logout google account on aws amplify app

1import Amplify, { Auth, Hub } from 'aws-amplify';
2import awsconfig from './aws-exports';
3Amplify.configure(awsconfig);
4
5class App extends Component {
6  state = { user: null, customState: null };
7
8  componentDidMount() {
9    Hub.listen("auth", ({ payload: { event, data } }) => {
10      switch (event) {
11        case "signIn":
12          this.setState({ user: data });
13          break;
14        case "signOut":
15          this.setState({ user: null });
16          break;
17        case "customOAuthState":
18          this.setState({ customState: data });
19      }
20    });
21
22    Auth.currentAuthenticatedUser()
23      .then(user => this.setState({ user }))
24      .catch(() => console.log("Not signed in"));
25  }
26
27  render() {
28    const { user } = this.state;
29
30    return (
31      <div className="App">
32        <button onClick={() => Auth.federatedSignIn({provider: 'Facebook'})}>Open Facebook</button>
33        <button onClick={() => Auth.federatedSignIn({provider: 'Google'})}>Open Google</button>
34        <button onClick={() => Auth.federatedSignIn()}>Open Hosted UI</button>
35        <button onClick={() => Auth.signOut()}>Sign Out {user.getUsername()}</button>
36      </div>
37    );
38  }
39}