[feature ask] getter to ask if the store has been torn down

[jeroldalbertson-wf]

HI 👋 Redux Team,

I've got a redux store that exists briefly and sometimes it can be disposed of while a long running middleware server call is in flight. If I try to dispatch another action to set store state following that async call, there's an exception thrown because the store's change stream has been closed. To prevent those exceptions caused by calling dispatch on a torn-down store, it would be nice to be able to ask the store if it's still open to change.

Right now I have the following extension for this, but it requires getting tricky with the onChange stream.

extension StoreSafeAsyncDispatch on Store {
  /// if a store is closed it can not dispatch actions or apply changes
  Future<bool> get isClosed async {
    var closed = false;
    await onChange.listen((_) {}, onDone: () => closed = true).cancel();
    return closed;
  }

  /// only dispatch if the store is not closed
  Future<dynamic> asyncDispatch(dynamic action) async {
    if (await isClosed) return;
    return dispatch(action);
  }
}

Thanks for your time and consideration!

[long1eu]

But when do you close the state? Where do you do store.teardown();? Also I don't think we should ever call this, because we need the Store as long as pe app is alive.

Docs say:

Closes down the Store so it will no longer be operational. Only use this
if you want to destroy the Store while your app is running. Do not use
this method as a way to stop listening to [onChange] state changes. For
that purpose, view the [onChange] documentation.