diff --git a/npm/ng-packs/packages/core/src/lib/directives/permission.directive.ts b/npm/ng-packs/packages/core/src/lib/directives/permission.directive.ts
index a103b11a46..e06c6d404c 100644
--- a/npm/ng-packs/packages/core/src/lib/directives/permission.directive.ts
+++ b/npm/ng-packs/packages/core/src/lib/directives/permission.directive.ts
@@ -23,7 +23,7 @@ export class PermissionDirective implements OnDestroy, OnChanges, AfterViewInit
 
   subscription!: Subscription;
 
-  cdrSubject = new ReplaySubject();
+  cdrSubject = new ReplaySubject<void>();
 
   rendered = false;
 
diff --git a/npm/ng-packs/packages/core/src/lib/services/config-state.service.ts b/npm/ng-packs/packages/core/src/lib/services/config-state.service.ts
index 552b96ed05..98a1635df4 100644
--- a/npm/ng-packs/packages/core/src/lib/services/config-state.service.ts
+++ b/npm/ng-packs/packages/core/src/lib/services/config-state.service.ts
@@ -2,7 +2,10 @@ import { Injectable } from '@angular/core';
 import { Observable, Subject } from 'rxjs';
 import { map, switchMap, take } from 'rxjs/operators';
 import { AbpApplicationConfigurationService } from '../proxy/volo/abp/asp-net-core/mvc/application-configurations/abp-application-configuration.service';
-import { ApplicationConfigurationDto, ApplicationGlobalFeatureConfigurationDto } from '../proxy/volo/abp/asp-net-core/mvc/application-configurations/models';
+import {
+  ApplicationConfigurationDto,
+  ApplicationGlobalFeatureConfigurationDto,
+} from '../proxy/volo/abp/asp-net-core/mvc/application-configurations/models';
 import { InternalStore } from '../utils/internal-store-utils';
 
 @Injectable({
@@ -15,7 +18,7 @@ export class ConfigStateService {
     return this.store.sliceUpdate;
   }
 
-  private updateSubject = new Subject();
+  private updateSubject = new Subject<void>();
 
   constructor(private abpConfigService: AbpApplicationConfigurationService) {
     this.initUpdateStream();
@@ -147,8 +150,11 @@ export class ConfigStateService {
     return this.store.sliceState(state => state.globalFeatures);
   }
 
-  private isGlobalFeatureEnabled(key: string, globalFeatures: ApplicationGlobalFeatureConfigurationDto) {
-    const features = globalFeatures.enabledFeatures || []
+  private isGlobalFeatureEnabled(
+    key: string,
+    globalFeatures: ApplicationGlobalFeatureConfigurationDto,
+  ) {
+    const features = globalFeatures.enabledFeatures || [];
     return features.some(f => key === f);
   }
 
@@ -159,9 +165,6 @@ export class ConfigStateService {
   getGlobalFeatureIsEnabled$(key: string) {
     return this.store.sliceState(state => this.isGlobalFeatureEnabled(key, state.globalFeatures));
   }
-
-
-
 }
 
 function splitKeys(keys: string[] | string): string[] {
diff --git a/npm/ng-packs/packages/core/src/lib/services/http-wait.service.ts b/npm/ng-packs/packages/core/src/lib/services/http-wait.service.ts
index 7292490a4b..792c67ed70 100644
--- a/npm/ng-packs/packages/core/src/lib/services/http-wait.service.ts
+++ b/npm/ng-packs/packages/core/src/lib/services/http-wait.service.ts
@@ -24,7 +24,7 @@ export class HttpWaitService {
   });
 
   private delay: number;
-  private destroy$ = new Subject();
+  private destroy$ = new Subject<void>();
 
   constructor(injector: Injector) {
     this.delay = injector.get(LOADER_DELAY, 500);
diff --git a/npm/ng-packs/packages/core/src/lib/services/list.service.ts b/npm/ng-packs/packages/core/src/lib/services/list.service.ts
index e6de814b77..3025b91682 100644
--- a/npm/ng-packs/packages/core/src/lib/services/list.service.ts
+++ b/npm/ng-packs/packages/core/src/lib/services/list.service.ts
@@ -80,7 +80,7 @@ export class ListService<QueryParamsType = ABP.PageQueryParams | any> implements
 
   private _isLoading$ = new BehaviorSubject(false);
 
-  private destroy$ = new Subject();
+  private destroy$ = new Subject<void>();
 
   private delay: MonoTypeOperatorFunction<QueryParamsType>;
 
