From a15de8eceea55470907728d9d59acafb853d567a Mon Sep 17 00:00:00 2001
From: Tobias Herber <22559657+herber@users.noreply.github.com>
Date: Tue, 6 Jan 2026 10:28:42 +0100
Subject: [PATCH] Add modifiable error codes

---
 packages/error/CHANGELOG.md         |  6 ++++++
 packages/error/package.json         |  2 +-
 packages/error/src/defaultErrors.ts |  4 +++-
 packages/error/src/error.ts         | 16 ++++++++++++----
 4 files changed, 22 insertions(+), 6 deletions(-)

diff --git a/packages/error/CHANGELOG.md b/packages/error/CHANGELOG.md
index 8982243..be052ba 100644
--- a/packages/error/CHANGELOG.md
+++ b/packages/error/CHANGELOG.md
@@ -1,5 +1,11 @@
 # @lowerdeck/error
 
+## 1.0.9
+
+### Patch Changes
+
+- Make error codes editable
+
 ## 1.0.8
 
 ### Patch Changes
diff --git a/packages/error/package.json b/packages/error/package.json
index 0faf5ff..2b640ef 100644
--- a/packages/error/package.json
+++ b/packages/error/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@lowerdeck/error",
-  "version": "1.0.8",
+  "version": "1.0.9",
   "publishConfig": {
     "access": "public"
   },
diff --git a/packages/error/src/defaultErrors.ts b/packages/error/src/defaultErrors.ts
index 65eae1d..78739c1 100644
--- a/packages/error/src/defaultErrors.ts
+++ b/packages/error/src/defaultErrors.ts
@@ -25,7 +25,9 @@ export let badRequestError = createError({
   message: 'The request is invalid.'
 });
 
-export function notFoundError(p1: { entity: string; id?: string } & Partial<ErrorData<'not_found', 404>>): ReturnType<typeof createError>;
+export function notFoundError(
+  p1: { entity: string; id?: string } & Partial<ErrorData<'not_found', 404>>
+): ReturnType<typeof createError>;
 export function notFoundError(p1: string, p2?: string | null): ReturnType<typeof createError>;
 export function notFoundError(p1: any, p2?: any): ReturnType<typeof createError> {
   let entity = typeof p1 == 'string' ? p1 : p1.entity;
diff --git a/packages/error/src/error.ts b/packages/error/src/error.ts
index 8bab5dd..f527672 100644
--- a/packages/error/src/error.ts
+++ b/packages/error/src/error.ts
@@ -8,27 +8,35 @@ export interface ErrorData<Code extends string, Status extends number> {
   [key: string]: any;
 }
 
+export type ErrorRecordExtension<Code extends string, Status extends number> = <
+  NewCode extends string = Code
+>(
+  extension?: Partial<ErrorData<NewCode, Status>>
+) => ErrorRecord<NewCode, Status>;
+
 export type ErrorRecord<Code extends string, Status extends number> = {
   object: 'error';
   data: ErrorData<Code, Status>;
   toResponse: () => ErrorData<Code, Status> & { object: 'error'; ok: false };
-} & ((extension?: Partial<ErrorData<Code, Status>>) => ErrorRecord<Code, Status>);
+} & ErrorRecordExtension<Code, Status>;
 
 export let createError = <Code extends string, Status extends number>(
   data: ErrorData<Code, Status>
 ): ErrorRecord<Code, Status> => {
   return Object.assign(
-    (extension: Partial<ErrorData<Code, Status>> = {}): ErrorRecord<Code, Status> =>
+    <NewCode extends string = Code>(
+      extension: Partial<ErrorData<NewCode, Status>> = {}
+    ): ErrorRecord<NewCode, Status> =>
       createError({
         ...data,
         ...extension
-      }),
+      }) as any,
     {
       object: 'error' as const,
       data,
       toResponse: () => ({ object: 'error' as const, ok: false as const, ...data })
     }
-  );
+  ) as any;
 };
 
 export class ServiceError<InnerError extends ErrorRecord<any, any>> extends Error {