Stencil - polyfill issue - when imported from npm

Stencil
1

Hello guys, :slight_smile:
Steps:

  1. new stencil project (@1.12.3), build it, the dist/ and loader/ folders generated
  2. new create-react-app where the project created at 1) is used like stencil suggest:
import { applyPolyfills, defineCustomElements } from 'test-components/loader';
		applyPolyfills().then(() => {
			defineCustomElements();
		});
  1. looks good in all browsers except IE. The polyfill is not applied in IE11 (Error: ‘Promise’ is undefined).
  2. if I use the scripts in index.html it works good

Is that a known issue in Stencil or am I doing something wrong (what?)?