diff --git a/npm/ng-packs/packages/core/src/lib/services/router-wait.service.ts b/npm/ng-packs/packages/core/src/lib/services/router-wait.service.ts
index e53ca3a1b1..96e66a00e3 100644
--- a/npm/ng-packs/packages/core/src/lib/services/router-wait.service.ts
+++ b/npm/ng-packs/packages/core/src/lib/services/router-wait.service.ts
@@ -15,7 +15,7 @@ export interface RouterWaitState {
 })
 export class RouterWaitService {
   private store = new InternalStore<RouterWaitState>({ loading: false });
-  private destroy$ = new Subject();
+  private destroy$ = new Subject<void>();
   private delay: number;
   constructor(private routerEvents: RouterEvents, injector: Injector) {
     this.delay = injector.get(LOADER_DELAY, 500);
diff --git a/npm/ng-packs/packages/core/src/lib/tests/api.interceptor.spec.ts b/npm/ng-packs/packages/core/src/lib/tests/api.interceptor.spec.ts
index f731e4e7e5..7715dd69db 100644
--- a/npm/ng-packs/packages/core/src/lib/tests/api.interceptor.spec.ts
+++ b/npm/ng-packs/packages/core/src/lib/tests/api.interceptor.spec.ts
@@ -36,7 +36,7 @@ describe('ApiInterceptor', () => {
     sessionState.getTenant.andReturn({ id: 'Volosoft', name: 'Volosoft' });
 
     const request = new HttpRequest('GET', 'https://abp.io');
-    const handleRes$ = new Subject();
+    const handleRes$ = new Subject<void>();
 
     const handler = {
       handle: (req: HttpRequest<any>) => {
@@ -59,7 +59,7 @@ describe('ApiInterceptor', () => {
     const spyDeleteRequest = jest.spyOn(httpWaitService, 'deleteRequest');
 
     const request = new HttpRequest('GET', 'https://abp.io');
-    const handleRes$ = new Subject();
+    const handleRes$ = new Subject<void>();
 
     const handler = {
       handle: (req: HttpRequest<any>) => {
diff --git a/npm/ng-packs/packages/core/src/lib/tests/routes.service.spec.ts b/npm/ng-packs/packages/core/src/lib/tests/routes.service.spec.ts
index d8f482f9d9..a9cea565f6 100644
--- a/npm/ng-packs/packages/core/src/lib/tests/routes.service.spec.ts
+++ b/npm/ng-packs/packages/core/src/lib/tests/routes.service.spec.ts
@@ -4,7 +4,7 @@ import { RoutesService } from '../services';
 import { DummyInjector } from './utils/common.utils';
 import { mockPermissionService } from './utils/permission-service.spec.utils';
 
-const updateStream$ = new Subject();
+const updateStream$ = new Subject<void>();
 
 export const mockRoutesService = (injectorPayload = {} as { [key: string]: any }) => {
   const injector = new DummyInjector({
diff --git a/npm/ng-packs/packages/core/src/lib/validators/url.validator.ts b/npm/ng-packs/packages/core/src/lib/validators/url.validator.ts
index da941aee6f..db4355eb02 100644
--- a/npm/ng-packs/packages/core/src/lib/validators/url.validator.ts
+++ b/npm/ng-packs/packages/core/src/lib/validators/url.validator.ts
@@ -1,5 +1,5 @@
 import { AbstractControl, ValidatorFn } from '@angular/forms';
-import { isNullOrUndefined } from '../utils';
+import { isNullOrEmpty } from '../utils';
 
 export interface UrlError {
   url: true;
@@ -7,11 +7,11 @@ export interface UrlError {
 
 export function validateUrl(): ValidatorFn {
   return (control: AbstractControl): UrlError | null => {
-    if (isNullOrUndefined(control.value)) return null;
+    if (isNullOrEmpty(control.value)) return null;
 
     return isValidUrl(control.value) ? null : { url: true };
   };
-}  
+}
 
 function isValidUrl(value: string): boolean {
   if (/^http(s)?:\/\/[^/]/.test(value) || /^ftp:\/\/[^/]/.test(value)) {
diff --git a/npm/ng-packs/packages/theme-shared/src/lib/services/confirmation.service.ts b/npm/ng-packs/packages/theme-shared/src/lib/services/confirmation.service.ts
index 02840743da..f93e850aaf 100644
--- a/npm/ng-packs/packages/theme-shared/src/lib/services/confirmation.service.ts
+++ b/npm/ng-packs/packages/theme-shared/src/lib/services/confirmation.service.ts
@@ -13,7 +13,7 @@ export class ConfirmationService {
   private containerComponentRef!: ComponentRef<ConfirmationComponent>;
 
   clear = (status: Confirmation.Status = Confirmation.Status.dismiss) => {
-    this.confirmation$.next();
+    this.confirmation$.next(null);
     this.status$.next(status);
   };
 
diff --git a/npm/ng-packs/packages/theme-shared/src/lib/tests/modal.component.spec.ts b/npm/ng-packs/packages/theme-shared/src/lib/tests/modal.component.spec.ts
index e1f15db581..a875eb27c7 100644
--- a/npm/ng-packs/packages/theme-shared/src/lib/tests/modal.component.spec.ts
+++ b/npm/ng-packs/packages/theme-shared/src/lib/tests/modal.component.spec.ts
@@ -178,7 +178,7 @@ describe('ModalComponent', () => {
       .pipe(
         take(2),
         delay(0),
-        reduce<Event[]>((acc, v) => acc.concat(v), []),
+        reduce<Event[]>((acc, v) => acc.concat(v)),
       )
       .subscribe(([event1, event2]) => {
         expect(event1.returnValue).toBe(false);