diff --git a/src/Squidex/app/features/assets/pages/assets-page.component.ts b/src/Squidex/app/features/assets/pages/assets-page.component.ts
index c0d266855..011381093 100644
--- a/src/Squidex/app/features/assets/pages/assets-page.component.ts
+++ b/src/Squidex/app/features/assets/pages/assets-page.component.ts
@@ -86,7 +86,7 @@ export class AssetsPageComponent extends AppComponentBase implements OnDestroy,
     public onAssetDeleting(asset: AssetDto) {
         this.appNameOnce()
             .switchMap(app => this.assetsService.deleteAsset(app, asset.id, asset.version))
-            .subscribe(dtos => {
+            .subscribe(dto => {
                 this.assetsItems = this.assetsItems.filter(x => x.id !== asset.id);
                 this.assetsPager = this.assetsPager.decrementCount();
             }, error => {
diff --git a/src/Squidex/app/features/content/pages/content/content-page.component.ts b/src/Squidex/app/features/content/pages/content/content-page.component.ts
index b24ebe0f4..cbaf60646 100644
--- a/src/Squidex/app/features/content/pages/content/content-page.component.ts
+++ b/src/Squidex/app/features/content/pages/content/content-page.component.ts
@@ -43,7 +43,7 @@ import {
 })
 export class ContentPageComponent extends AppComponentBase implements CanComponentDeactivate, OnDestroy, OnInit {
     private contentDeletedSubscription: Subscription;
-    private version: Version = new Version('');
+    private version = new Version('');
     private cancelPromise: Subject<boolean> | null = null;
     private content: ContentDto;
 
diff --git a/src/Squidex/app/features/schemas/pages/schema/field.component.ts b/src/Squidex/app/features/schemas/pages/schema/field.component.ts
index 58e18c3d3..3fb298628 100644
--- a/src/Squidex/app/features/schemas/pages/schema/field.component.ts
+++ b/src/Squidex/app/features/schemas/pages/schema/field.component.ts
@@ -6,7 +6,7 @@
  */
 
 import { Component, EventEmitter, Input, OnInit, Output } from '@angular/core';
-import { FormBuilder, FormGroup, Validators } from '@angular/forms';
+import { FormBuilder, Validators } from '@angular/forms';
 
 import {
     createProperties,
@@ -59,7 +59,7 @@ export class FieldComponent implements OnInit {
     }
 
     public editFormSubmitted = false;
-    public editForm: FormGroup =
+    public editForm =
         this.formBuilder.group({
             label: ['',
                 [
diff --git a/src/Squidex/app/features/schemas/pages/schema/schema-edit-form.component.ts b/src/Squidex/app/features/schemas/pages/schema/schema-edit-form.component.ts
index d44fe3e53..930af2cbc 100644
--- a/src/Squidex/app/features/schemas/pages/schema/schema-edit-form.component.ts
+++ b/src/Squidex/app/features/schemas/pages/schema/schema-edit-form.component.ts
@@ -6,7 +6,7 @@
  */
 
 import { Component, EventEmitter, Input, OnInit, Output } from '@angular/core';
-import { FormBuilder, FormGroup, Validators } from '@angular/forms';
+import { FormBuilder, Validators } from '@angular/forms';
 
 import {
     ComponentBase,
@@ -41,7 +41,7 @@ export class SchemaEditFormComponent extends ComponentBase implements OnInit {
     public appName: string;
 
     public editFormSubmitted = false;
-    public editForm: FormGroup =
+    public editForm =
         this.formBuilder.group({
             label: ['',
                 [
diff --git a/src/Squidex/app/features/schemas/pages/schema/schema-page.component.ts b/src/Squidex/app/features/schemas/pages/schema/schema-page.component.ts
index 63ee20367..ead1c368b 100644
--- a/src/Squidex/app/features/schemas/pages/schema/schema-page.component.ts
+++ b/src/Squidex/app/features/schemas/pages/schema/schema-page.component.ts
@@ -6,7 +6,7 @@
  */
 
 import { Component, OnInit } from '@angular/core';
-import { FormBuilder, FormGroup, Validators } from '@angular/forms';
+import { FormBuilder, Validators } from '@angular/forms';
 import { ActivatedRoute, Router } from '@angular/router';
 
 import {
@@ -55,7 +55,7 @@ export class SchemaPageComponent extends AppComponentBase implements OnInit {
     public editSchemaDialog = new ModalView();
 
     public addFieldFormSubmitted = false;
-    public addFieldForm: FormGroup =
+    public addFieldForm =
         this.formBuilder.group({
             type: ['String',
                 [
diff --git a/src/Squidex/app/features/schemas/pages/schemas/schema-form.component.ts b/src/Squidex/app/features/schemas/pages/schemas/schema-form.component.ts
index 0a52c03e9..d4fffad12 100644
--- a/src/Squidex/app/features/schemas/pages/schemas/schema-form.component.ts
+++ b/src/Squidex/app/features/schemas/pages/schemas/schema-form.component.ts
@@ -6,7 +6,7 @@
  */
 
