chore(demos): export sample type error and cleanup, update import

Author: damyanpetev

src/app/grid-export/grid-export.sample.ts

@@ -1,12 +1,10 @@
 import { Component, ViewChild } from '@angular/core';
 import {
-    IgxColumnComponent,
+    ColumnType,
     IgxNumberSummaryOperand,
     IgxSummaryResult,
-    IgxExcelExporterService,
     IGridToolbarExportEventArgs,
     IgxExporterOptionsBase,
-    IgxExcelExporterOptions,
     IColumnExportingEventArgs,
     IRowExportingEventArgs,
     IgxGridComponent,
@@ -91,31 +89,31 @@ export class GridExportComponent {
         this.productId = GRID_DATA.length;
     }
 
-    public toggleSummary(column: IgxColumnComponent) {
+    public toggleSummary(column: ColumnType) {
         column.hasSummary = !column.hasSummary;
         this.grid.summaryService.clearSummaryCache();
         this.tGrid.summaryService.clearSummaryCache();
     }
 
     public configureExport(args: IGridToolbarExportEventArgs) {
         console.log(args);
-        //const options: IgxExporterOptionsBase = args.options;
+        // const options: IgxExporterOptionsBase = args.options;
+
+        // // Change exporter options
 
-        // Change exporter options
-        //
         // options.fileName = `Report_${new Date().toDateString()}`;
         // options.exportSummaries = false;
 
-        // Cancel column exporting
-        //
+        // // Cancel column exporting
+
         // args.exporter.columnExporting.subscribe((colExportingArgs: IColumnExportingEventArgs) => {
         //     if (colExportingArgs.columnIndex === 1) {
         //         colExportingArgs.cancel = true;
         //     }
         // });
 
-        // Cancel row exporting
-        //
+        // // Cancel row exporting
+
         // args.exporter.rowExporting.subscribe((rowExportingArgs: IRowExportingEventArgs) => {
         //     if (rowExportingArgs.rowIndex === 1) {
         //         rowExportingArgs.cancel = true;

src/app/grid-filter-template/grid-filter-template.sample.ts

@@ -5,10 +5,9 @@ import {
     IgxNumberFilteringOperand,
     IgxDateFilteringOperand,
     IgxStringFilteringOperand,
-    // ColumnType,
+    ColumnType,
     GridSelectionMode
 } from 'igniteui-angular';
-import { ColumnType } from 'projects/igniteui-angular/src/lib/grids/common/grid.interface';
 
 @Component({
     providers: [],