How to migration to dart 2?

[granoeste]

Flutter’s second beta has Dart 2 enabled by default.
How to migration to dart 2?

══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
The following StoreProviderError was thrown building StoreConnector<dynamic, dynamic>(dirty):
Error: No StoreProvider found. To fix, please try:

• Using Dart 2 (required) by using the --preview-dart-2 flag
• Wrapping your MaterialApp with the StoreProvider, rather than an individual Route
• Providing full type information to your Store, StoreProvider and
  StoreConnector<State, ViewModel>

[alittlecup]

maybe you can look at this https://pub.dartlang.org/packages/flutter_redux#-example-tab-

[AlexUskov]

Create store as
final store = new Store(reducer, initialState: new AppState(0));
Define state for StoreProvider as StoreProvider
And define Store type and return type for StoreConnector
StoreConnector<AppState, int> for Text widget and StoreConnector<AppState, VoidCallback> for ActionButton