MobX dart extensions to avoid build_runner

mobx_dart_extensions.dart

void main() {
  mainContext.config = mainContext.config.clone(writePolicy: ReactiveWritePolicy.never);
  runApp(MyApp());
}

class TestCounterStore {
  // ObservableInt
  final count = 0.obs;
  // ObservableString
  final name = "olá".obs;

  int get double => count * 2;

  void increment() {
    count.value++;
    name.value = "olá " * count.value;
  }
  
}


final store = TestCounterStore();

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      home: Scaffold(
        body: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              Obs(() => Text('Hi ${store.name.value}, You have pushed the button this many times:')),
              Obs(() => Text('${store.count.value}')),
              Obs(() => Text('${store.double}')),
            ],
          ),
        ),
        floatingActionButton: FloatingActionButton(
          onPressed: store.increment,
          tooltip: 'Increment',
          child: Icon(Icons.add),
        ),
      ),
    );
  }
}

  

mobx_extensions_02.dart

extension ObsValue<T> on T {
  Observable<T> get obs => Observable(this);
}

typedef Obs = Observer;