hookstore-cleanup.js

export function useStore() {
  const [ state, set ] = useState(store.state);
  if (!store.setters.includes(set)) {
    store.setters.push(set);
  }
  
  useEffect(() => () => {
    store.setters = store.setters.filter(setter => setter !== set)
  }, [])

  return [ state, store.setState ];
}