test.dart

abstract class Test {
  final String value;

  Test(this.value);
}

abstract class Test2 {
  final String value;

  Test2(String i) : value = i;
}

class Store {}

class AppController = Test with Store;
class AppController2 = Test2 with Store;

void main() {
  var test1 = AppController(inject()); // prints 'dynamic'
  var test2 = AppController2(inject()); // prints 'String'
}

T inject<T>() {
  print(T);
}