Prettied, Linted and updated angular.json according to the latest schematic of Angular CLI.

Now all that is needed is to make it ready for strict compiling.
Removed eslint-plugin-prettier as it is not recommended and causes errors for both eslint and prettier

Bumped to v8.0.0

overlord/src/app/issue/issue-dialog.component.ts

@@ -1,12 +1,13 @@
 import { Component, Inject, OnInit } from '@angular/core';
+import { FormBuilder, FormGroup } from '@angular/forms';
 import { MatAutocompleteSelectedEvent } from '@angular/material/autocomplete';
 import { MAT_DIALOG_DATA, MatDialogRef } from '@angular/material/dialog';
-import { FormBuilder, FormGroup } from '@angular/forms';
-import { debounceTime, distinctUntilChanged, map, startWith, switchMap } from 'rxjs/operators';
-import { Observable, of as observableOf } from 'rxjs';
-import { MathService } from '../shared/math.service';
-import { Batch } from '../core/voucher';
+import { Observable } from 'rxjs';
+import { debounceTime, distinctUntilChanged, startWith, switchMap } from 'rxjs/operators';
+
+import { Batch } from '../core/batch';
 import { BatchService } from '../core/batch.service';
+import { MathService } from '../shared/math.service';
 
 @Component({
   selector: 'app-issue-dialog',
@@ -47,17 +48,14 @@ export class IssueDialogComponent implements OnInit {
   listenToBatchAutocompleteChange(): void {
     const control = this.form.get('batch');
     this.batches = control.valueChanges.pipe(
-      startWith(null),
-      map((x) => (x !== null && x.length >= 1 ? x : null)),
+      startWith(''),
       debounceTime(150),
       distinctUntilChanged(),
-      switchMap((x) =>
-        x === null ? observableOf([]) : this.batchSer.autocomplete(this.data.date, x),
-      ),
+      switchMap((x) => this.batchSer.autocomplete(this.data.date, x)),
     );
   }
 
-  displayBatchName(batch?: Batch): string | undefined {
+  displayFn(batch?: Batch): string | undefined {
     return batch ? batch.name : undefined;
   }