diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/body-response-text-plain/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/body-response-text-plain/client/client.gen.ts
index a439d2748..a2f252543 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/body-response-text-plain/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/body-response-text-plain/client/client.gen.ts
@@ -220,9 +220,9 @@ export const createClient = (config: Config = {}): Client => {
   const makeSseFn =
     (method: Uppercase<HttpMethod>) => async (options: RequestOptions) => {
       const { opts, url } = await beforeRequest(options);
+      const { body, ...sseOpts } = opts;
       return createSseClient({
-        ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        ...sseOpts,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/form-data/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/form-data/client/client.gen.ts
index a439d2748..a2f252543 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/form-data/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/form-data/client/client.gen.ts
@@ -220,9 +220,9 @@ export const createClient = (config: Config = {}): Client => {
   const makeSseFn =
     (method: Uppercase<HttpMethod>) => async (options: RequestOptions) => {
       const { opts, url } = await beforeRequest(options);
+      const { body, ...sseOpts } = opts;
       return createSseClient({
-        ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        ...sseOpts,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@angular/common/default-class/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@angular/common/default-class/client/client.gen.ts
index 1555ca230..ec02840e5 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@angular/common/default-class/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@angular/common/default-class/client/client.gen.ts
@@ -211,7 +211,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         url,
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@angular/common/default/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@angular/common/default/client/client.gen.ts
index 1555ca230..ec02840e5 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@angular/common/default/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@angular/common/default/client/client.gen.ts
@@ -211,7 +211,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         url,
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@hey-api/client-fetch/sdk-nested-classes-instance/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@hey-api/client-fetch/sdk-nested-classes-instance/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@hey-api/client-fetch/sdk-nested-classes-instance/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@hey-api/client-fetch/sdk-nested-classes-instance/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@hey-api/client-fetch/sdk-nested-classes/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@hey-api/client-fetch/sdk-nested-classes/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@hey-api/client-fetch/sdk-nested-classes/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@hey-api/client-fetch/sdk-nested-classes/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@hey-api/sdk/default/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@hey-api/sdk/default/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@hey-api/sdk/default/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@hey-api/sdk/default/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@hey-api/sdk/instance/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@hey-api/sdk/instance/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@hey-api/sdk/instance/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@hey-api/sdk/instance/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@hey-api/sdk/throwOnError/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@hey-api/sdk/throwOnError/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@hey-api/sdk/throwOnError/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@hey-api/sdk/throwOnError/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@hey-api/transformers/type-format-valibot/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@hey-api/transformers/type-format-valibot/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@hey-api/transformers/type-format-valibot/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@hey-api/transformers/type-format-valibot/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@hey-api/transformers/type-format-zod/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@hey-api/transformers/type-format-zod/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@hey-api/transformers/type-format-zod/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@hey-api/transformers/type-format-zod/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@hey-api/typescript/transforms-read-write-custom-name/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@hey-api/typescript/transforms-read-write-custom-name/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@hey-api/typescript/transforms-read-write-custom-name/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@hey-api/typescript/transforms-read-write-custom-name/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@hey-api/typescript/transforms-read-write-ignore/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@hey-api/typescript/transforms-read-write-ignore/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@hey-api/typescript/transforms-read-write-ignore/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@hey-api/typescript/transforms-read-write-ignore/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@pinia/colada/asClass/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@pinia/colada/asClass/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@pinia/colada/asClass/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@pinia/colada/asClass/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@pinia/colada/fetch/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@pinia/colada/fetch/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@pinia/colada/fetch/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@pinia/colada/fetch/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/angular-query-experimental/asClass/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/angular-query-experimental/asClass/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/angular-query-experimental/asClass/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/angular-query-experimental/asClass/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/angular-query-experimental/axios/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/angular-query-experimental/axios/client/client.gen.ts
index c8a60c6fa..8bf0745ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/angular-query-experimental/axios/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/angular-query-experimental/axios/client/client.gen.ts
@@ -124,7 +124,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as Record<string, string>,
         method,
         // @ts-expect-error
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/angular-query-experimental/fetch/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/angular-query-experimental/fetch/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/angular-query-experimental/fetch/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/angular-query-experimental/fetch/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/angular-query-experimental/name-builder/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/angular-query-experimental/name-builder/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/angular-query-experimental/name-builder/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/angular-query-experimental/name-builder/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/react-query/asClass/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/react-query/asClass/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/react-query/asClass/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/react-query/asClass/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/react-query/axios/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/react-query/axios/client/client.gen.ts
index c8a60c6fa..8bf0745ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/react-query/axios/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/react-query/axios/client/client.gen.ts
@@ -124,7 +124,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as Record<string, string>,
         method,
         // @ts-expect-error
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/react-query/fetch/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/react-query/fetch/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/react-query/fetch/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/react-query/fetch/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/react-query/name-builder/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/react-query/name-builder/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/react-query/name-builder/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/react-query/name-builder/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/solid-query/asClass/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/solid-query/asClass/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/solid-query/asClass/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/solid-query/asClass/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/solid-query/axios/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/solid-query/axios/client/client.gen.ts
index c8a60c6fa..8bf0745ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/solid-query/axios/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/solid-query/axios/client/client.gen.ts