 import { Component, EventEmitter, Input, Output } from '@angular/core';
-import { FormBuilder, FormGroup, Validators } from '@angular/forms';
+import { FormBuilder, Validators } from '@angular/forms';
 
 import {
     ApiUrlConfig,
@@ -42,7 +42,7 @@ export class SchemaFormComponent {
 
     public createFormError = '';
     public createFormSubmitted = false;
-    public createForm: FormGroup =
+    public createForm =
         this.formBuilder.group({
             name: ['',
                 [
diff --git a/src/Squidex/app/features/settings/pages/clients/client.component.ts b/src/Squidex/app/features/settings/pages/clients/client.component.ts
index 6983d9b52..cfcd67113 100644
--- a/src/Squidex/app/features/settings/pages/clients/client.component.ts
+++ b/src/Squidex/app/features/settings/pages/clients/client.component.ts
@@ -6,7 +6,7 @@
  */
 
 import { Component, EventEmitter, Input, Output } from '@angular/core';
-import { FormBuilder, FormGroup, Validators } from '@angular/forms';
+import { FormBuilder, Validators } from '@angular/forms';
 
 import {
     AccessTokenDto,
@@ -49,7 +49,7 @@ export class ClientComponent extends ComponentBase {
     public token: AccessTokenDto;
     public tokenDialog = new ModalView();
 
-    public renameForm: FormGroup =
+    public renameForm =
         this.formBuilder.group({
             name: ['',
                 Validators.required
diff --git a/src/Squidex/app/features/settings/pages/clients/clients-page.component.ts b/src/Squidex/app/features/settings/pages/clients/clients-page.component.ts
index 115a1d6bf..28e1ad952 100644
--- a/src/Squidex/app/features/settings/pages/clients/clients-page.component.ts
+++ b/src/Squidex/app/features/settings/pages/clients/clients-page.component.ts
@@ -6,7 +6,7 @@
  */
 
 import { Component, OnInit } from '@angular/core';
-import { FormBuilder, FormGroup, Validators } from '@angular/forms';
+import { FormBuilder, Validators } from '@angular/forms';
 
 import {
     AppClientDto,
@@ -34,7 +34,7 @@ export class ClientsPageComponent extends AppComponentBase implements OnInit {
     public appClients: ImmutableArray<AppClientDto>;
 
     public addClientFormSubmitted = false;
-    public addClientForm: FormGroup =
+    public addClientForm =
         this.formBuilder.group({
             name: ['',
                 [
diff --git a/src/Squidex/app/features/settings/pages/contributors/contributors-page.component.ts b/src/Squidex/app/features/settings/pages/contributors/contributors-page.component.ts
index 12515f6ee..a763800c2 100644
--- a/src/Squidex/app/features/settings/pages/contributors/contributors-page.component.ts
+++ b/src/Squidex/app/features/settings/pages/contributors/contributors-page.component.ts
@@ -6,7 +6,7 @@
  */
 
 import { Component, OnInit } from '@angular/core';
-import { FormBuilder, FormGroup, Validators } from '@angular/forms';
+import { FormBuilder, Validators } from '@angular/forms';
 import { Observable } from 'rxjs';
 
 import {
@@ -73,7 +73,7 @@ export class ContributorsPageComponent extends AppComponentBase implements OnIni
         return this.addContributorForm.valid && (this.maxContributors <= -1 || this.appContributors.length < this.maxContributors);
     }
 
-    public addContributorForm: FormGroup =
+    public addContributorForm =
         this.formBuilder.group({
             user: [null,
                 [
diff --git a/src/Squidex/app/features/settings/pages/languages/language.component.ts b/src/Squidex/app/features/settings/pages/languages/language.component.ts
index 90d33a4dd..ad96317bf 100644
--- a/src/Squidex/app/features/settings/pages/languages/language.component.ts
+++ b/src/Squidex/app/features/settings/pages/languages/language.component.ts
@@ -6,7 +6,7 @@
  */
 
 import { Component, EventEmitter, Input, OnChanges, OnDestroy, Output, OnInit } from '@angular/core';
-import { FormBuilder, FormGroup, Validators } from '@angular/forms';
+import { FormBuilder, Validators } from '@angular/forms';
 import { Subscription } from 'rxjs';
 
 import {
@@ -46,13 +46,13 @@ export class LanguageComponent implements OnInit, OnChanges, OnDestroy {
     public isMaster = false;
 
     public editFormSubmitted = false;
-    public editForm: FormGroup =
+    public editForm =
         this.formBuilder.group({
             isMaster: [false, []],
             isOptional: [false, []]
         });
 
