问使用类型安全操作创建根缩减程序

EN

import { combineReducers } from 'redux';
import auth from '../modules/auth/reducer';
import feed from '../modules/feed/reducer';
import post from '../modules/post/reducer';
import profile from '../modules/profile/reducer';
import { StateType, Reducer, RootAction } from 'typesafe-actions';
import { signOut } from 'modules/auth/actions';

const appReducer = combineReducers({
  auth,
  feed,
  post,
  profile
});

type RootState = StateType<typeof appReducer>;

const clearOnSignOutReducer: Reducer<RootState, RootAction> = (
  state,
  action
) => {
  if (action.type === signOut().type) {
    state = undefined;
  }
  return appReducer(state, action);
};

export default clearOnSignOutReducer;