a.js

const ExpansionPack = {
  isTurnInButtonVisible: () => true,
  isSignalCheckEnabled: () => false,
  isPrewritingEnabled: () => false,
  saveDraftButtonLabel: () => "Save Draft"
}

const SignalCheck = {
  isTurnInButtonVisible: (state) => state.assignment.drafts.length > 0,
  isSignalCheckEnabled: () => true,
  isPrewritingEnabled: () => true,
  saveDraftButtonLabel: () => "Signal Check"
}

// in a reducer

{
   assignmentType: type === "BC" ? ExpansionPack : SignalCheck
}

// in a connected component

mapStateToProps = (state) => {
  isTurnInButtonVisible: state.assignment.assignmentType.isTurnInButtonVisible(state),
  //etc.
}