Updated to angular 11

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

bookie/src/app/printers/printer-detail/printer-detail.component.spec.ts

@@ -1,4 +1,4 @@
-import { async, ComponentFixture, TestBed } from '@angular/core/testing';
+import { ComponentFixture, TestBed, waitForAsync } from '@angular/core/testing';
 
 import { PrinterDetailComponent } from './printer-detail.component';
 
@@ -6,11 +6,13 @@ describe('PrinterDetailComponent', () => {
   let component: PrinterDetailComponent;
   let fixture: ComponentFixture<PrinterDetailComponent>;
 
-  beforeEach(async(() => {
-    TestBed.configureTestingModule({
-      declarations: [PrinterDetailComponent],
-    }).compileComponents();
-  }));
+  beforeEach(
+    waitForAsync(() => {
+      TestBed.configureTestingModule({
+        declarations: [PrinterDetailComponent],
+      }).compileComponents();
+    }),
+  );
 
   beforeEach(() => {
     fixture = TestBed.createComponent(PrinterDetailComponent);

bookie/src/app/printers/printer-detail/printer-detail.component.ts

@@ -14,9 +14,9 @@ import { PrinterService } from '../printer.service';
   styleUrls: ['./printer-detail.component.css'],
 })
 export class PrinterDetailComponent implements OnInit, AfterViewInit {
-  @ViewChild('nameElement', { static: true }) nameElement: ElementRef;
+  @ViewChild('nameElement', { static: true }) nameElement?: ElementRef;
   form: FormGroup;
-  item: Printer;
+  item: Printer = new Printer();
 
   constructor(
     private route: ActivatedRoute,
@@ -26,10 +26,7 @@ export class PrinterDetailComponent implements OnInit, AfterViewInit {
     private toaster: ToasterService,
     private ser: PrinterService,
   ) {
-    this.createForm();
-  }
-
-  createForm() {
+    // Create form
     this.form = this.fb.group({
       name: '',
       address: '',
@@ -38,7 +35,8 @@ export class PrinterDetailComponent implements OnInit, AfterViewInit {
   }
 
   ngOnInit() {
-    this.route.data.subscribe((data: { item: Printer }) => {
+    this.route.data.subscribe((value) => {
+      const data = value as { item: Printer };
       this.showItem(data.item);
     });
   }
@@ -54,7 +52,9 @@ export class PrinterDetailComponent implements OnInit, AfterViewInit {
 
   ngAfterViewInit() {
     setTimeout(() => {
-      this.nameElement.nativeElement.focus();
+      if (this.nameElement !== undefined) {
+        this.nameElement.nativeElement.focus();
+      }
     }, 0);
   }
 
@@ -71,7 +71,7 @@ export class PrinterDetailComponent implements OnInit, AfterViewInit {
   }
 
   delete() {
-    this.ser.delete(this.item.id).subscribe(
+    this.ser.delete(this.item.id as string).subscribe(
       () => {
         this.toaster.show('Success', '');
         this.router.navigateByUrl('/printers');

bookie/src/app/printers/printer-list/printer-list.component.ts

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

bookie/src/app/printers/printer.service.ts

@@ -18,7 +18,7 @@ const serviceName = 'PrinterService';
 export class PrinterService {
   constructor(private http: HttpClient, private log: ErrorLoggerService) {}
 
-  get(id: string): Observable<Printer> {
+  get(id: string | null): Observable<Printer> {
     const getUrl: string = id === null ? url : `${url}/${id}`;
     return <Observable<Printer>>(
       this.http