Now everything is actually working again.

frontend/ng-karaoqueue/angular.json

@@ -13,11 +13,12 @@
         "build": {
           "builder": "@angular-devkit/build-angular:browser",
           "options": {
+            "preserveSymlinks": true,
             "outputPath": "dist/ng-karaoqueue",
             "index": "src/index.html",
             "main": "src/main.ts",
             "polyfills": "src/polyfills.ts",
-            "tsConfig": "tsconfig.app.json",
+            "tsConfig": "src/tsconfig.json",
             "aot": false,
             "assets": [
               "src/favicon.ico",

frontend/ng-karaoqueue/src/app/app.component.ts

@@ -1,4 +1,5 @@
 import { Component, OnInit } from '@angular/core';
+import { RuntimeConfigLoaderService } from 'runtime-config-loader';
  
 
 @Component({

frontend/ng-karaoqueue/src/app/app.module.ts

@@ -1,5 +1,6 @@
 import { BrowserModule, DomSanitizer } from '@angular/platform-browser';
 import { NgModule } from '@angular/core';
+import { RuntimeConfigLoaderModule } from 'runtime-config-loader';
 
 import { AppRoutingModule } from './app-routing.module';
 import { AppComponent } from './app.component';

frontend/ng-karaoqueue/src/app/song-service.service.ts

@@ -26,11 +26,11 @@ export class SongServiceService {
 
     let out = new Array<Song>();
 
-/*    this.http.get(this.api +"/songs/compl?search="+text).subscribe((data: JSON) => {
+    this.http.get(this.api +"/songs/compl?search="+text).subscribe((data: Observable<JSON>) => {
       data.forEach(element => {
         out.push(new Song(element["title"],element["artist"],element["karafun_id"],element["duo"],element["explicit"],element["_id"],element["styles"],element["languages"]));
       });
-    });*/
+    });
 
     const observable = new Observable<Array<Song>>( subscriber => {
       subscriber.next(out);

frontend/ng-karaoqueue/src/custom-theme.scss

@@ -142,7 +142,7 @@ $mat-dark-theme-background: (
 );
 
 // Compute font config
-@include mat-core($fontConfig);
+@include mat-core();
 
 // Theme Config
 

frontend/ng-karaoqueue/src/main.ts

@@ -0,0 +1,4 @@
+import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
+import { AppModule } from './app/app.module';
+
+platformBrowserDynamic().bootstrapModule(AppModule);

frontend/ng-karaoqueue/src/polyfills.ts

@@ -0,0 +1,61 @@
+/**
+ * @license
+ * Copyright Google LLC All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+/**
+ * This file includes polyfills needed by Angular and is loaded before the app.
+ * You can add your own extra polyfills to this file.
+ *
+ * This file is divided into 2 sections:
+ *   1. Browser polyfills. These are applied before loading ZoneJS and are sorted by browsers.
+ *   2. Application imports. Files imported after ZoneJS that should be loaded before your main
+ *      file.
+ *
+ * The current setup is for so-called "evergreen" browsers; the last versions of browsers that
+ * automatically update themselves. This includes recent versions of Safari, Chrome (including
+ * Opera), Edge on the desktop, and iOS and Chrome on mobile.
+ *
+ * Learn more in https://angular.io/guide/browser-support
+ */
+
+/***************************************************************************************************
+ * BROWSER POLYFILLS
+ */
+
+/**
+ * By default, zone.js will patch all possible macroTask and DomEvents
+ * user can disable parts of macroTask/DomEvents patch by setting following flags
+ * because those flags need to be set before `zone.js` being loaded, and webpack
+ * will put import in the top of bundle, so user need to create a separate file
+ * in this directory (for example: zone-flags.ts), and put the following flags
+ * into that file, and then add the following code before importing zone.js.
+ * import './zone-flags';
+ *
+ * The flags allowed in zone-flags.ts are listed here.
+ *
+ * The following flags will work for all browsers.
+ *
+ * (window as any).__Zone_disable_requestAnimationFrame = true; // disable patch requestAnimationFrame
+ * (window as any).__Zone_disable_on_property = true; // disable patch onProperty such as onclick
+ * (window as any).__zone_symbol__UNPATCHED_EVENTS = ['scroll', 'mousemove']; // disable patch specified eventNames
+ *
+ *  in IE/Edge developer tools, the addEventListener will also be wrapped by zone.js
+ *  with the following flag, it will bypass `zone.js` patch for IE/Edge
+ *
+ *  (window as any).__Zone_enable_cross_context_check = true;
+ *
+ */
+
+/***************************************************************************************************
+ * Zone JS is required by default for Angular itself.
+ */
+import 'zone.js';  // Included with Angular CLI.
+
+
+/***************************************************************************************************
+ * APPLICATION IMPORTS
+ */

