fix(excel-exporter): fix tests and use core js pure #6673

Author: onlyexeption

package-lock.json

@@ -57,6 +57,7 @@
     "@types/source-map": "0.5.2",
     "classlist.js": "^1.1.20150312",
     "core-js": "^2.6.11",
+    "core-js-pure": "^3.6.5",
     "hammerjs": "^2.0.8",
     "igniteui-trial-watermark": "^1.0.3",
     "jszip": "^3.4.0",

package.json

@@ -2,7 +2,7 @@ import { Injectable, PLATFORM_ID, Inject } from '@angular/core';
 import { isPlatformBrowser } from '@angular/common';
 import { Observable } from 'rxjs';
 import ResizeObserver from 'resize-observer-polyfill';
-import { setImmediate } from 'core-js';
+import { setImmediate } from 'core-js-pure';
 
 /**
  * @hidden

projects/igniteui-angular/src/lib/core/utils.ts

@@ -219,7 +219,7 @@ export class WorksheetFile implements IExcelFile {
         if (!worksheetData.isTreeGridData) {
             rowData[0] = `<row r="${(i + 1)}"${this.rowHeight}>`;
         } else {
-            const originalData = worksheetData.data[i].originalRowData;
+            const originalData = worksheetData.data[i - 1].originalRowData;
             const sCollapsed = (!originalData.expanded) ? '' : (originalData.expanded === true) ? '' : ` collapsed="1"`;
             const sHidden = (originalData.parent && this.hasCollapsedParent(originalData)) ? ` hidden="1"` : '';
             const rowOutlineLevel = originalData.level ? originalData.level : 0;