fix(signals): enable withProps to handle Symbols

modules/signals/spec/with-props.spec.ts

@@ -1,7 +1,8 @@
 import { signal } from '@angular/core';
 import { of } from 'rxjs';
-import { withMethods, withProps, withState } from '../src';
+import { signalStore, withMethods, withProps, withState } from '../src';
 import { getInitialInnerStore } from '../src/signal-store';
+import { TestBed } from '@angular/core/testing';
 
 describe('withProps', () => {
   it('adds properties to the store immutably', () => {
@@ -47,4 +48,24 @@ describe('withProps', () => {
       's1, p2, m1'
     );
   });
+
+  it('allows symbols as props', () => {
+    const SECRET = Symbol('SECRET');
+
+    const Store = signalStore(withProps(() => ({ [SECRET]: 'secret' })));
+    const store = TestBed.configureTestingModule({ providers: [Store] }).inject(
+      Store
+    );
+
+    expect(store[SECRET]).toBe('secret');
+  });
+
+  it('allows numbers as props', () => {
+    const Store = signalStore(withProps(() => ({ 1: 'Number One' })));
+    const store = TestBed.configureTestingModule({ providers: [Store] }).inject(
+      Store
+    );
+
+    expect(store[1]).toBe('Number One');
+  });
 });

modules/signals/src/signal-store.ts

@@ -1355,12 +1355,18 @@ export function signalStore(
         getInitialInnerStore()
       );
       const { stateSignals, props, methods, hooks } = innerStore;
-      const storeMembers = { ...stateSignals, ...props, ...methods };
+      const storeMembers: Record<string | symbol, unknown> = {
+        ...stateSignals,
+        ...props,
+        ...methods,
+      };
 
       (this as any)[STATE_SOURCE] = innerStore[STATE_SOURCE];
 
-      for (const key in storeMembers) {
-        (this as any)[key] = storeMembers[key];
+      for (const key of Reflect.ownKeys(storeMembers)) {
+        if (typeof key === 'string' || typeof key === 'symbol') {
+          (this as any)[key] = storeMembers[key];
+        }
       }
 
       const { onInit, onDestroy } = hooks;