Moved from tslint to eslint as tslint was depreciated.

Added prettier and also prettied all the typescript files using prettier

ESLint is using the AirBnB rules which are the most strict to lint the files.

overlord/src/app/closing-stock/closing-stock.service.ts

@@ -1,31 +1,29 @@
-import {Injectable} from '@angular/core';
-import {catchError} from 'rxjs/operators';
-import {Observable} from 'rxjs/internal/Observable';
-import {HttpClient, HttpHeaders} from '@angular/common/http';
-import {ClosingStock} from './closing-stock';
-import {ErrorLoggerService} from '../core/error-logger.service';
+import { Injectable } from '@angular/core';
+import { catchError } from 'rxjs/operators';
+import { Observable } from 'rxjs/internal/Observable';
+import { HttpClient, HttpHeaders } from '@angular/common/http';
+import { ClosingStock } from './closing-stock';
+import { ErrorLoggerService } from '../core/error-logger.service';
 
 const httpOptions = {
-  headers: new HttpHeaders({'Content-Type': 'application/json'})
+  headers: new HttpHeaders({ 'Content-Type': 'application/json' }),
 };
 
 const url = '/api/closing-stock';
 const serviceName = 'ClosingStockService';
 
 @Injectable({
-  providedIn: 'root'
+  providedIn: 'root',
 })
 export class ClosingStockService {
-
-  constructor(private http: HttpClient, private log: ErrorLoggerService) {
-  }
+  constructor(private http: HttpClient, private log: ErrorLoggerService) {}
 
   list(date: string): Observable<ClosingStock> {
-    const listUrl = (date === null) ? url : `${url}/${date}`;
-    return <Observable<ClosingStock>>this.http.get<ClosingStock>(listUrl)
-      .pipe(
-        catchError(this.log.handleError(serviceName, 'list'))
-      );
+    const listUrl = date === null ? url : `${url}/${date}`;
+    return <Observable<ClosingStock>>(
+      this.http
+        .get<ClosingStock>(listUrl)
+        .pipe(catchError(this.log.handleError(serviceName, 'list')))
+    );
   }
-
 }