test.js

test.js

export default class HomeScreen extends React.Component {
	constructor(props) {
		super(props);
		this.state = {token: ''};
		this.getToken = this.getToken.bind(this);
		getToken();
	}

	getToken() {
		AsyncStorage.getItem('JWT_TOKEN')
			.then((token) => {
				console.warn(token);  // Success
				this.setState({token: token});
			})
			.catch((error) => this.toast(error));
	}

	componentDidMount() {
		console.warn(this.state.token); // Fail
	}
	
	...
}