Support `macros` to serializable JSON

[medz]

Please consider using macros in future Dart 3 for serialization support, there are several benefits:

1. No need to introduce extra packages
2. No need to run additional commands to produce auxiliary content

Macros are not officially added to Dart yet, but there is an example here https://github.com/dart-lang/language/blob/master/working/macros/example/lib/json_serializable.dart

It's too early to request this feature, but I think we can discuss feasibility and implementation issues early.

[kevmoo]

Macros aren't going to happen for Dart v3.0 – but hopefully v3.x. When they show up, I'll be excited to use them!

[xVemu]

Any news on this?

[medz]

@xVemu Although it may not be appropriate to post here, I would like to say that the Dart team created the 'JSON' package and used macros to complete JSON serialization.

But although the 'json' and 'json_serializable' packages are competitive, they ultimately belong to Google, but they belong to different teams.

[medz]

I believe that once the macro is released, the Dart team's' JSON 'package will be officially available. Perhaps the Google team will discard the 'json_serializable' after discussion`

[elliotkhd]

I believe that once the macro is released, the Dart team's' JSON 'package will be officially available. Perhaps the Google team will discard the 'json_serializable' after discussion`

Only if the "json" package supports enums and all the JsonKey features

[xVemu]

This can be closed as macros are discounted