reset redux state by action

redux.js

# delete all state alter log out
const appReducer = combineReducers({
   todos,
   visibilityFilter
});

const rootReducer = ( state, action ) => {
  if ( action.type === LOG_OUT ) {
    state = undefined;
  }

  return appReducer(state, action)
}

const store = createStore(rootReducer);