Autocompletion not working in production-level TCA projects

[Sevenfortyseven]

Hey everyone,

I have two production-level projects built using The Composable Architecture and in both of them, autocompletion doesn’t work at all.

I’m not sure what kind of details or diagnostics would be most helpful to share, so please let me know what information you need from me to investigate this issue - project setup, Xcode version, build settings, etc.

Thanks in advance!

[melle]

I ran into the same issue with a relatively small project. I had the impression that something was causing the indexer to stall. I noticed that the indexing process never finished. It's likely a bug in Xcode 26. I installed Xcode 26.2 beta, and now indexing appears to be working again.

[jshier]

Yeah, autocomplete was largely fixed in 26.1RC and final, which fixed the indexer.

[jtbergman]

@Sevenfortyseven If you are still having this issue after updating to Xcode 26.1, there is an old tip here to define a core(state:action:) function and then call that from the body's Reduce builder. I find this works well for very large projects to regain code completion:

var body: some ReducerOf<Self> {
  Reduce { state, action in
    return core(state: &state, action: action)
  }
}

func core(state: inout State, action: Action) -> EffectOf<Self> {
  switch action {
    ...
  }
}

[Alex293]

Simply specify the generics like Reduce<State, Action> {} to get the same effect, though I think this is mostly fixed in recent xcode versions.