Upgrading to Angular 20:

Replaced checked in package-lock.json by regenerated one.
Ran ng update @angular/core@20 @angular/cli@20
Ran npm install @angular-builders/jest@^20.0.0 @fortawesome/angular-fontawesome@^3.0.0 @swimlane/ngx-graph@^11
Ran npm install ngx-mat-select-search@^8.0.2.
Ran ng update @angular/material@20.
Updated all eslint and typescript to the latest versions.
Removed @angular-devkit/schematics.
Updated fontawesome.
Updated rxjs and tslib.
Moved required node version from 16 to 20.
Updated jest-preset-angular.
Set preserveWhitespaces to false.
Corrected two type declarations in two typescript files to make ng serve run without errors.
Removed unused angular-devkit/schematics from view-user.component.ts .
Updated list of supported browsers.
Upgraded prettier.
Ran prettier . --write the first time.
Ran prettier . --write the second time.
Ran ng generate @angular/core:inject with defaults, excepted a handful of files.
Fixed remaining eslint problems.
Added dist directory to ignores in eslint.config.js.
Let prettier fix formatting, almost everything is just line breaks.
Made htmlhint ignore @if and @for Angular constructs.
Updated node version in Github workflow to 22.12.0 (build.yml).
Updated .env.ts.
Updated Angular datetime format strings from YYYY-MM-DD to yyyy-MM-dd.
Merged changes from dev into angular20 branch.

src/app/core/http/api-prefix.interceptor.ts

@@ -1,5 +1,5 @@
 /** Angular Imports */
-import { Injectable } from '@angular/core';
+import { Injectable, inject } from '@angular/core';
 import { HttpEvent, HttpInterceptor, HttpHandler, HttpRequest } from '@angular/common/http';
 
 /** rxjs Imports */
@@ -13,10 +13,7 @@ import { SettingsService } from 'app/settings/settings.service';
  */
 @Injectable()
 export class ApiPrefixInterceptor implements HttpInterceptor {
-  /**
-   * @param {SettingsService} settingsService Settings Service
-   */
-  constructor(private settingsService: SettingsService) {}
+  private settingsService = inject(SettingsService);
 
   /**
    * Intercepts a Http request and prefixes it with `serverUrl`.

src/app/core/http/cache.interceptor.ts

@@ -17,6 +17,7 @@ import { environment } from '../../../environments/environment';
 export class CacheInterceptor implements HttpInterceptor {
   private forceUpdate = false;
 
+  // eslint-disable-next-line @angular-eslint/prefer-inject
   constructor(private httpCacheService: HttpCacheService) {}
 
   /**

src/app/core/http/error-handler.interceptor.ts

@@ -1,5 +1,5 @@
 /** Angular Imports */
-import { Injectable } from '@angular/core';
+import { Injectable, inject } from '@angular/core';
 import { HttpEvent, HttpInterceptor, HttpHandler, HttpRequest, HttpErrorResponse } from '@angular/common/http';
 
 /** rxjs Imports */
@@ -22,14 +22,8 @@ const log = new Logger('ErrorHandlerInterceptor');
  */
 @Injectable()
 export class ErrorHandlerInterceptor implements HttpInterceptor {
-  /**
-   * @param {AlertService} alertService Alert Service.
-   * @param {TranslateService} translate Translation Service.
-   */
-  constructor(
-    private alertService: AlertService,
-    private translate: TranslateService // Added TranslateService
-  ) {}
+  private alertService = inject(AlertService);
+  private translate = inject(TranslateService);
 
   /**
    * Intercepts a Http request and adds a default error handler.

src/app/core/http/http.service.ts

@@ -1,3 +1,4 @@
+/* eslint-disable @angular-eslint/prefer-inject */
 /** Angular Imports */
 import { Inject, Injectable, InjectionToken, Injector, Optional } from '@angular/core';
 import { HttpClient, HttpEvent, HttpInterceptor, HttpHandler, HttpRequest } from '@angular/common/http';
@@ -81,7 +82,8 @@ export class HttpService extends HttpClient {
       // Configure default interceptors that can be disabled here
       this.interceptors = [
         this.injector.get(ApiPrefixInterceptor),
-        this.injector.get(ErrorHandlerInterceptor)];
+        this.injector.get(ErrorHandlerInterceptor)
+      ];
     }
   }