Updated to angular 11

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

bookie/src/app/sections/section-list/section-list.component.ts

@@ -11,15 +11,16 @@ import { SectionListDataSource } from './section-list-datasource';
   styleUrls: ['./section-list.component.css'],
 })
 export class SectionListComponent implements OnInit {
-  dataSource: SectionListDataSource;
-  list: Section[];
+  list: Section[] = [];
+  dataSource: SectionListDataSource = new SectionListDataSource(this.list);
   /** Columns displayed in the table. Columns IDs can be added, removed, or reordered. */
   displayedColumns = ['name'];
 
   constructor(private route: ActivatedRoute) {}
 
   ngOnInit() {
-    this.route.data.subscribe((data: { list: Section[] }) => {
+    this.route.data.subscribe((value) => {
+      const data = value as { list: Section[] };
       this.list = data.list;
     });
     this.dataSource = new SectionListDataSource(this.list);