WIP: No errors but nothing is working

src/main/resources/static/pdfjs/js/viewer.js

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+/* Copyright 2014 Mozilla Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+"use strict";
+
+if (!pdfjsLib.getDocument || !pdfjsViewer.PDFPageView) {
+    // eslint-disable-next-line no-alert
+    alert("Please build the pdfjs-dist library using\n  `gulp dist-install`");
+}
+
+// The workerSrc property shall be specified.
+//
+pdfjsLib.GlobalWorkerOptions.workerSrc =
+    "/pdfjs/pdf.worker.js";
+
+// Some PDFs need external cmaps.
+//
+const CMAP_URL = "/pdfjs/cmaps/";
+const CMAP_PACKED = true;
+
+const DEFAULT_URL = "/pdfjs/example/compressed.tracemonkey-pldi-09.pdf";
+const PAGE_TO_VIEW = 1;
+const SCALE = 1.0;
+
+const ENABLE_XFA = true;
+
+const container = document.getElementById("pageContainer");
+
+const eventBus = new pdfjsViewer.EventBus();
+
+// Loading document.
+const loadingTask = pdfjsLib.getDocument({
+    url: DEFAULT_URL,
+    cMapUrl: CMAP_URL,
+    cMapPacked: CMAP_PACKED,
+    enableXfa: ENABLE_XFA,
+});
+(async function () {
+    const pdfDocument = await loadingTask.promise;
+    // Document loaded, retrieving the page.
+    const pdfPage = await pdfDocument.getPage(PAGE_TO_VIEW);
+
+    // Creating the page view with default parameters.
+    const pdfPageView = new pdfjsViewer.PDFPageView({
+        container,
+        id: PAGE_TO_VIEW,
+        scale: SCALE,
+        defaultViewport: pdfPage.getViewport({scale: SCALE}),
+        eventBus,
+    });
+    // Associate the actual page with the view, and draw it.
+    pdfPageView.setPdfPage(pdfPage);
+    return pdfPageView.draw();
+})();