gridstack.js: ES6 module doesn't work without 'gridstack/dist/jquery' - 2 versions of jquery bundled as a result

Subject of the issue

When importing as ES6 module gridstack doesn’t recognize existing jquery import. You must import gridstack/dist/jquery for gridstack to work. This results in unnecessary 2 versions of jquery being bundled.

Your environment

• version of gridstack.js: 1.1.2
• any browser
• jquery 3.4.1, 3.5.1 tested

Steps to reproduce

Uncomment any commented line and comment out import 'gridstack/dist/jquery'

// import $ from 'jquery';
// import { jQuery } from 'jquery';
// import 'jquery';

import 'gridstack/dist/jquery'; // doesn't work without this line

import 'gridstack/dist/gridstack';
import 'gridstack/dist/gridstack.jQueryUI';
import 'gridstack/dist/gridstack-poly.min.js';
import 'gridstack/dist/jquery-ui';
import 'gridstack/dist/gridstack.css';

Expected behaviour

Importing standard jquery should be sufficient for gridstack to work.

Actual behaviour

Instead it results in the following error

gridstack.jQueryUI.js:16 Uncaught ReferenceError: jQuery is not defined
    at gridstack.jQueryUI.js:16
    at Object.15df57f963fba245a3dd1dd99844b498 (gridstack.jQueryUI.js:18)
    at newRequire (app2.a577e0b1.js:68)
    at localRequire (app2.a577e0b1.js:80)
    at Object.dc637c3e3d40dc66c1f97cf67d9d6d1f.underscore (WidgetGridView.js:13)
    at newRequire (app2.a577e0b1.js:68)
    at localRequire (app2.a577e0b1.js:80)
    at Object.e5e83521c6a34a6c4a7cb873b81ab307../V01 (V01.index.js:15)
    at newRequire (app2.a577e0b1.js:68)
    at localRequire (app2.a577e0b1.js:80)