fix(transloco): prevent loading translations when injector is destroyed

Author: arturovt

libs/transloco/src/lib/transloco.service.ts

@@ -109,6 +109,7 @@ export class TranslocoService {
   };
 
   private destroyRef = inject(DestroyRef);
+  private destroyed = false;
 
   constructor(
     @Optional() @Inject(TRANSLOCO_LOADER) private loader: TranslocoLoader,
@@ -144,6 +145,7 @@ export class TranslocoService {
     });
 
     this.destroyRef.onDestroy(() => {
+      this.destroyed = true;
       // Complete subjects to release observers if users forget to unsubscribe manually.
       // This is important in server-side rendering.
       this.lang.complete();
@@ -192,7 +194,15 @@ export class TranslocoService {
     return this.availableLangs;
   }
 
-  load(path: string, options: LoadOptions = {}): Observable<Translation> {
+load(path: string, options: LoadOptions = {}): Observable<Translation> {
+  // If the application has already been destroyed, return an empty observable.
+  // We use EMPTY instead of NEVER to ensure the observable completes.
+  // This is important for operators like switchMap, which rely on the inner observable completing
+  // before they can subscribe to the next one. NEVER would hang the chain indefinitely.
+  if (this.destroyed) {
+    return EMPTY;
+  }
+
     const cached = this.cache.get(path);
     if (cached) {
       return cached;