how to add oauth google signin in react native app

1import { GoogleSignin, GoogleSigninButton } from 'react-native-google-signin'; 
2render() {  
3  <GoogleSigninButton 
4  style={{ width: 192, height: 48 }}
5  size={GoogleSigninButton.Size.Wide}
6  color={GoogleSigninButton.Color.Dark}
7  onPress={this._signIn}
8  disabled={this.state.isSigninInProgress} />
9};
10