Fix lint errors and add a changeset

Author: illright

.changeset/gold-worms-wave.md

@@ -0,0 +1,6 @@
+---
+"openapi-typescript-helpers": patch
+"openapi-fetch": patch
+---
+
+Fix data/error discrimination when there are empty-body errors

packages/openapi-fetch/src/index.d.ts

@@ -115,15 +115,23 @@ export type FetchOptions<T> = RequestOptions<T> &
 export type FetchResponse<T, O, Media extends MediaType> =
   | {
       data: ParseAsResponse<
-      GetValueWithDefault<SuccessResponse<ResponseObjectMap<T>>, Media, Record<string, never>>,
+        GetValueWithDefault<
+          SuccessResponse<ResponseObjectMap<T>>,
+          Media,
+          Record<string, never>
+        >,
         O
       >;
       error?: never;
       response: Response;
     }
   | {
       data?: never;
-      error: GetValueWithDefault<ErrorResponse<ResponseObjectMap<T>>, Media, Record<string, never>>;
+      error: GetValueWithDefault<
+        ErrorResponse<ResponseObjectMap<T>>,
+        Media,
+        Record<string, never>
+      >;
       response: Response;
     };
 

packages/openapi-fetch/test/index.test-d.ts

@@ -11,14 +11,20 @@ interface Blogpost {
   publish_date?: number | undefined;
 }
 
+// This is a type test that will not be executed
+// eslint-disable-next-line vitest/expect-expect
 test("the error type works properly", async () => {
   const value = await GET("/blogposts");
 
   if (value.data) {
     expectTypeOf(value.data).toEqualTypeOf<Array<Blogpost>>();
   } else {
     expectTypeOf(value.data).toBeUndefined();
-    expectTypeOf(value.error).extract<{ code: number }>().toEqualTypeOf<{ code: number; message: string }>();
-    expectTypeOf(value.error).exclude<{ code: number }>().toEqualTypeOf<Record<string, never>>();
+    expectTypeOf(value.error)
+      .extract<{ code: number }>()
+      .toEqualTypeOf<{ code: number; message: string }>();
+    expectTypeOf(value.error)
+      .exclude<{ code: number }>()
+      .toEqualTypeOf<Record<string, never>>();
   }
 });