Error when using mobx adapter

[ksmsk]

dependencies:

environment:
  sdk: ">=2.7.0 <3.0.0"

dependencies:
  mobx: ^1.2.1
  dart_json_mapper: ^1.5.14
  dart_json_mapper_mobx: ^1.2.1
  ...
dev_dependencies:
  build_runner: ^1.0.0
  mobx_codegen: ^1.1.0
  ...

There is this error type '() => (_SyncIterator<PropertyAccessorElement>) => bool' is not a subtype of type '() => (_SyncIterator<ExecutableElement>) => bool' when using mobx_codegen and dart_json_mapper together. Eventhough it says build failed, it still manages to generate successfully.

here's the code:

void main() {
  initializeReflectable();
  JsonMapper().useAdapter(mobXAdapter);
  runApp(App());
}

///////////////////////////////////////////////////

part 'login_request_dto.g.dart';

@jsonSerializable
class LoginRequestDTO extends _LoginRequestDTO with _$LoginRequestDTO {
  static LoginRequestDTO fromJson(dynamic json) => JsonMapper.deserialize(json);
}

abstract class _LoginRequestDTO extends BaseModel with Store {
  @observable
  String app = "mobile";
  @observable
  String lang = "en";
  @observable
  String password = "";
  @observable
  String username = "";
}

BaseModel contains helper methods nothing else. I tried with constructors aswell still same error.

[k-paxian]

Not sure this error somehow related to mapper, could you please provide more consistent information. At least error stack trace should contain mapper source code or mobx adapter code

[ksmsk]

Hey @k-paxian, i made a repository to reproduce the problem. https://github.com/ksmsk/json_mapper_bug_reprod

btw im using flutter beta channel. I forgot to mention that.

Flutter 1.19.0-4.1.pre • channel beta • https://github.com/flutter/flutter.git
Framework • revision f994b76974 (7 days ago) • 2020-06-09 15:53:13 -0700
Engine • revision 9a28c3bcf4
Tools • Dart 2.9.0 (build 2.9.0-14.1.beta)

[ksmsk]

update: I dig into problem and found out the problem related to flutter beta channel's analyzer. related issue: https://github.com/dart-lang/reflectable/issues/210. reverting flutter channel to stable fixed the issue.

slightly off-topic: when will you update dart_json_mapper to build_runner_core 6? Latest build_runner no longer compatible with dart_json_mapper.

[k-paxian]

yep, reflectable library is sensible to analyzer version. Well dart_json_mapper depends heavily on reflectable library, so once it will be updated to the latest build_runner according to this issue https://github.com/dart-lang/reflectable/issues/209 then dart_json_mapper will be aligned too.

Thank you for investigation efforts :)