App.tsx

    public async componentWillMount() {
        try {
            const result = await API.graphql(graphqlOperation('{ me { id name } }'));
            console.log('componentWillMount: result = ', result);
            this.setState({ loading: false, data: result.data.me });
        } catch (err) {
            this.setState({ loading: false, errors: [ err.message ] });
        }
    }