From b5273b596af82228f8a9dbfd636f7eba207e68fa Mon Sep 17 00:00:00 2001
From: Jannis Braun <151788261+TheZwiss@users.noreply.github.com>
Date: Sun, 3 May 2026 04:07:46 +0200
Subject: [PATCH] feat(desktop): add extractErrorCode helper for updater errors

---
 packages/desktop/src/recovery.test.ts | 30 ++++++++++++++++++++++++++-
 packages/desktop/src/recovery.ts      |  8 +++++++
 2 files changed, 37 insertions(+), 1 deletion(-)

diff --git a/packages/desktop/src/recovery.test.ts b/packages/desktop/src/recovery.test.ts
index 97b540e0..3164662e 100644
--- a/packages/desktop/src/recovery.test.ts
+++ b/packages/desktop/src/recovery.test.ts
@@ -1,5 +1,5 @@
 import { describe, it, expect, vi } from 'vitest';
-import { RecoveryStateStore, type RecoveryState } from './recovery';
+import { RecoveryStateStore, extractErrorCode, type RecoveryState } from './recovery';
 
 describe('RecoveryStateStore', () => {
   it('returns the initial state', () => {
@@ -104,3 +104,31 @@ describe('RecoveryStateStore', () => {
     expect(Object.isFrozen(s)).toBe(true);
   });
 });
+
+describe('extractErrorCode', () => {
+  it('extracts string code from Error-like object', () => {
+    const err = new Error('boom') as Error & { code: string };
+    err.code = 'ENOSPC';
+    expect(extractErrorCode(err)).toBe('ENOSPC');
+  });
+
+  it('returns null for Error without code', () => {
+    expect(extractErrorCode(new Error('boom'))).toBeNull();
+  });
+
+  it('returns null when code is non-string', () => {
+    const err = { code: 42 };
+    expect(extractErrorCode(err)).toBeNull();
+  });
+
+  it('returns null for null/undefined/primitives', () => {
+    expect(extractErrorCode(null)).toBeNull();
+    expect(extractErrorCode(undefined)).toBeNull();
+    expect(extractErrorCode('string')).toBeNull();
+    expect(extractErrorCode(42)).toBeNull();
+  });
+
+  it('handles plain objects with code', () => {
+    expect(extractErrorCode({ code: 'NET_FAIL' })).toBe('NET_FAIL');
+  });
+});
diff --git a/packages/desktop/src/recovery.ts b/packages/desktop/src/recovery.ts
index edde5074..1d83e95d 100644
--- a/packages/desktop/src/recovery.ts
+++ b/packages/desktop/src/recovery.ts
@@ -71,3 +71,11 @@ export class RecoveryStateStore {
 }
 
 export const recoveryStore = new RecoveryStateStore();
+
+export function extractErrorCode(err: unknown): string | null {
+  if (typeof err === 'object' && err !== null && 'code' in err) {
+    const code = (err as { code: unknown }).code;
+    return typeof code === 'string' ? code : null;
+  }
+  return null;
+}