'jQuery is not defined' when use ES6 import
<p>My code:</p>

<pre><code>import $ from 'jquery'
import jQuery from 'jquery'
import owlCarousel from '../../node_modules/owlcarousel/owl-carousel/owl.carousel'

class App {
    …
    _initSlider() {
        $("#partners-carousel").owlCarousel();
    }
}
</code></pre>

<p>I have 'jQuery is not defined' in browser console. What's wrong?
I can use jQuery as $ in methods of this class, but not with name 'jQuery'.</p>