為什么我收到下面代碼段的這個Typescript錯誤Property 'isFetching' does not exist on type 'never'.ts(2339)const mapStateToProps = (  state: AppState,  ownProps: AuthenticationPageProps): IMapStateToProps => ({  isFetching: state.authentication.isFetching,  user: state.authentication.user});但是，如果我傳播對象，它是否按預期工作？const mapStateToProps = (  state: AppState,  ownProps: AuthenticationPageProps): IMapStateToProps => {  const { isFetching, user } = state.authentication;  return { isFetching, user };};此代碼段也按預期工作：const mapStateToProps = (  state: AppState,  ownProps: AuthenticationPageProps): IMapStateToProps => ({  isFetching: state.authentication["isFetching"],  user: state.authentication["user"],});以下是我在打印時在開發(fā)人員工具中看到的內(nèi)容props這是接口IMapStateToPropsinterface IMapStateToProps {  isFetching: boolean;  user: User;}更多接口export interface AuthenticationState {  isFetching: boolean;  user: User;  errors: Error[];}export interface User {  email?: string;}export interface Error {  message: string;  status: string;}export const rootReducer = combineReducers({  authentication: authenticationReducer, // authenticationReducer returns type: AuthenticationState});export type AppState = ReturnType<typeof rootReducer>;