From 3f827aea051d9c1b7ab3d9a98f01dbafc8d6f546 Mon Sep 17 00:00:00 2001
From: Sebastien Guillemot <sebastiengllmt@gmail.com>
Date: Fri, 9 Aug 2024 05:27:03 +0900
Subject: [PATCH 1/4] Add MethodResponse utility type

---
 packages/openapi-fetch/src/index.d.ts | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/packages/openapi-fetch/src/index.d.ts b/packages/openapi-fetch/src/index.d.ts
index e7e7f96b6..c1fdbd5a5 100644
--- a/packages/openapi-fetch/src/index.d.ts
+++ b/packages/openapi-fetch/src/index.d.ts
@@ -190,6 +190,20 @@ export interface Client<Paths extends {}, Media extends MediaType = MediaType> {
   eject(...middleware: Middleware[]): void;
 }
 
+export type ClientPathsWithMethod<
+  CreatedClient extends Client<any, any>,
+  Method extends HttpMethod,
+> = CreatedClient extends Client<infer Paths, infer _Media> ? PathsWithMethod<Paths, Method> : never;
+
+export type MethodResponse<
+  CreatedClient extends Client<any, any>,
+  Method extends HttpMethod,
+  Path extends ClientPathsWithMethod<CreatedClient, Method>,
+  Options = {},
+> = CreatedClient extends Client<infer Paths extends { [key: string]: any }, infer Media extends MediaType>
+  ? NonNullable<FetchResponse<Paths[Path][Method], Options, Media>["data"]>
+  : never;
+
 export default function createClient<Paths extends {}, Media extends MediaType = MediaType>(
   clientOptions?: ClientOptions,
 ): Client<Paths, Media>;

From 1b967da5c653a93cdc414d41147dc4d937c90526 Mon Sep 17 00:00:00 2001
From: Sebastien Guillemot <sebastiengllmt@gmail.com>
Date: Sat, 10 Aug 2024 13:53:43 +0900
Subject: [PATCH 2/4] Add type test for MethodResponse

---
 packages/openapi-fetch/test/index.test.ts | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/packages/openapi-fetch/test/index.test.ts b/packages/openapi-fetch/test/index.test.ts
index 0055dcba7..2f89be2de 100644
--- a/packages/openapi-fetch/test/index.test.ts
+++ b/packages/openapi-fetch/test/index.test.ts
@@ -1,6 +1,7 @@
 import { HttpResponse, type StrictResponse } from "msw";
 import { afterAll, beforeAll, describe, expect, expectTypeOf, it } from "vitest";
 import createClient, {
+  type MethodResponse,
   type Middleware,
   type MiddlewareCallbackParams,
   type QuerySerializerOptions,
@@ -132,6 +133,7 @@ describe("client", () => {
           created_at: number;
           updated_at: number;
         }>();
+        expectTypeOf(result.data).toEqualTypeOf<MethodResponse<typeof client, 'get', '/mismatched-errors'>>();
       } else {
         expectTypeOf(result.data).toBeUndefined();
         expectTypeOf(result.error).extract<{ code: number }>().toEqualTypeOf<{ code: number; message: string }>();

From 3bafebf6e2fb256fffca5f3e46e352eb8beda0ef Mon Sep 17 00:00:00 2001
From: Sebastien Guillemot <sebastiengllmt@gmail.com>
Date: Sat, 10 Aug 2024 13:57:55 +0900
Subject: [PATCH 3/4] add cahngeset

---
 .changeset/hip-years-invite.md | 5 +++++
 1 file changed, 5 insertions(+)
 create mode 100644 .changeset/hip-years-invite.md

diff --git a/.changeset/hip-years-invite.md b/.changeset/hip-years-invite.md
new file mode 100644
index 000000000..4a751730b
--- /dev/null
+++ b/.changeset/hip-years-invite.md
@@ -0,0 +1,5 @@
+---
+"openapi-fetch": patch
+---
+
+Add MethodResponse utility type to easily get the return type of an endpoint on a client

From d51ed16ba05cd40f484f02d562fbcaabed8fd809 Mon Sep 17 00:00:00 2001
From: Sebastien Guillemot <sebastiengllmt@gmail.com>
Date: Sat, 10 Aug 2024 14:02:59 +0900
Subject: [PATCH 4/4] fix formatting

---
 packages/openapi-fetch/test/index.test.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/openapi-fetch/test/index.test.ts b/packages/openapi-fetch/test/index.test.ts
index 2f89be2de..352ac6f9f 100644
--- a/packages/openapi-fetch/test/index.test.ts
+++ b/packages/openapi-fetch/test/index.test.ts
@@ -133,7 +133,7 @@ describe("client", () => {
           created_at: number;
           updated_at: number;
         }>();
-        expectTypeOf(result.data).toEqualTypeOf<MethodResponse<typeof client, 'get', '/mismatched-errors'>>();
+        expectTypeOf(result.data).toEqualTypeOf<MethodResponse<typeof client, "get", "/mismatched-errors">>();
       } else {
         expectTypeOf(result.data).toBeUndefined();
         expectTypeOf(result.error).extract<{ code: number }>().toEqualTypeOf<{ code: number; message: string }>();