class ProjectContainer extends Component {
    constructor(props) {
        super(props);
        this.onBeforeUnload = this.onBeforeUnload.bind(this);
    }

    componentDidMount() {
        window.addEventListener('beforeunload', this.onBeforeUnload);
    }

    componentWillUnmount() {
        window.removeEventListener('beforeunload', this.onBeforeUnload);
    }

    onBeforeUnload(event) {
        const { history } = this.props;
        if (history.location.pathname !== '/saving-package') {
            event.returnValue = 'Changes will not be saved. This action cannot be undone';
        }
    }

    render() {
        const { routes } = this.props;
        return (
            // ...routes
        );
    }
}