Add missing JS file

src/js/application/elements.js

@@ -0,0 +1,33 @@
+import { LitElement } from "lit";
+
+/**
+ * LightDOMElement
+ *
+ * This is a helper class for using a light DOM with LitElement
+ * instead of a shadow DOM. Light DOM is what allows FUI styles
+ * to be used inside the element.
+ *
+ * Also adds some debugger helpers.
+ **/
+export class LightDOMElement extends LitElement {
+  // Use light DOM with inherited styles instead of shadow DOM
+  createRenderRoot() {
+    return this;
+  }
+
+  // And some debugging calls
+  connectedCallback() {
+    super.connectedCallback();
+
+    console.debug("Setting up web component instance:", this.constructor.name);
+  }
+
+  disconnectedCallback() {
+    super.disconnectedCallback();
+
+    console.debug(
+      "Disconnecting web component instance:",
+      this.constructor.name,
+    );
+  }
+}