshipFieldAccess.php in src/Access/RelationshipFieldAccess.php

ResourceIdentifier.php in src/JsonApiResource/ResourceIdentifier.php

ResourceIdentifierNormalizer.php in src/Normalizer/ResourceIdentifierNormalizer.php

ResourceIdentifierNormalizerTest.php in tests/src/Unit/Normalizer/ResourceIdentifierNormalizerTest.php

ResourceObject.php in src/JsonApiResource/ResourceObject.php

ResourceResponseValidatorTest.php in tests/src/Unit/EventSubscriber/ResourceResponseValidatorTest.php

ResourceTypeRepositoryTest.php in tests/src/Kernel/ResourceType/ResourceTypeRepositoryTest.php

Routes.php in src/Routing/Routes.php

RoutesTest.php in tests/src/Unit/Routing/RoutesTest.php