@frontman-ai/react-statestore — Elm-architecture state management for ReScript + React

1

We just open-sourced the state management library we built for Frontman (https://frontman.sh). It’s a small ReScript-native library that gives you two things:

  • StateReducer — local component state, like useReducer but with managed side effects
  • StateStore — global store with concurrent-safe selectors via useSyncExternalStoreWithSelector
    The core idea is Elm-style: your next function is pure and returns (state, array). Effects are values, not callbacks — they run after the state update, so your reducers are trivially testable.
let next = (state, action) => {
  switch action {
  | Increment =>
    StateReducer.update(
      {count: state.count + 1},
      ~sideEffect=LogCount(state.count + 1),
    )
  | Decrement => StateReducer.update({count: state.count - 1})
  }
}
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