-    public addLanguageForm: FormGroup =
+    public addLanguageForm =
         this.formBuilder.group({
             language: [null,
                 Validators.required
diff --git a/src/Squidex/app/features/settings/pages/languages/languages-page.component.ts b/src/Squidex/app/features/settings/pages/languages/languages-page.component.ts
index e1a122ae2..c43216dce 100644
--- a/src/Squidex/app/features/settings/pages/languages/languages-page.component.ts
+++ b/src/Squidex/app/features/settings/pages/languages/languages-page.component.ts
@@ -6,7 +6,7 @@
  */
 
 import { Component, OnInit } from '@angular/core';
-import { FormBuilder, FormGroup, Validators } from '@angular/forms';
+import { FormBuilder, Validators } from '@angular/forms';
 
 import {
     AddAppLanguageDto,
@@ -35,7 +35,7 @@ export class LanguagesPageComponent extends AppComponentBase implements OnInit {
     public newLanguages: LanguageDto[] = [];
     public appLanguages = ImmutableArray.empty<AppLanguageDto>();
 
-    public addLanguageForm: FormGroup =
+    public addLanguageForm =
         this.formBuilder.group({
             language: [null,
                 Validators.required
diff --git a/src/Squidex/app/features/webhooks/pages/webhooks-page.component.ts b/src/Squidex/app/features/webhooks/pages/webhooks-page.component.ts
index c3e6ef6bd..9a50bed9b 100644
--- a/src/Squidex/app/features/webhooks/pages/webhooks-page.component.ts
+++ b/src/Squidex/app/features/webhooks/pages/webhooks-page.component.ts
@@ -6,7 +6,7 @@
  */
 
 import { Component, OnInit } from '@angular/core';
-import { FormBuilder, FormGroup, Validators } from '@angular/forms';
+import { FormBuilder, Validators } from '@angular/forms';
 
 import {
     AppComponentBase,
@@ -36,7 +36,7 @@ export class WebhooksPageComponent extends AppComponentBase implements OnInit {
     public schemas: SchemaDto[];
 
     public addWebhookFormSubmitted = false;
-    public addWebhookForm: FormGroup =
+    public addWebhookForm =
         this.formBuilder.group({
             schemaId: ['',
                 [
diff --git a/src/Squidex/app/framework/angular/autocomplete.component.ts b/src/Squidex/app/framework/angular/autocomplete.component.ts
index f4d4dbf32..3742e6fac 100644
--- a/src/Squidex/app/framework/angular/autocomplete.component.ts
+++ b/src/Squidex/app/framework/angular/autocomplete.component.ts
@@ -59,7 +59,7 @@ export class AutocompleteComponent implements ControlValueAccessor, OnDestroy, O
         if (!value) {
             this.resetValue();
         } else {
-            let item = this.items.find(i => i === value);
+            const item = this.items.find(i => i === value);
 
             if (item) {
                 this.queryInput.setValue(value.title || '');
@@ -103,7 +103,7 @@ export class AutocompleteComponent implements ControlValueAccessor, OnDestroy, O
                     }
                 })
                 .filter(query => !!query && !!this.source)
-                .switchMap(query => this.source.find(query)).catch(_ => Observable.of([]))
+                .switchMap(query => this.source.find(query)).catch(error => Observable.of([]))
                 .subscribe(items => {
                     this.reset();
                     this.items = items || [];
@@ -129,6 +129,8 @@ export class AutocompleteComponent implements ControlValueAccessor, OnDestroy, O
                 }
                 break;
         }
+
+        return true;
     }
 
     public blur() {
diff --git a/src/Squidex/app/framework/angular/control-errors.component.ts b/src/Squidex/app/framework/angular/control-errors.component.ts
index a32cbca88..d1f4b0fbf 100644
--- a/src/Squidex/app/framework/angular/control-errors.component.ts
+++ b/src/Squidex/app/framework/angular/control-errors.component.ts
@@ -61,17 +61,17 @@ export class ControlErrorsComponent implements OnChanges {
 
             for (let key in <any>this.control.errors) {
                 if (this.control.errors.hasOwnProperty(key)) {
-                    let message: string = (this.errors ? this.errors[key] : null) || DEFAULT_ERRORS[key];
+                    let message = (this.errors ? this.errors[key] : null) || DEFAULT_ERRORS[key];
 
                     if (!message) {
                         continue;
                     }
 
-                    let properties = this.control.errors[key];
+                    const properties = this.control.errors[key];
 
                     for (let property in properties) {
                         if (properties.hasOwnProperty(property)) {
-                            message = message.replace('{' + property + '}', properties[property]);
+                            message = message.replace(`{${property}}`, properties[property]);
                         }
                     }
 
diff --git a/src/Squidex/app/framework/angular/date-time-editor.component.ts b/src/Squidex/app/framework/angular/date-time-editor.component.ts
index 081c94ee4..8168326f2 100644
--- a/src/Squidex/app/framework/angular/date-time-editor.component.ts
+++ b/src/Squidex/app/framework/angular/date-time-editor.component.ts
@@ -166,7 +166,7 @@ export class DateTimeEditorComponent implements ControlValueAccessor, OnDestroy,
     }
 
     private updateValue() {
-        let result: string | null = null;
+        let result: string | null;
 
