fix(tree): added missing import and removed extra raf call

Author: tishko0

projects/igniteui-angular/src/lib/tree/tree.component.ts

@@ -29,7 +29,7 @@ import { IgxTreeNodeComponent } from './tree-node/tree-node.component';
 import { IgxTreeSelectionService } from './tree-selection.service';
 import { IgxTreeService } from './tree.service';
 import { growVerIn, growVerOut } from 'igniteui-angular/animations';
-import { resizeObservable } from '../core/utils';
+import { PlatformUtil, resizeObservable } from '../core/utils';
 
 /**
  * @hidden @internal
@@ -327,6 +327,7 @@ export class IgxTreeComponent implements IgxTree, OnInit, AfterViewInit, OnDestr
         private selectionService: IgxTreeSelectionService,
         private treeService: IgxTreeService,
         private element: ElementRef<HTMLElement>,
+        private platform: PlatformUtil,
     ) {
         this.selectionService.register(this);
         this.treeService.register(this);
@@ -501,14 +502,15 @@ export class IgxTreeComponent implements IgxTree, OnInit, AfterViewInit, OnDestr
     private subToChanges() {
         this.unsubChildren$.next();
         const toBeSelected = [...this.forceSelect];
-        requestAnimationFrame(() => {
-            this.selectionService.selectNodesWithNoEvent(toBeSelected);
-        });
+
         if(this.platform.isBrowser) {
             requestAnimationFrame(() => {
                 this.selectionService.selectNodesWithNoEvent(toBeSelected);
             });
+        } else {
+            this.selectionService.selectNodesWithNoEvent(toBeSelected);
         }
+
         this.forceSelect = [];
         this.nodes.forEach(node => {
             node.expandedChange.pipe(takeUntil(this.unsubChildren$)).subscribe(nodeState => {