From aa7b5deb6e475bd5cc11fc38f047b9b6a15592e6 Mon Sep 17 00:00:00 2001
From: Will-hxw <xiaoweihuacqu@gmail.com>
Date: Sun, 17 May 2026 19:35:22 +0800
Subject: [PATCH 1/2] fix(openapi-react-query): propagate undefined errors from
 openapi-fetch

Use  instead of  truthiness check to properly
handle cases where openapi-fetch returns  for
non-OK responses with empty bodies.

Closes #2070
---
 packages/openapi-react-query/src/index.ts     | 10 +++----
 .../openapi-react-query/test/index.test.tsx   | 27 +++++++++++++++++++
 2 files changed, 32 insertions(+), 5 deletions(-)

diff --git a/packages/openapi-react-query/src/index.ts b/packages/openapi-react-query/src/index.ts
index fb9683164..b6c2ef14e 100644
--- a/packages/openapi-react-query/src/index.ts
+++ b/packages/openapi-react-query/src/index.ts
@@ -200,7 +200,7 @@ export default function createClient<Paths extends {}, Media extends MediaType =
     const mth = method.toUpperCase() as Uppercase<typeof method>;
     const fn = client[mth] as ClientMethod<Paths, typeof method, Media>;
     const { data, error, response } = await fn(path, { signal, ...(init as any) }); // TODO: find a way to avoid as any
-    if (error) {
+    if (!response.ok) {
       throw error;
     }
     if (response.status === 204 || response.headers.get("Content-Length") === "0") {
@@ -247,8 +247,8 @@ export default function createClient<Paths extends {}, Media extends MediaType =
               },
             };
 
-            const { data, error } = await fn(path, mergedInit as any);
-            if (error) {
+            const { data, error, response } = await fn(path, mergedInit as any);
+            if (!response.ok) {
               throw error;
             }
             return data;
@@ -265,8 +265,8 @@ export default function createClient<Paths extends {}, Media extends MediaType =
           mutationFn: async (init) => {
             const mth = method.toUpperCase() as Uppercase<typeof method>;
             const fn = client[mth] as ClientMethod<Paths, typeof method, Media>;
-            const { data, error } = await fn(path, init as InitWithUnknowns<typeof init>);
-            if (error) {
+            const { data, error, response } = await fn(path, init as InitWithUnknowns<typeof init>);
+            if (!response.ok) {
               throw error;
             }
 
diff --git a/packages/openapi-react-query/test/index.test.tsx b/packages/openapi-react-query/test/index.test.tsx
index 78715e643..89a34ac89 100644
--- a/packages/openapi-react-query/test/index.test.tsx
+++ b/packages/openapi-react-query/test/index.test.tsx
@@ -336,6 +336,33 @@ describe("client", () => {
       expect(data).toBeUndefined();
     });
 
+    it("should propagate error when response is not ok with empty body", async () => {
+      const fetchClient = createFetchClient<paths>({ baseUrl });
+      const client = createClient(fetchClient);
+
+      useMockRequestHandler({
+        baseUrl,
+        method: "get",
+        path: "/string-array",
+        status: 500,
+        headers: {
+          "Content-Length": "0",
+        },
+        body: undefined,
+      });
+
+      const { result } = renderHook(() => client.useQuery("get", "/string-array"), {
+        wrapper,
+      });
+
+      await waitFor(() => expect(result.current.isFetching).toBe(false));
+
+      const { data, error } = result.current;
+
+      expect(error).toBeUndefined();
+      expect(data).toBeUndefined();
+    });
+
     it("should resolve data properly and have error as null when queryFn returns null", async () => {
       const fetchClient = createFetchClient<paths>({ baseUrl });
       const client = createClient(fetchClient);

From 19e40ed836bbdb59283fd070175a88f71b97f02c Mon Sep 17 00:00:00 2001
From: Will-hxw <xiaoweihuacqu@gmail.com>
Date: Sun, 17 May 2026 19:43:40 +0800
Subject: [PATCH 2/2] chore: add changeset

---
 .changeset/fix-propagate-undefined-errors.md | 7 +++++++
 1 file changed, 7 insertions(+)
 create mode 100644 .changeset/fix-propagate-undefined-errors.md

diff --git a/.changeset/fix-propagate-undefined-errors.md b/.changeset/fix-propagate-undefined-errors.md
new file mode 100644
index 000000000..ea43cf486
--- /dev/null
+++ b/.changeset/fix-propagate-undefined-errors.md
@@ -0,0 +1,7 @@
+---
+"openapi-react-query": patch
+---
+
+fix(openapi-react-query): propagate undefined errors from openapi-fetch
+
+Use `!response.ok` instead of `error` truthiness check to properly handle cases where openapi-fetch returns `error: undefined` for non-OK responses with empty bodies.