From 84f397c831dd7cd3f8b20eac21e59afa7d7a4367 Mon Sep 17 00:00:00 2001
From: Matthieu Riegler <kyro38@gmail.com>
Date: Tue, 17 Jun 2025 18:34:55 -0700
Subject: [PATCH] refactor(core): Support Error like object for on resource
 errors.

Error like object will be treated as errors.

Related to #61861

(cherry picked from commit 835a6431619360ffbeb91c4496896b8bf1d69074)
---
 .../rxjs-interop/test/rx_resource_spec.ts     | 27 ++++++++++++++++++-
 packages/core/src/resource/resource.ts        | 11 +++++++-
 2 files changed, 36 insertions(+), 2 deletions(-)

diff --git a/packages/core/rxjs-interop/test/rx_resource_spec.ts b/packages/core/rxjs-interop/test/rx_resource_spec.ts
index 6cb4d36b66e..3bfae094a48 100644
--- a/packages/core/rxjs-interop/test/rx_resource_spec.ts
+++ b/packages/core/rxjs-interop/test/rx_resource_spec.ts
@@ -6,7 +6,7 @@
  * found in the LICENSE file at https://angular.dev/license
  */
 
-import {of, Observable, BehaviorSubject} from 'rxjs';
+import {of, Observable, BehaviorSubject, throwError} from 'rxjs';
 import {TestBed} from '../../testing';
 import {ApplicationRef, Injector, signal} from '../../src/core';
 import {rxResource} from '../src';
@@ -88,6 +88,31 @@ describe('rxResource()', () => {
     });
     await appRef.whenStable();
   });
+
+  it('should handle Error like objects', async () => {
+    class FooError implements Error {
+      name = 'FooError';
+      message = 'This is a FooError';
+    }
+
+    const injector = TestBed.inject(Injector);
+    const appRef = TestBed.inject(ApplicationRef);
+
+    const sig = signal(1);
+    const observable = throwError(() => new FooError());
+
+    const rxRes = rxResource({
+      params: sig,
+      stream: () => observable,
+      injector: injector,
+    });
+
+    await appRef.whenStable();
+
+    expect(rxRes.error()).toBeInstanceOf(FooError);
+
+    expect(() => rxRes.value()).toThrowError(/This is a FooError/);
+  });
 });
 
 async function waitFor(fn: () => boolean): Promise<void> {
diff --git a/packages/core/src/resource/resource.ts b/packages/core/src/resource/resource.ts
index 1ed4cafce0f..80974086319 100644
--- a/packages/core/src/resource/resource.ts
+++ b/packages/core/src/resource/resource.ts
@@ -493,13 +493,22 @@ function createDebugNameObject(
 }
 
 export function encapsulateResourceError(error: unknown): Error {
-  if (error instanceof Error) {
+  if (isErrorLike(error)) {
     return error;
   }
 
   return new ResourceWrappedError(error);
 }
 
+export function isErrorLike(error: unknown): error is Error {
+  return (
+    error instanceof Error ||
+    (typeof error === 'object' &&
+      typeof (error as Error).name === 'string' &&
+      typeof (error as Error).message === 'string')
+  );
+}
+
 class ResourceValueError extends Error {
   constructor(error: Error) {
     super(