         if ((this.dateValue && !this.dateValue.isValid()) || (this.timeValue && !this.timeValue.isValid())) {
             result = 'Invalid DateTime';
diff --git a/src/Squidex/app/framework/angular/dropdown.component.ts b/src/Squidex/app/framework/angular/dropdown.component.ts
index b0cf58322..a4ec504a5 100644
--- a/src/Squidex/app/framework/angular/dropdown.component.ts
+++ b/src/Squidex/app/framework/angular/dropdown.component.ts
@@ -89,6 +89,8 @@ export class DropdownComponent implements AfterContentInit, ControlValueAccessor
                 this.close();
                 return false;
         }
+
+        return true;
     }
 
     public open() {
diff --git a/src/Squidex/app/framework/angular/focus-on-init.directive.spec.ts b/src/Squidex/app/framework/angular/focus-on-init.directive.spec.ts
index 6e0724110..50efd6f96 100644
--- a/src/Squidex/app/framework/angular/focus-on-init.directive.spec.ts
+++ b/src/Squidex/app/framework/angular/focus-on-init.directive.spec.ts
@@ -15,7 +15,7 @@ describe('FocusOnInitDirective', () => {
         const calledElements: any[] = [];
 
         const renderer = {
-            invokeElementMethod: (elem: any, method: any, args: any) => {
+            invokeElementMethod: (elem: any, method: any) => {
                 calledElements.push(elem);
                 calledMethods.push(method);
             }
diff --git a/src/Squidex/app/framework/angular/geolocation-editor.component.ts b/src/Squidex/app/framework/angular/geolocation-editor.component.ts
index 76e803261..00001813a 100644
--- a/src/Squidex/app/framework/angular/geolocation-editor.component.ts
+++ b/src/Squidex/app/framework/angular/geolocation-editor.component.ts
@@ -169,7 +169,7 @@ export class GeolocationEditorComponent implements ControlValueAccessor, AfterVi
                     this.value = { latitude: latlng.lat, longitude: latlng.lng };
                 });
 
-                this.marker.on('dragend', (event: any) => {
+                this.marker.on('dragend', () => {
                     this.updateMarker(false, true);
                 });
 
diff --git a/src/Squidex/app/framework/angular/http-extensions-impl.ts b/src/Squidex/app/framework/angular/http-extensions-impl.ts
index 800138dee..82314edf2 100644
--- a/src/Squidex/app/framework/angular/http-extensions-impl.ts
+++ b/src/Squidex/app/framework/angular/http-extensions-impl.ts
@@ -13,7 +13,7 @@ import { Version } from './../utils/version';
 export class ErrorDto {
     public get displayMessage(): string {
         let result = this.message;
-        let lastChar = '';
+        let lastChar: string;
 
         if (this.details && this.details.length > 0) {
             const detailMessage = this.details[0];
@@ -103,7 +103,7 @@ export function pretifyError(message: string): Observable<any> {
                     result = new ErrorDto(response.status, response.error.message, response.error.details);
                 }
             } catch (e) {
-                result = result;
+                /* Ignore */
             }
         }
 
diff --git a/src/Squidex/app/framework/angular/name.pipe.ts b/src/Squidex/app/framework/angular/name.pipe.ts
index d4a2bbe95..0f06e5b35 100644
--- a/src/Squidex/app/framework/angular/name.pipe.ts
+++ b/src/Squidex/app/framework/angular/name.pipe.ts
@@ -29,12 +29,12 @@ export class DisplayNamePipe implements PipeTransform {
         const parts = s.split('.');
 
         for (let i = 0, n = parts.length; i < n; ++i) {
-            let k = parts[i];
+            const k = parts[i];
 
             if (k in o) {
                 o = o[k];
             } else {
-                return;
+                return undefined;
             }
         }
 
diff --git a/src/Squidex/app/framework/angular/root-view.directive.spec.ts b/src/Squidex/app/framework/angular/root-view.directive.spec.ts
index 1169d1f5b..7ea8d8548 100644
--- a/src/Squidex/app/framework/angular/root-view.directive.spec.ts
+++ b/src/Squidex/app/framework/angular/root-view.directive.spec.ts
@@ -12,7 +12,7 @@ import { RootViewDirective } from './../';
 describe('RootViewDirective', () => {
     it('should call init of service in ctor', () => {
         let viewRef = {};
-        let viewRefPassed = null;
+        let viewRefPassed: any = null;
 
         const service = {
             init: (ref: any) => {
diff --git a/src/Squidex/app/framework/angular/router-utils.ts b/src/Squidex/app/framework/angular/router-utils.ts
index 97034de9e..82fb59638 100644
--- a/src/Squidex/app/framework/angular/router-utils.ts
+++ b/src/Squidex/app/framework/angular/router-utils.ts
@@ -10,7 +10,7 @@ import { ActivatedRoute, ActivatedRouteSnapshot, Data, Params } from '@angular/r
 export function allData(value: ActivatedRouteSnapshot | ActivatedRoute): Data {
     let snapshot: ActivatedRouteSnapshot = value['snapshot'] || value;
 
-    let result: { [key: string]: any } = { };
+    const result: { [key: string]: any } = { };
 
     while (snapshot) {
         for (let key in snapshot.data) {
@@ -27,7 +27,7 @@ export function allData(value: ActivatedRouteSnapshot | ActivatedRoute): Data {
 export function allParams(value: ActivatedRouteSnapshot | ActivatedRoute): Params {
     let snapshot: ActivatedRouteSnapshot = value['snapshot'] || value;
 
