Merge pull request #11839 from IgniteUI/mkirova/fix-unresolved-type-14.0.x

fix(igxHierarchicalGrid): Add explicit type and import for excelStyle…

Author: ChronosSF

projects/igniteui-angular/src/lib/grids/hierarchical-grid/hierarchical-grid.component.ts

@@ -42,6 +42,7 @@ import { IgxPaginatorComponent } from '../../paginator/paginator.component';
 import { IgxGridComponent } from '../grid/grid.component';
 import { IgxOverlayOutletDirective } from '../../directives/toggle/toggle.directive';
 import { IgxColumnResizingService } from '../resizing/resizing.service';
+import { IgxGridExcelStyleFilteringComponent } from '../filtering/excel-style/grid.excel-style-filtering.component';
 
 let NEXT_ID = 0;
 
@@ -395,7 +396,7 @@ export class IgxHierarchicalGridComponent extends IgxHierarchicalGridBaseDirecti
     }
 
     /** @hidden @internal */
-    public get excelStyleFilteringComponent() {
+    public get excelStyleFilteringComponent() : IgxGridExcelStyleFilteringComponent {
         return this.parentIsland ?
             this.parentIsland.excelStyleFilteringComponents.first :
             super.excelStyleFilteringComponent;