Problem using --preview-dart-2

[nitrico]

Trying to run this app with Dart 2 causes this

compiler message: lib/main.dart:14:17: Error: A value of type '(#lib1::TodoState, #lib2::TodoAction) → #lib1::TodoState' can't be assigned to a variable of type '(dynamic, dynamic) → dynamic'.
compiler message: Try changing the type of the left hand side, or casting the right hand side to '(dynamic, dynamic) → dynamic'.
compiler message:       new Store(todoAppReducer, initialState: new TodoState.initialState());
compiler message:                 ^
[VERBOSE-2:dart_error.cc(16)] Unhandled exception:
'file:///Users/miguel/Projects/flutter-redux-todo-list/lib/main.dart': error: line 14 pos 17: lib/main.dart:14:17: Error: A value of type '(#lib1::TodoState, #lib2::TodoAction) → #lib1::TodoState' can't be assigned to a variable of type '(dynamic, dynamic) → dynamic'.
Try changing the type of the left hand side, or casting the right hand side to '(dynamic, dynamic) → dynamic'.
      new Store(todoAppReducer, initialState: new TodoState.initialState());
                ^
      new Store(todoAppReducer, initialState: new TodoState.initialState());
                ^

#0      main (file:///Users/miguel/Projects/flutter-redux-todo-list/lib/main.dart:9:14)
#1      _startIsolate.<anonymous closure> (dart:isolate/isolate_patch.dart:279:19)
#2      _RawReceivePortImpl._handleMessage (dart:isolate/isolate_patch.dart:165:12)

I tried to solve it by replacing

final Store store = new Store>(todoAppReducer, initialState: new TodoState.initialState());

with

final Store store =  new Store<TodoState>(todoAppReducer, initialState: new TodoState.initialState());

in main.dart. But then I get this error:

[VERBOSE-2:dart_error.cc(16)] Unhandled exception:
'file:///Users/miguel/Projects/flutter-redux-todo-list/lib/main.dart': error: line 14 pos 28: lib/main.dart:14:28: Error: The top level function has type '(#lib1::TodoState, #lib2::TodoAction) → #lib1::TodoState' that isn't of expected type '(#lib1::TodoState, dynamic) → #lib1::TodoState'.
Change the type of the function or the context in which it is used.
      new Store<TodoState>(todoAppReducer, initialState: new TodoState.initialState());
                           ^
      new Store<TodoState>(todoAppReducer, initialState: new TodoState.initialState());
                           ^

#0      main (file:///Users/miguel/Projects/flutter-redux-todo-list/lib/main.dart:9:14)
#1      _startIsolate.<anonymous closure> (dart:isolate/isolate_patch.dart:279:19)
#2      _RawReceivePortImpl._handleMessage (dart:isolate/isolate_patch.dart:165:12)

Any idea on how to solve it?

[xqwzts]

Thanks for reporting this @nitrico! The repository pre-dates dart 2 and I haven't tried it with --preview-dart-2 yet, I'll give it a look and update soon.

At a quick glance the culprit is probably todoAppReducer's usage of TodoAction to specify the action parameter's type, replacing that with dynamic might unblock you.

[nitrico]

Thank you, for the answer and the project :)

Yes, that's what I've tried after that and now it works fine for iOS (both debug and release) and Android in debug mode but not in release. Weird...

[voodoo]

I am wanting to dive deeper into state management but I was unable to get this to work for me. I really like this project structure but I am a flutter/dart noob.

At a quick glance the culprit is probably todoAppReducer's usage of TodoAction to specify the action parameter's type, replacing that with dynamic might unblock you.

Wish I could say that was enough to help me get running w/Dart 2 .

I tried changing the 'method signature' to something like ...

List<Todo> todosReducer(List<Todo> state, action)

Which got me closer (starts to load on iPhone 6)... embarrassingly, I'm not sure if that is stupid but it still does not boot :(

type 'Store<dynamic>' is not a subtype of type 'Store<TodoState>' Fixed that by declaring it specifically ...

final Store<TodoState> store = new Store<TodoState>(todoAppReducer, initialState: new TodoState.initialState());

... but ...

flutter: Another exception was thrown: NoSuchMethodError: The getter 'store' was called on null.

To my eyes, this app looks like a top notch implementation of a simple redux app, wish I could boot it 👍

[kieth1205]

The function 'todoAppReducer' has type '(TodoState, TodoAction) → TodoState' that isn't of expected type '(TodoState, dynamic) → TodoState'. This means its parameter or return type does not match what is expected.

=> I get this error. So how to resolve it bro????

[ipcjs]

6 fix the problem.