mobx app observer with authentication

app.js

const App = observer(({ store }) => {

    const { authenticated } = store 
    if (!authenticated ) {
        return <Login
          doLogin={store.login}
          postLogin={store.showHomepage}
        />
    }

    return <div className="app">
        <div className="left">
            <h2>{`hello ${store.currentUser}`}</h2>
            <ContactList contacts={store.contacts} />
        </div>
        <div className="right">
            { renderCurrentView({ store }) }
        </div>
    </div>

})