Split VPULitElement

packages/common/vpu-lit-element-jquery.js

+import {VPULitElement} from "vpu-lit-element";
+import $ from "jquery";
+
+export default class VPULitElementJQuery extends VPULitElement {
+    $(selector) {
+        return $(this._(selector));
+    }
+}

packages/common/vpu-lit-element.js

 import {LitElement} from "lit-element";
-import $ from "jquery";
 
 export default class VPULitElement extends LitElement {
-    $(selector) {
-        return $(this._(selector));
-    }
-
     _(selector) {
         return this.shadowRoot === null ? this.querySelector(selector) : this.shadowRoot.querySelector(selector);
     }