Strict done!!

overlord/src/app/balance-sheet/balance-sheet-item.ts

@@ -4,4 +4,9 @@ export class BalanceSheetItem {
   amount?: number;
   subAmount?: number;
   order: number;
+
+  public constructor(init?: Partial<BalanceSheetItem>) {
+    this.order = 0;
+    Object.assign(this, init);
+  }
 }

overlord/src/app/balance-sheet/balance-sheet.component.ts

@@ -16,9 +16,9 @@ import { BalanceSheetDataSource } from './balance-sheet-datasource';
 export class BalanceSheetComponent implements OnInit {
   @ViewChild(MatPaginator, { static: true }) paginator?: MatPaginator;
   @ViewChild(MatSort, { static: true }) sort?: MatSort;
-  dataSource: BalanceSheetDataSource;
+  info: BalanceSheet = new BalanceSheet();
+  dataSource: BalanceSheetDataSource = new BalanceSheetDataSource(this.info.body);
   form: FormGroup;
-  info: BalanceSheet;
   /** Columns displayed in the table. Columns IDs can be added, removed, or reordered. */
   displayedColumns = ['group', 'name', 'subAmount', 'total'];
 
@@ -37,7 +37,7 @@ export class BalanceSheetComponent implements OnInit {
         date: moment(this.info.date, 'DD-MMM-YYYY').toDate(),
       });
     });
-    this.dataSource = new BalanceSheetDataSource(this.paginator, this.sort, this.info.body);
+    this.dataSource = new BalanceSheetDataSource(this.info.body, this.paginator, this.sort);
   }
 
   show() {

overlord/src/app/balance-sheet/balance-sheet.service.ts

@@ -16,7 +16,7 @@ const serviceName = 'BalanceSheetService';
 export class BalanceSheetService {
   constructor(private http: HttpClient, private log: ErrorLoggerService) {}
 
-  list(date: string): Observable<BalanceSheet> {
+  list(date: string | null): Observable<BalanceSheet> {
     const listUrl = date === null ? url : `${url}/${date}`;
     return <Observable<BalanceSheet>>(
       this.http

overlord/src/app/balance-sheet/balance-sheet.ts

@@ -4,4 +4,10 @@ export class BalanceSheet {
   date: string;
   body: BalanceSheetItem[];
   footer?: BalanceSheetItem;
+
+  public constructor(init?: Partial<BalanceSheet>) {
+    this.date = '';
+    this.body = [];
+    Object.assign(this, init);
+  }
 }