-    let result: { [key: string]: any } = { };
+    const result: { [key: string]: any } = { };
 
     while (snapshot) {
         for (let key in snapshot.params) {
diff --git a/src/Squidex/app/framework/angular/slider.component.ts b/src/Squidex/app/framework/angular/slider.component.ts
index a893e0e84..f429e385f 100644
--- a/src/Squidex/app/framework/angular/slider.component.ts
+++ b/src/Squidex/app/framework/angular/slider.component.ts
@@ -95,7 +95,7 @@ export class SliderComponent implements ControlValueAccessor {
             });
 
         this.mouseUpSubscription =
-            this.renderer.listenGlobal('window', 'mouseup', (e: MouseEvent) => {
+            this.renderer.listenGlobal('window', 'mouseup', () => {
                 this.onMouseUp();
             });
 
diff --git a/src/Squidex/app/framework/angular/stars.component.ts b/src/Squidex/app/framework/angular/stars.component.ts
index a6ba25a86..9b751b494 100644
--- a/src/Squidex/app/framework/angular/stars.component.ts
+++ b/src/Squidex/app/framework/angular/stars.component.ts
@@ -89,7 +89,7 @@ export class StarsComponent implements ControlValueAccessor {
 
     public reset() {
         if (this.isDisabled) {
-            return;
+            return false;
         }
 
         if (this.value !== null) {
@@ -105,7 +105,7 @@ export class StarsComponent implements ControlValueAccessor {
 
     public setValue(value: number) {
         if (this.isDisabled) {
-            return;
+            return false;
         }
 
         if (this.value !== value) {
diff --git a/src/Squidex/app/framework/angular/tag-editor.component.ts b/src/Squidex/app/framework/angular/tag-editor.component.ts
index deeef8af1..45efc61fd 100644
--- a/src/Squidex/app/framework/angular/tag-editor.component.ts
+++ b/src/Squidex/app/framework/angular/tag-editor.component.ts
@@ -120,6 +120,8 @@ export class TagEditorComponent implements ControlValueAccessor {
                 return false;
             }
         }
+
+        return true;
     }
 
     private updateItems(items: string[]) {
diff --git a/src/Squidex/app/framework/services/root-view.service.spec.ts b/src/Squidex/app/framework/services/root-view.service.spec.ts
index 269bc274a..d1da6a19b 100644
--- a/src/Squidex/app/framework/services/root-view.service.spec.ts
+++ b/src/Squidex/app/framework/services/root-view.service.spec.ts
@@ -26,7 +26,7 @@ describe('RootViewService', () => {
     });
 
     it('should call view when creating element', () => {
-        let view = {};
+        const view = {};
 
         const viewRef = {
             createEmbeddedView: () => {
diff --git a/src/Squidex/app/framework/services/shortcut.service.spec.ts b/src/Squidex/app/framework/services/shortcut.service.spec.ts
index 8192fa101..94abe8eb0 100644
--- a/src/Squidex/app/framework/services/shortcut.service.spec.ts
+++ b/src/Squidex/app/framework/services/shortcut.service.spec.ts
@@ -25,7 +25,7 @@ describe('ShortcutService', () => {
 
         let isTriggered = false;
 
-        shortcutService.on('ctrl+a', e => { isTriggered = true; });
+        shortcutService.on('ctrl+a', () => { isTriggered = true; });
         shortcutService.trigger('ctrl+a');
 
         expect(isTriggered).toBeTruthy();
@@ -36,7 +36,7 @@ describe('ShortcutService', () => {
 
         let isTriggered = false;
 
-        shortcutService.on('ctrl+a', e => { isTriggered = true; });
+        shortcutService.on('ctrl+a', () => { isTriggered = true; });
         shortcutService.off('ctrl+a');
         shortcutService.trigger('ctrl+a');
 
diff --git a/src/Squidex/app/framework/utils/pager.ts b/src/Squidex/app/framework/utils/pager.ts
index 908680a24..f3e6cc4d8 100644
--- a/src/Squidex/app/framework/utils/pager.ts
+++ b/src/Squidex/app/framework/utils/pager.ts
@@ -21,8 +21,8 @@ export class Pager {
     ) {
         const totalPages = Math.ceil(numberOfItems / this.pageSize);
 
-        if (page >= totalPages && page > 0) {
-            page = this.page = totalPages - 1;
+        if (this.page >= totalPages && this.page > 0) {
+            this.page = this.page = totalPages - 1;
         }
 
         this.itemFirst = numberOfItems === 0 ? 0 : page * this.pageSize + 1;
diff --git a/src/Squidex/app/shared/components/app-form.component.ts b/src/Squidex/app/shared/components/app-form.component.ts
index 5123d4e4b..d75af7e42 100644
--- a/src/Squidex/app/shared/components/app-form.component.ts
+++ b/src/Squidex/app/shared/components/app-form.component.ts
@@ -6,7 +6,7 @@
  */
 
 import { Component, EventEmitter, Output } from '@angular/core';
-import { FormBuilder, FormGroup, Validators } from '@angular/forms';
+import { FormBuilder, Validators } from '@angular/forms';
 
 import { ApiUrlConfig, ValidatorsEx } from 'framework';
 
