Strict done!!

overlord/src/app/client/client-list/client-list.component.ts

@@ -15,8 +15,8 @@ import { ClientListDataSource } from './client-list-datasource';
 export class ClientListComponent implements OnInit {
   @ViewChild(MatPaginator, { static: true }) paginator?: MatPaginator;
   @ViewChild(MatSort, { static: true }) sort?: MatSort;
-  dataSource: ClientListDataSource;
-  list: Client[];
+  list: Client[] = [];
+  dataSource: ClientListDataSource = new ClientListDataSource(this.list);
   /** Columns displayed in the table. Columns IDs can be added, removed, or reordered. */
   displayedColumns = ['code', 'name', 'enabled', 'otp', 'created', 'lastLogin'];
 
@@ -28,6 +28,6 @@ export class ClientListComponent implements OnInit {
 
       this.list = data.list;
     });
-    this.dataSource = new ClientListDataSource(this.paginator, this.sort, this.list);
+    this.dataSource = new ClientListDataSource(this.list, this.paginator, this.sort);
   }
 }