ssr service added

npm/ng-packs/packages/core/src/lib/services/ssr.service.ts

@@ -0,0 +1,13 @@
+import { Inject, Injectable, PLATFORM_ID } from '@angular/core';
+import { isPlatformServer } from '@angular/common';
+
+@Injectable({
+  providedIn: 'root',
+})
+export class SSRService {
+  constructor(@Inject(PLATFORM_ID) private platformId: unknown) {}
+
+  isSsr() {
+    return isPlatformServer(this.platformId);
+  }
+}