@@ -32,7 +32,7 @@ export class AppFormComponent {
 
     public createFormError? = '';
     public createFormSubmitted = false;
-    public createForm: FormGroup =
+    public createForm =
         this.formBuilder.group({
             name: ['',
                 [
diff --git a/src/Squidex/app/shared/components/asset.component.ts b/src/Squidex/app/shared/components/asset.component.ts
index 940ecb40b..babbd20cd 100644
--- a/src/Squidex/app/shared/components/asset.component.ts
+++ b/src/Squidex/app/shared/components/asset.component.ts
@@ -6,7 +6,7 @@
  */
 
 import { Component, EventEmitter, Input, OnInit, Output } from '@angular/core';
-import { FormGroup, FormBuilder, Validators } from '@angular/forms';
+import { FormBuilder, Validators } from '@angular/forms';
 
 import { AppComponentBase } from './app.component-base';
 
@@ -60,7 +60,7 @@ export class AssetComponent extends AppComponentBase implements OnInit {
 
     public renameDialog = new ModalView();
     public renameFormSubmitted = false;
-    public renameForm: FormGroup =
+    public renameForm =
         this.formBuilder.group({
             name: ['',
                 [
diff --git a/src/Squidex/app/shared/components/history.component.ts b/src/Squidex/app/shared/components/history.component.ts
index 787952856..0d7d7ef05 100644
--- a/src/Squidex/app/shared/components/history.component.ts
+++ b/src/Squidex/app/shared/components/history.component.ts
@@ -34,13 +34,13 @@ export class HistoryComponent extends AppComponentBase {
         let channelPath = this.route.snapshot.data['channel'];
 
         if (channelPath) {
-            let params = allParams(this.route);
+            const params = allParams(this.route);
 
             for (let key in params) {
                 if (params.hasOwnProperty(key)) {
                     const value = params[key];
 
-                    channelPath = channelPath.replace('{' + key + '}', value);
+                    channelPath = channelPath.replace(`{${key}}`, value);
                 }
             }
         }
diff --git a/src/Squidex/app/shared/components/pipes.ts b/src/Squidex/app/shared/components/pipes.ts
index 524872134..fc97fe540 100644
--- a/src/Squidex/app/shared/components/pipes.ts
+++ b/src/Squidex/app/shared/components/pipes.ts
@@ -220,7 +220,7 @@ export class AssetPreviewUrlPipe implements PipeTransform {
     }
 
     public transform(asset: { id: any, version: Version }): string {
-        return this.apiUrl.buildUrl(`api/assets/${asset.id}?version=${asset.version.value}`)
+        return this.apiUrl.buildUrl(`api/assets/${asset.id}?version=${asset.version.value}`);
     }
 }
 
@@ -241,13 +241,13 @@ export class FileIconPipe implements PipeTransform {
             'xlsx'
         ];
 
-        let mimeIcon = '';
+        let mimeIcon: string;
         let mimeParts = asset.mimeType.split('/');
 
         if (mimeParts.length === 2 && mimeParts[0].toLowerCase() === 'video') {
             mimeIcon = 'video';
         } else {
-            mimeIcon = knownTypes.indexOf(asset.fileType) >= 0 ? asset.fileType : 'generic'
+            mimeIcon = knownTypes.indexOf(asset.fileType) >= 0 ? asset.fileType : 'generic';
         }
 
         return `/images/asset_${mimeIcon}.png`;
diff --git a/src/Squidex/app/shared/services/app-clients.service.spec.ts b/src/Squidex/app/shared/services/app-clients.service.spec.ts
index e8a3f0805..e6c1e5f9f 100644
--- a/src/Squidex/app/shared/services/app-clients.service.spec.ts
+++ b/src/Squidex/app/shared/services/app-clients.service.spec.ts
@@ -35,7 +35,7 @@ describe('AppClientDto', () => {
 });
 
 describe('AppClientsService', () => {
-    let version = new Version('1');
+    const version = new Version('1');
 
     beforeEach(() => {
         TestBed.configureTestingModule({
diff --git a/src/Squidex/app/shared/services/app-contributors.service.spec.ts b/src/Squidex/app/shared/services/app-contributors.service.spec.ts
index b1f617dc4..0529ee3a1 100644
--- a/src/Squidex/app/shared/services/app-contributors.service.spec.ts
+++ b/src/Squidex/app/shared/services/app-contributors.service.spec.ts
@@ -26,7 +26,7 @@ describe('AppContributorDto', () => {
 });
 
 describe('AppContributorsService', () => {
-    let version = new Version('1');
+    const version = new Version('1');
 
