fix(Export): Use IIFE instead of changing base method signature.

Author: gedinakova

projects/igniteui-angular/grids/core/src/services/excel/excel-exporter-grid.spec.ts

@@ -90,13 +90,14 @@ describe('Excel Exporter', () => {
         }).compileComponents();
     }));
 
-    beforeEach(waitForAsync(() => {
+    beforeEach(async () => {
         exporter = new IgxExcelExporterService();
         actualData = new FileContentData();
+        await import('fflate');
 
         // Spy the saveBlobToFile method so the files are not really created
         spyOn(ExportUtilities as any, 'saveBlobToFile');
-    }));
+    });
 
     afterEach(waitForAsync(() => {
         exporter.columnExporting.unsubscribe();
@@ -530,9 +531,6 @@ describe('Excel Exporter', () => {
             const sortField = grid.sortingExpressions[0].fieldName;
             fix.detectChanges();
 
-            await getExportedData(grid, options);
-            fix.detectChanges();
-
             await getExportedData(grid, options);
             const sortFieldAfterExport = grid.sortingExpressions[0].fieldName;
             expect(sortField).toBe(sortFieldAfterExport);

projects/igniteui-angular/grids/core/src/services/excel/excel-exporter.spec.ts

@@ -12,11 +12,11 @@ describe('Excel Exporter', () => {
     let options: IgxExcelExporterOptions;
     let actualData: FileContentData;
 
-    beforeEach(() => {
+    beforeEach(async () => {
         exporter = new IgxExcelExporterService();
         actualData = new FileContentData();
         options = new IgxExcelExporterOptions('ExcelExport');
-
+        await import('fflate');
         // Spy the saveBlobToFile method so the files are not really created
         spyOn(ExportUtilities, 'saveBlobToFile');
     });

projects/igniteui-angular/grids/core/src/services/excel/excel-exporter.ts

@@ -71,7 +71,7 @@ export class IgxExcelExporterService extends IgxBaseExporter {
         }
     }
 
-    protected async exportDataImplementation(data: IExportRecord[], options: IgxExcelExporterOptions, done: () => void) {
+    protected exportDataImplementation(data: IExportRecord[], options: IgxExcelExporterOptions, done: () => void): void {
         const firstDataElement = data[0];
         const isHierarchicalGrid = firstDataElement?.type === ExportRecordType.HierarchicalGridRecord;
         const isPivotGrid = firstDataElement?.type === ExportRecordType.PivotGridRecord;
@@ -133,29 +133,31 @@ export class IgxExcelExporterService extends IgxBaseExporter {
 
         const rootFolder = ExcelElementsFactory.getExcelFolder(ExcelFolderTypes.RootExcelFolder);
         const fileData = {};
-        try {
-            await IgxExcelExporterService.populateZipFileConfig(fileData, rootFolder, worksheetData);
-
-            // Dynamically import fflate to reduce initial bundle size
-            const { zip } = await import('fflate');
-
-            await new Promise<void>((resolve, reject) => {
-                zip(fileData, (error, result) => {
-                    if (error) {
-                        reject(error);
-                        return;
-                    }
-                    this.saveFile(result, options.fileName);
-                    this.exportEnded.emit({ xlsx: fileData });
-                    resolve();
+        (async () => {
+            try {
+                await IgxExcelExporterService.populateZipFileConfig(fileData, rootFolder, worksheetData);
+
+                // Dynamically import fflate to reduce initial bundle size
+                const { zip } = await import('fflate');
+
+                await new Promise<void>((resolve, reject) => {
+                    zip(fileData, (error, result) => {
+                        if (error) {
+                            reject(error);
+                            return;
+                        }
+                        this.saveFile(result, options.fileName);
+                        this.exportEnded.emit({ xlsx: fileData });
+                        resolve();
+                    });
                 });
-            });
 
-            done();
-        } catch (error) {
-            console.error('Excel export failed:', error);
-            done();
-        }
+                done();
+            } catch (error) {
+                console.error('Excel export failed:', error);
+                done();
+            }
+        })();
     }
 
     private saveFile(data: Uint8Array, fileName: string): void {