fix(service-worker): do not register service worker if app is destroyed before it is ready to register (#61101)

In this commit, we check whether the application is destroyed before calling `serviceWorker.register(...)`. We should not register the worker because other resources will not be available.

PR Close #61101

packages/service-worker/src/provider.ts

@@ -92,7 +92,14 @@ export function ngswAppInitializer(): void {
 
     // Don't return anything to avoid blocking the application until the SW is registered.
     // Catch and log the error if SW registration fails to avoid uncaught rejection warning.
-    readyToRegister.then(() =>
+    readyToRegister.then(() => {
+      // If the registration strategy has resolved after the application has
+      // been explicitly destroyed by the user (e.g., by navigating away to
+      // another application), we simply should not register the worker.
+      if (appRef.destroyed) {
+        return;
+      }
+
       navigator.serviceWorker
         .register(script, {scope: options.scope})
         .catch((err) =>
@@ -103,8 +110,8 @@ export function ngswAppInitializer(): void {
                 'Service worker registration failed with: ' + err,
             ),
           ),
-        ),
-    );
+        );
+    });
   });
 }
 

packages/service-worker/test/provider_spec.ts

@@ -364,6 +364,17 @@ async function waitForReadyToRegister() {
           );
           expect(swRegisterSpy).not.toHaveBeenCalled();
         });
+
+        it('should not register service worker if app was destroyed before it was ready to register', async () => {
+          const registerSub = new Subject<void>();
+          configTestBedWithMockedStability(() => registerSub);
+          expect(swRegisterSpy).not.toHaveBeenCalled();
+          // Given that the app is destroyed (e.g., by calling `ApplicationRef.destroy()`)
+          // before the `readyToRegister` promise resolves and `serviceWorker.register(...)` is called.
+          TestBed.resetTestingModule();
+          await waitForReadyToRegister();
+          expect(swRegisterSpy).not.toHaveBeenCalled();
+        });
       });
     });
   });