     beforeEach(() => {
         TestBed.configureTestingModule({
diff --git a/src/Squidex/app/shared/services/app-languages.service.spec.ts b/src/Squidex/app/shared/services/app-languages.service.spec.ts
index 68059cc8d..2d66de6f5 100644
--- a/src/Squidex/app/shared/services/app-languages.service.spec.ts
+++ b/src/Squidex/app/shared/services/app-languages.service.spec.ts
@@ -30,7 +30,7 @@ describe('AppLanguageDto', () => {
 });
 
 describe('AppLanguagesService', () => {
-    let version = new Version('1');
+    const version = new Version('1');
 
     beforeEach(() => {
         TestBed.configureTestingModule({
diff --git a/src/Squidex/app/shared/services/apps-store.service.spec.ts b/src/Squidex/app/shared/services/apps-store.service.spec.ts
index 1f89a72ec..b90f80a0c 100644
--- a/src/Squidex/app/shared/services/apps-store.service.spec.ts
+++ b/src/Squidex/app/shared/services/apps-store.service.spec.ts
@@ -70,7 +70,7 @@ describe('AppsStoreService', () => {
             result1 = x;
         }).unsubscribe();
 
-        store.createApp(new CreateAppDto('new-name'), now).subscribe(x => { /* Do Nothing */ });
+        store.createApp(new CreateAppDto('new-name'), now).subscribe(() => { /* Do Nothing */ });
 
         store.apps.subscribe(x => {
             result2 = x;
diff --git a/src/Squidex/app/shared/services/assets.service.spec.ts b/src/Squidex/app/shared/services/assets.service.spec.ts
index 5f224bebd..f1d721d10 100644
--- a/src/Squidex/app/shared/services/assets.service.spec.ts
+++ b/src/Squidex/app/shared/services/assets.service.spec.ts
@@ -51,9 +51,9 @@ describe('AssetDto', () => {
 });
 
 describe('AssetsService', () => {
-    let now = DateTime.now();
-    let user = 'me';
-    let version = new Version('1');
+    const now = DateTime.now();
+    const user = 'me';
+    const version = new Version('1');
 
     beforeEach(() => {
         TestBed.configureTestingModule({
diff --git a/src/Squidex/app/shared/services/assets.service.ts b/src/Squidex/app/shared/services/assets.service.ts
index 325c6b981..a11fb7e8f 100644
--- a/src/Squidex/app/shared/services/assets.service.ts
+++ b/src/Squidex/app/shared/services/assets.service.ts
@@ -56,7 +56,7 @@ export class AssetDto {
             update.isImage,
             update.pixelWidth,
             update.pixelHeight,
-            update.version)
+            update.version);
     }
 
     public rename(name: string, user: string, now?: DateTime): AssetDto {
@@ -105,7 +105,7 @@ export class AssetsService {
     }
 
     public getAssets(appName: string, take: number, skip: number, query?: string, mimeTypes?: string[], ids?: string[]): Observable<AssetsDto> {
-        let queries: string[] = [];
+        const queries: string[] = [];
 
         if (mimeTypes && mimeTypes.length > 0) {
             queries.push(`mimeTypes=${mimeTypes.join(',')}`);
diff --git a/src/Squidex/app/shared/services/contents.service.spec.ts b/src/Squidex/app/shared/services/contents.service.spec.ts
index 8e875f384..973a2d19f 100644
--- a/src/Squidex/app/shared/services/contents.service.spec.ts
+++ b/src/Squidex/app/shared/services/contents.service.spec.ts
@@ -53,7 +53,7 @@ describe('ContentDto', () => {
 });
 
 describe('ContentsService', () => {
-    let version = new Version('1');
+    const version = new Version('1');
 
     beforeEach(() => {
         TestBed.configureTestingModule({
@@ -129,7 +129,7 @@ describe('ContentsService', () => {
     it('should append query to get request as search',
         inject([ContentsService, HttpTestingController], (contentsService: ContentsService, httpMock: HttpTestingController) => {
 
-        let contents: ContentsDto | null = null;
+        let contents: ContentsDto | null;
 
         contentsService.getContents('my-app', 'my-schema', 17, 13, 'my-query').subscribe(result => {
             contents = result;
@@ -146,7 +146,7 @@ describe('ContentsService', () => {
     it('should append ids to get request with ids',
         inject([ContentsService, HttpTestingController], (contentsService: ContentsService, httpMock: HttpTestingController) => {
 
-        let contents: ContentsDto | null = null;
+        let contents: ContentsDto | null;
 
         contentsService.getContents('my-app', 'my-schema', 17, 13, null, ['id1', 'id2']).subscribe(result => {
             contents = result;
@@ -163,7 +163,7 @@ describe('ContentsService', () => {
     it('should append query to get request as plain query string',
         inject([ContentsService, HttpTestingController], (contentsService: ContentsService, httpMock: HttpTestingController) => {
 
