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_messagesBloc = MessagesBloc(
  Provider.of<MessagesRepository>(context),
  Provider.of<RestClient>(context),
);

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class MessagesBloc {
  MessagesBloc(
    this._repository,
    this._restClient,
  );

  final MessagesRepository _repository;
  final RestClient _restClient;
}

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@override
Widget build(BuildContext context) => MultiProvider(
      providers: [
        Provider<RestClient>.value(value: _restClient),
        Provider<MessagesRepository>.value(value: _messagesRepository),
        Provider<ThreadDataLayer>.value(
          value: ApiThreadDataLayer(
            _restClient,
            () => _imageUrlProvider.baseImageUrl().first,
          ),

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dependencies:
  provider: ^3.0.0+1

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class AuthenticationManager {
  AuthenticationManager(this._restClient);

  final RestClient _restClient;

  Future<Either<Exception, void>> logOut() =>
      _restClient.signOut(SignOutRequest()).toEither();
}

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@RestApi()
abstract class RestClient {
  factory RestClient(Dio dio) = _RestClient;

  @POST('/api/general/v1/users/signOut')
  Future<EmptyResponse> signOut(@Body() SignOutRequest request);
}

@JsonSerializable()
class EmptyResponse { … }

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dependencies:
  dio: ^3.0.7
  retrofit: ^1.0.1+1
  retrofit_generator: ^1.0.1+1

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final Response<Map<String, dynamic>> _result = await _dio.request(…);
final value = MessageDto.fromJson(_result.data);

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@JsonSerializable()
class MessageDto {
  MessageDto({this.id, this.createdUtc, this.text, this.creator});

  final String id;
  final String createdUtc;
  final String text;
  final MessageAuthorDto creator;

  static MessageDto fromJson(Map<String, dynamic> json) =>

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dependencies:
  json_annotation: ^3.0.1
  json_serializable: ^3.2.5