[DURACOM-240] split service into SSR and CSR

src/app/core/shared/server-math.service.ts

@@ -0,0 +1,49 @@
+import { Injectable } from '@angular/core';
+import {
+  Observable,
+  ReplaySubject,
+  Subject,
+} from 'rxjs';
+
+import {
+  MathJaxConfig,
+  MathService,
+} from './math.service';
+
+@Injectable({
+  providedIn: 'root',
+})
+export class ServerMathService extends MathService {
+
+  protected signal: Subject<boolean>;
+
+  protected mathJaxOptions = {};
+
+  protected mathJax: MathJaxConfig = {
+    source: '',
+    id: '',
+  };
+  protected mathJaxFallback: MathJaxConfig = {
+    source: '',
+    id: '',
+  };
+
+  constructor() {
+    super();
+
+    this.signal = new ReplaySubject<boolean>(1);
+    this.signal.next(true);
+  }
+
+  protected async registerMathJaxAsync(config: MathJaxConfig): Promise<any> {
+    return Promise.resolve();
+  }
+
+  ready(): Observable<boolean> {
+    return this.signal;
+  }
+
+  render(element: HTMLElement) {
+    return;
+  }
+}