-        let contents: ContentsDto | null = null;
+        let contents: ContentsDto | null;
 
         contentsService.getContents('my-app', 'my-schema', 17, 13, '$filter=my-filter').subscribe(result => {
             contents = result;
diff --git a/src/Squidex/app/shared/services/graphql.service.spec.ts b/src/Squidex/app/shared/services/graphql.service.spec.ts
index 7a5300a97..f702d2a3b 100644
--- a/src/Squidex/app/shared/services/graphql.service.spec.ts
+++ b/src/Squidex/app/shared/services/graphql.service.spec.ts
@@ -30,7 +30,7 @@ describe('GraphQlService', () => {
     it('should make get request to get history events',
         inject([GraphQlService, HttpTestingController], (graphQlService: GraphQlService, httpMock: HttpTestingController) => {
 
-        let graphQlResult = null;
+        let graphQlResult: any = null;
 
         graphQlService.query('my-app', { }).subscribe(result => {
             graphQlResult = result;
diff --git a/src/Squidex/app/shared/services/graphql.service.ts b/src/Squidex/app/shared/services/graphql.service.ts
index bfc1dcd39..7f1e0a23d 100644
--- a/src/Squidex/app/shared/services/graphql.service.ts
+++ b/src/Squidex/app/shared/services/graphql.service.ts
@@ -20,7 +20,7 @@ export class GraphQlService {
     }
 
     public query(appName: string, params: any): Observable<any> {
-        const url = this.apiUrl.buildUrl(`api/content/${appName}/graphql`)
+        const url = this.apiUrl.buildUrl(`api/content/${appName}/graphql`);
 
         return this.http.post(url, params);
     }
diff --git a/src/Squidex/app/shared/services/help.service.ts b/src/Squidex/app/shared/services/help.service.ts
index 8f94ef66b..a5baba89a 100644
--- a/src/Squidex/app/shared/services/help.service.ts
+++ b/src/Squidex/app/shared/services/help.service.ts
@@ -31,6 +31,6 @@ export class HelpService {
 
                 return result;
             })
-            .catch(err => Observable.of([]));
+            .catch(error => Observable.of([]));
     }
 }
\ No newline at end of file
diff --git a/src/Squidex/app/shared/services/plans.service.spec.ts b/src/Squidex/app/shared/services/plans.service.spec.ts
index afd369e26..536b1ec7a 100644
--- a/src/Squidex/app/shared/services/plans.service.spec.ts
+++ b/src/Squidex/app/shared/services/plans.service.spec.ts
@@ -18,7 +18,7 @@ import {
 } from './../';
 
 describe('PlansService', () => {
-    let version = new Version('1');
+    const version = new Version('1');
 
     beforeEach(() => {
         TestBed.configureTestingModule({
diff --git a/src/Squidex/app/shared/services/schemas.service.spec.ts b/src/Squidex/app/shared/services/schemas.service.spec.ts
index b3f1f7efa..85c082efa 100644
--- a/src/Squidex/app/shared/services/schemas.service.spec.ts
+++ b/src/Squidex/app/shared/services/schemas.service.spec.ts
@@ -160,9 +160,9 @@ describe('SchemaDetailsDto', () => {
 });
 
 describe('SchemasService', () => {
-    let now = DateTime.now();
-    let user = 'me';
-    let version = new Version('1');
+    const now = DateTime.now();
+    const user = 'me';
+    const version = new Version('1');
 
     beforeEach(() => {
         TestBed.configureTestingModule({
diff --git a/src/Squidex/app/shared/services/users-provider.service.ts b/src/Squidex/app/shared/services/users-provider.service.ts
index 986931073..166221e27 100644
--- a/src/Squidex/app/shared/services/users-provider.service.ts
+++ b/src/Squidex/app/shared/services/users-provider.service.ts
@@ -28,7 +28,7 @@ export class UsersProviderService {
         if (!result) {
             const request =
                 this.usersService.getUser(id).retry(2)
-                    .catch(err => {
+                    .catch(error => {
                         return Observable.of(new UserDto('NOT FOUND', 'NOT FOUND', 'NOT FOUND', null, false));
                     })
                     .publishLast();
diff --git a/src/Squidex/app/shared/services/webhooks.service.spec.ts b/src/Squidex/app/shared/services/webhooks.service.spec.ts
index a1ddb7b95..41a6fd4be 100644
--- a/src/Squidex/app/shared/services/webhooks.service.spec.ts
+++ b/src/Squidex/app/shared/services/webhooks.service.spec.ts
@@ -17,7 +17,7 @@ import {
 } from './../';
 
 describe('WebhooksService', () => {
-    let version = new Version('1');
+    const version = new Version('1');
 
     beforeEach(() => {
         TestBed.configureTestingModule({
diff --git a/src/Squidex/app/shell/pages/home/home-page.component.ts b/src/Squidex/app/shell/pages/home/home-page.component.ts
index 3c61e4837..6bd9813c6 100644
--- a/src/Squidex/app/shell/pages/home/home-page.component.ts
+++ b/src/Squidex/app/shell/pages/home/home-page.component.ts
@@ -31,7 +31,7 @@ export class HomePageComponent {
             this.authService.loginPopup()
                 .subscribe(() => {
                     this.router.navigate(['/app']);
-                }, ex => {
+                }, error => {
                     this.showLoginError = true;
                 });
         }