Json issue in dart sdk

[김태희]

i have a problem using deleteMessages() using dart sdk.

i make a List<DelRange>  variable .

And i insert variable in deleteMessages function by parameter.

But 'JsonUnsupportedObjectError (Converting object to an encodable object failed: Instance of 'DelRange')' issue occur.

i tried to solve problem.

By Inserting following code in 'del-range.dart' file.

but it didn't work.

  Map<String, dynamic> toJson() {
    return {
      'low': low,
      'hi': hi,
      'all': all,
    };
  }

how can i do this state.

pls give me advice. 

[Gene]

Dart SDK is abandoned, the repo is archived. No one supports it at the moment.