class are converted to abstract class when building in AOT mode, how to avoid?

[Jim Xu]

I declare a class but only use its type, and it finally built as abstract class without constructor. I know it might be caused by tree shaking. Can I avoid it not using @pragma("vm:entry-point")?

Thanks in advance.

here is my codes:

//class will changed to abstract class

class UserData {

  String name;

  String city;

  int age;

  // @serialize(alias:xxx)

  double squares;

  bool sex;

  List<Child> children;

  Map<String, String> houses;

  Child child;

  DateTime birthday;

  UserData son;

  Map<DateTime, String> test1;

  Map<int, String> test2;

  //the constructor will be stripped

  UserData();

}

void main(){

UserData userData = JsonDrill.fromJson<UserData>(jsonDecode(str));

    var map = JsonDrill.toJson<UserData>(userData);

    String result = "----toJson---$map---";

}

[Jim Xu]

anybody help, thanks

[Johnni Winther]

+ kustermann@

How are you compiling the program? For AOT or with dart2js?

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[Jim Xu]

Thanks for reply.

I compile it for AOT

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[Vyacheslav Egorov]

Hi!

Do I understand correctly that you do some custom transformation over the Kernel representation of your program? 

In this case it would be best to embed these transformations into the pipeline *before* TFA is run - not after.

It needs to happen approximately at this point: https://github.com/dart-lang/sdk/blob/master/pkg/vm/lib/kernel_front_end.dart#L347

// Vyacheslav Egorov

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[Jim Xu]

Vyacheslav,

Thank you very much, I got it. Please allow me ask the second question: Will CFE or flutter tool provide a mechanism(pipe line) for customizing/embedding these transformation before TFA? Has it been in flutter's plate?

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[Vyacheslav Egorov]

So far we were shying away from this - because transforming kernel requires good knowledge of some internals.

However given that this is rising in popularity - we should consider exposing this in a better way. 

I will raise this question internally. 

// Vyacheslav Egorov

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[Jim Xu]

Gotcha, thanks

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