Updated to angular 11

Now compiling with strict mode in typescript
Need to error checking now

bookie/src/app/beer-sale-report/beer-sale-report.component.ts

@@ -5,6 +5,7 @@ import * as moment from 'moment';
 
 import { ToCsvService } from '../shared/to-csv.service';
 
+import { BeerSaleExportHeaderInterface } from './beer-sale-export-header-interface';
 import { BeerSaleReport } from './beer-sale-report';
 import { BeerSaleReportDataSource } from './beer-sale-report-datasource';
 
@@ -14,9 +15,9 @@ import { BeerSaleReportDataSource } from './beer-sale-report-datasource';
   styleUrls: ['./beer-sale-report.component.css'],
 })
 export class BeerSaleReportComponent implements OnInit {
-  dataSource: BeerSaleReportDataSource;
+  info: BeerSaleReport = new BeerSaleReport();
+  dataSource: BeerSaleReportDataSource = new BeerSaleReportDataSource(this.info.data);
   form: FormGroup;
-  info: BeerSaleReport;
 
   /** Columns displayed in the table. Columns IDs can be added, removed, or reordered. */
   displayedColumns: string[] = ['date'];
@@ -27,11 +28,16 @@ export class BeerSaleReportComponent implements OnInit {
     private fb: FormBuilder,
     private toCsv: ToCsvService,
   ) {
-    this.createForm();
+    // Create form
+    this.form = this.fb.group({
+      startDate: '',
+      finishDate: '',
+    });
   }
 
   ngOnInit() {
-    this.route.data.subscribe((data: { info: BeerSaleReport }) => {
+    this.route.data.subscribe((value) => {
+      const data = value as { info: BeerSaleReport };
       this.info = data.info;
       this.displayedColumns = ['date'].concat(this.info.headers);
       this.form.setValue({
@@ -52,32 +58,21 @@ export class BeerSaleReportComponent implements OnInit {
     });
   }
 
-  createForm() {
-    this.form = this.fb.group({
-      startDate: '',
-      finishDate: '',
-    });
-  }
-
   getInfo(): BeerSaleReport {
     const formModel = this.form.value;
 
-    return {
+    return new BeerSaleReport({
       startDate: moment(formModel.startDate).format('DD-MMM-YYYY'),
       finishDate: moment(formModel.finishDate).format('DD-MMM-YYYY'),
-    };
+    });
   }
 
   exportCsv() {
-    const headers = this.info.headers.reduce(
-      (a, c) => {
-        a[c] = c;
-        return a;
-      },
-      {
-        Date: 'date',
-      },
-    );
+    const init: BeerSaleExportHeaderInterface = { Date: 'date' };
+    const headers = this.info.headers.reduce((a, c) => {
+      a[c] = c;
+      return a;
+    }, init);
     const csvData = new Blob([this.toCsv.toCsv(headers, this.info.data)], {
       type: 'text/csv;charset=utf-8;',
     });