How to use the react-native-nfc-manager.getLaunchTagEvent function in react-native-nfc-manager

_startNfc() {
        NfcManager.start({
            onSessionClosedIOS: () => {
                console.log('ios session closed');
            }
        })
            .then(result => {
                console.log('start OK', result);
            })
            .catch(error => {
                console.warn('start fail', error);
                this.setState({supported: false});
            })

        if (Platform.OS === 'android') {
            NfcManager.getLaunchTagEvent()
                .then(tag => {
                    console.log('launch tag', tag);
                    if (tag) {
                        this.setState({ tag });
                    }
                })
                .catch(err => {
                    console.log(err);
                })
            NfcManager.isEnabled()
                .then(enabled => {
                    this.setState({ enabled });
                })
                .catch(err => {
                    console.log(err);
                })