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/authentication/authentication.guard.ts

@@ -1,5 +1,5 @@
 /** Angular Imports */
-import { Injectable } from '@angular/core';
+import { Injectable, inject } from '@angular/core';
 import { Router } from '@angular/router';
 
 /** Custom Services */
@@ -14,14 +14,8 @@ const log = new Logger('AuthenticationGuard');
  */
 @Injectable()
 export class AuthenticationGuard {
-  /**
-   * @param {Router} router Router for navigation.
-   * @param {AuthenticationService} authenticationService Authentication Service.
-   */
-  constructor(
-    private router: Router,
-    private authenticationService: AuthenticationService
-  ) {}
+  private router = inject(Router);
+  private authenticationService = inject(AuthenticationService);
 
   /**
    * Ensures route access is authorized only when user is authenticated, otherwise redirects to login.

src/app/core/authentication/authentication.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 */
@@ -27,7 +27,7 @@ const twoFactorAccessTokenHeader = 'Fineract-Platform-TFA-Token';
  */
 @Injectable()
 export class AuthenticationInterceptor implements HttpInterceptor {
-  constructor(private settingsService: SettingsService) {}
+  private settingsService = inject(SettingsService);
 
   /**
    * Intercepts a Http request and sets the request headers.

src/app/core/authentication/authentication.service.ts

@@ -1,5 +1,5 @@
 /** Angular Imports */
-import { Injectable } from '@angular/core';
+import { Injectable, inject } from '@angular/core';
 import { HttpClient, HttpParams, HttpHeaders } from '@angular/common/http';
 
 /** rxjs Imports */
@@ -25,6 +25,10 @@ import { OAuth2Token } from './o-auth2-token.model';
  */
 @Injectable()
 export class AuthenticationService {
+  private http = inject(HttpClient);
+  private alertService = inject(AlertService);
+  private authenticationInterceptor = inject(AuthenticationInterceptor);
+
   changePassword(userId: string, passwordObj: any) {
     return this.http.put(`/users/${userId}`, passwordObj);
   }
@@ -61,11 +65,9 @@ export class AuthenticationService {
    * @param {AlertService} alertService Alert Service.
    * @param {AuthenticationInterceptor} authenticationInterceptor Authentication Interceptor.
    */
-  constructor(
-    private http: HttpClient,
-    private alertService: AlertService,
-    private authenticationInterceptor: AuthenticationInterceptor
-  ) {
+  constructor() {
+    const authenticationInterceptor = this.authenticationInterceptor;
+
     this.userLoggedIn = false;
     this.rememberMe = false;
     this.storage = sessionStorage;