未从react应用中的私有路由调用useEffect（）

Question

如果用户已经登录，我想将其重定向到主页。但是问题是，当我从PrivateRoute（）调用useAuth（）自定义钩子时，useEffect（）未执行，因此没有用户返回信息。我正在为此项目使用Firebase身份验证，这似乎不是问题。我应该使用本地存储来存储用户信息吗？

const AuthContext = createContext();

export const AuthContextProvider = props => {
  const auth = Auth();
  return <AuthContext.Provider value={auth}>{props.children}</AuthContext.Provider>
};

export const useAuth = () => useContext(AuthContext);

export const PrivateRoute = ({ children, ...rest }) => {
  const auth = useAuth();

  return (
    <Route
      {...rest}
      render={({ location }) =>
        auth.user.email ? (
          children
        ) : (
          <Redirect
            to={{
              pathname: "/authentication",
              state: { from: location }
            }}
          />
        )
      }
    />
  );
};

const getUser = user => {
  const {displayName, email} = user;
  return {name: displayName, email};
}

const Auth = () => {
  const [user, setUser] = useState({});

  useEffect(() => {
    firebase.auth().onAuthStateChanged(function(usr){
      if(usr) {
        const currUser = getUser(usr);
        setUser({...user,currUser});
      } else{
        //Nothing
      }
    });
  }, [])

  const signInWithGoogle = () => {
    const provider = new firebase.auth.GoogleAuthProvider();
    return firebase.auth().signInWithPopup(provider)
      .then(result => {
        const signedInUser = getUser(result.user);
        setUser({...user,signedInUser});
        return result.user;
      })
      .catch(error => {
        setUser({});
        const errorMessage = error.message;
        return errorMessage;
      })
  }

  const signOut = () => {
    return firebase.auth().signOut()
      .then(() => {
        setUser({});
        console.log("signed out");
        return true;
      })
      .catch(error => {
        const errorMessage = error.message;
        console.log(errorMessage);
        return false;
      });
  }

  return {
    user,
    signInWithGoogle,
    signOut
  }
}

export default Auth;