diff --git a/packages/voila/src/app.ts b/packages/voila/src/app.ts
index 3e1c7ea67..f06399f2e 100644
--- a/packages/voila/src/app.ts
+++ b/packages/voila/src/app.ts
@@ -40,7 +40,7 @@ export class VoilaApp extends JupyterFrontEnd<IShell> {
   /**
    * The name of the application.
    */
-  readonly name = 'Voila';
+  readonly name: string = 'Voila';
 
   /**
    * A namespace/prefix plugins may use to denote their provenance.
@@ -136,8 +136,8 @@ export class VoilaApp extends JupyterFrontEnd<IShell> {
     return this._widgetManager;
   }
 
-  private _widgetManager: KernelWidgetManager | null = null;
-  private _widgetManagerPromise = new PromiseDelegate<KernelWidgetManager>();
+  protected _widgetManager: KernelWidgetManager | null = null;
+  protected _widgetManagerPromise = new PromiseDelegate<KernelWidgetManager>();
 }
 
 /**
diff --git a/packages/voila/src/plugins/widget.ts b/packages/voila/src/plugins/widget.ts
index bddab5804..59d579318 100644
--- a/packages/voila/src/plugins/widget.ts
+++ b/packages/voila/src/plugins/widget.ts
@@ -117,7 +117,6 @@ export const renderOutputsPlugin: JupyterFrontEndPlugin<void> = {
     const cellOutputs = document.body.querySelectorAll(
       'script[type="application/vnd.voila.cell-output+json"]'
     );
-
     cellOutputs.forEach(async (cellOutput) => {
       const model = JSON.parse(cellOutput.innerHTML);