add update type

[hoilzz]

import only Update type

const CountContext = React.createContext(0);

type SetCountContextType = ImmerHook<number>[1];

const SetCountContext = React.createContext<SetCountContextType>(
  {} as SetCountContextType
);

export default function App() {
  const [count, produceCount] = useImmer(0);

  return (
    <CountContext.Provider value={count}>
      <SetCountContext.Provider value={produceCount}>
      </SetCountContext.Provider>
    </CountContext.Provider>
  );
}