update tslint -> eslint

src/app/app.component.spec.ts

@@ -3,20 +3,17 @@ import {RouterTestingModule} from '@angular/router/testing';
 import {AppComponent} from './app.component';
 
 describe('AppComponent', () => {
-  beforeEach(waitForAsync(() => {
-    TestBed.configureTestingModule({
-      imports: [
-        RouterTestingModule
-      ],
-      declarations: [
-        AppComponent
-      ],
-    }).compileComponents();
-  }));
+  beforeEach(
+    waitForAsync(() => {
+      void TestBed.configureTestingModule({
+        imports: [RouterTestingModule],
+        declarations: [AppComponent],
+      }).compileComponents();
+    })
+  );
 
   it('should create the app', () => {
     const fixture = TestBed.createComponent(AppComponent);
-    const app = fixture.debugElement.componentInstance;
-    expect(app).toBeTruthy();
+    void expect(fixture.debugElement.componentInstance).toBeTruthy();
   });
 });