Fix no-floating-promises

packages/notebook-extension/src/index.ts

@@ -421,7 +421,7 @@ function activateNotebookTools(
   };
   let optionsMap: { [key: string]: JSONValue } = {};
   optionsMap.None = null;
-  services.nbconvert.getExportFormats().then(response => {
+  void services.nbconvert.getExportFormats().then(response => {
     if (response) {
       // convert exportList to palette and menu items
       const formatList = Object.keys(response);

packages/vdom-extension/src/index.ts

@@ -91,9 +91,9 @@ const plugin: JupyterFrontEndPlugin<IVDOMTracker> = {
 
     factory.widgetCreated.connect((sender, widget) => {
       widget.context.pathChanged.connect(() => {
-        tracker.save(widget);
+        void tracker.save(widget);
       });
-      tracker.add(widget);
+      void tracker.add(widget);
     });
 
     // Add widget factory to document registry.