add missing typings to code (#1050)

* remove unused parameters

* add missing types

* add missing typing information

* fix tests

* restore old code

src/app/components/sidenav/sidenav.component.ts

@@ -73,7 +73,7 @@ export class SidenavComponent implements OnInit, OnDestroy {
       });
   }
 
-  trackById(index: number, obj: { id: string }) {
+  trackById(_: number, obj: { id: string }) {
     return obj.id;
   }