frontend/ng-karaoqueue/src/test.ts

@@ -0,0 +1,34 @@
+/**
+ * @license
+ * Copyright Google LLC All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+// This file is required by karma.conf.js and loads recursively all the .spec and framework files
+
+import 'zone.js/testing';
+import { getTestBed } from '@angular/core/testing';
+import {
+  BrowserDynamicTestingModule,
+  platformBrowserDynamicTesting
+} from '@angular/platform-browser-dynamic/testing';
+
+declare const require: {
+  context(path: string, deep?: boolean, filter?: RegExp): {
+    <T>(id: string): T;
+    keys(): string[];
+  };
+};
+
+// First, initialize the Angular testing environment.
+getTestBed().initTestEnvironment(
+  BrowserDynamicTestingModule,
+  platformBrowserDynamicTesting(),
+);
+
+// Then we find all the tests.
+const context = require.context('./', true, /\.spec\.ts$/);
+// And load the modules.
+context.keys().forEach(context);

frontend/ng-karaoqueue/src/tsconfig.json

@@ -0,0 +1,28 @@
+{
+  "compilerOptions": {
+    "baseUrl": "",
+    "declaration": false,
+    "downlevelIteration": true,
+    "experimentalDecorators": true,
+    "lib": [
+      "es6",
+      "dom"
+    ],
+    "mapRoot": "./",
+    "module": "ES2022",
+    "moduleResolution": "node",
+    "outDir": "../dist/out-tsc",
+    "sourceMap": true,
+    "target": "ES2022",
+    "skipLibCheck": true,
+    "typeRoots": [
+      "../node_modules/@types"
+    ],
+    "useDefineForClassFields": false
+  },
+  "include": [
+    "main.ts",
+    "polyfills.ts",
+    "src/**/*.d.ts"
+  ]
+}

frontend/ng-karaoqueue/tsconfig.app.json

@@ -7,6 +7,8 @@
   },
   "files": [
     "src/app/app.module.ts",
+    "src/main.ts",
+    "src/polyfills.ts"
   ],
   "include": [
     "src/**/*.d.ts"

frontend/ng-karaoqueue/tsconfig.json

@@ -1,32 +1,17 @@
-/* To learn more about this file see: https://angular.io/config/tsconfig. */
+/*
+  This is a "Solution Style" tsconfig.json file, and is used by editors and TypeScript’s language server to improve development experience.
+  It is not intended to be used to perform a compilation.
+
+  To learn more about this file see: https://angular.io/config/solution-tsconfig.
+*/
 {
-    "compileOnSave": false,
+    "files": [],
+    "references": [
+      {
+        "path": "./src/tsconfig.json"
+      }
+    ],
     "compilerOptions": {
-      "baseUrl": "src",
-      "outDir": "./dist/out-tsc",
-      "forceConsistentCasingInFileNames": true,
-      "strict": true,
-      "noImplicitOverride": true,
-      "noPropertyAccessFromIndexSignature": true,
-      "noImplicitReturns": true,
-      "noFallthroughCasesInSwitch": true,
-      "sourceMap": true,
-      "declaration": false,
-      "downlevelIteration": true,
-      "experimentalDecorators": true,
-      "moduleResolution": "node",
-      "importHelpers": true,
-      "target": "es2020",
-      "module": "es2020",
-      "lib": [
-        "es2020",
-        "dom"
-      ]
-    },
-    "angularCompilerOptions": {
-      "enableI18nLegacyMessageIdFormat": false,
-      "strictInjectionParameters": true,
-      "strictInputAccessModifiers": true,
-      "strictTemplates": true
+      "target": "ES2022",
     }
 }