@@ -124,7 +124,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as Record<string, string>,
         method,
         // @ts-expect-error
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/solid-query/fetch/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/solid-query/fetch/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/solid-query/fetch/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/solid-query/fetch/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/solid-query/name-builder/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/solid-query/name-builder/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/solid-query/name-builder/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/solid-query/name-builder/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/svelte-query/asClass/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/svelte-query/asClass/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/svelte-query/asClass/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/svelte-query/asClass/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/svelte-query/axios/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/svelte-query/axios/client/client.gen.ts
index c8a60c6fa..8bf0745ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/svelte-query/axios/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/svelte-query/axios/client/client.gen.ts
@@ -124,7 +124,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as Record<string, string>,
         method,
         // @ts-expect-error
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/svelte-query/fetch/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/svelte-query/fetch/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/svelte-query/fetch/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/svelte-query/fetch/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/svelte-query/name-builder/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/svelte-query/name-builder/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/svelte-query/name-builder/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/svelte-query/name-builder/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/vue-query/asClass/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/vue-query/asClass/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/vue-query/asClass/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/vue-query/asClass/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/vue-query/axios/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/vue-query/axios/client/client.gen.ts
index c8a60c6fa..8bf0745ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/vue-query/axios/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/vue-query/axios/client/client.gen.ts
@@ -124,7 +124,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as Record<string, string>,
         method,
         // @ts-expect-error
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/vue-query/fetch/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/vue-query/fetch/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/vue-query/fetch/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/vue-query/fetch/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/vue-query/name-builder/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/vue-query/name-builder/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/vue-query/name-builder/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/plugins/@tanstack/vue-query/name-builder/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/schema-unknown/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/schema-unknown/client/client.gen.ts
index a439d2748..a2f252543 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/schema-unknown/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/schema-unknown/client/client.gen.ts
@@ -220,9 +220,9 @@ export const createClient = (config: Config = {}): Client => {
   const makeSseFn =
     (method: Uppercase<HttpMethod>) => async (options: RequestOptions) => {
       const { opts, url } = await beforeRequest(options);
+      const { body, ...sseOpts } = opts;
       return createSseClient({
-        ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        ...sseOpts,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/security-api-key/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/security-api-key/client/client.gen.ts
index a439d2748..a2f252543 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/security-api-key/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/security-api-key/client/client.gen.ts
@@ -220,9 +220,9 @@ export const createClient = (config: Config = {}): Client => {
   const makeSseFn =
     (method: Uppercase<HttpMethod>) => async (options: RequestOptions) => {
       const { opts, url } = await beforeRequest(options);
+      const { body, ...sseOpts } = opts;
       return createSseClient({
-        ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        ...sseOpts,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/security-basic/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/security-basic/client/client.gen.ts
index a439d2748..a2f252543 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/security-basic/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/security-basic/client/client.gen.ts
@@ -220,9 +220,9 @@ export const createClient = (config: Config = {}): Client => {
   const makeSseFn =
     (method: Uppercase<HttpMethod>) => async (options: RequestOptions) => {
       const { opts, url } = await beforeRequest(options);
+      const { body, ...sseOpts } = opts;
       return createSseClient({
-        ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        ...sseOpts,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/security-false/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/security-false/client/client.gen.ts
index a439d2748..a2f252543 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/security-false/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/security-false/client/client.gen.ts
@@ -220,9 +220,9 @@ export const createClient = (config: Config = {}): Client => {
   const makeSseFn =
     (method: Uppercase<HttpMethod>) => async (options: RequestOptions) => {
       const { opts, url } = await beforeRequest(options);
+      const { body, ...sseOpts } = opts;
       return createSseClient({
-        ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        ...sseOpts,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/security-oauth2/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/security-oauth2/client/client.gen.ts
index a439d2748..a2f252543 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/security-oauth2/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/security-oauth2/client/client.gen.ts
@@ -220,9 +220,9 @@ export const createClient = (config: Config = {}): Client => {
   const makeSseFn =
     (method: Uppercase<HttpMethod>) => async (options: RequestOptions) => {
       const { opts, url } = await beforeRequest(options);
+      const { body, ...sseOpts } = opts;
       return createSseClient({
-        ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        ...sseOpts,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/servers-base-path/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/servers-base-path/client/client.gen.ts
index a439d2748..a2f252543 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/servers-base-path/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/servers-base-path/client/client.gen.ts
@@ -220,9 +220,9 @@ export const createClient = (config: Config = {}): Client => {
   const makeSseFn =
     (method: Uppercase<HttpMethod>) => async (options: RequestOptions) => {
       const { opts, url } = await beforeRequest(options);
+      const { body, ...sseOpts } = opts;
       return createSseClient({
-        ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        ...sseOpts,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/servers-host/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/servers-host/client/client.gen.ts
index a439d2748..a2f252543 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/servers-host/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/servers-host/client/client.gen.ts
@@ -220,9 +220,9 @@ export const createClient = (config: Config = {}): Client => {
   const makeSseFn =
     (method: Uppercase<HttpMethod>) => async (options: RequestOptions) => {
       const { opts, url } = await beforeRequest(options);
+      const { body, ...sseOpts } = opts;
       return createSseClient({
-        ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        ...sseOpts,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/servers/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/servers/client/client.gen.ts
index a439d2748..a2f252543 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/servers/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/servers/client/client.gen.ts
@@ -220,9 +220,9 @@ export const createClient = (config: Config = {}): Client => {
   const makeSseFn =
     (method: Uppercase<HttpMethod>) => async (options: RequestOptions) => {
       const { opts, url } = await beforeRequest(options);
+      const { body, ...sseOpts } = opts;
       return createSseClient({
-        ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        ...sseOpts,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/transforms-read-write/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/transforms-read-write/client/client.gen.ts
index a439d2748..a2f252543 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/transforms-read-write/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/2.0.x/transforms-read-write/client/client.gen.ts
@@ -220,9 +220,9 @@ export const createClient = (config: Config = {}): Client => {
   const makeSseFn =
     (method: Uppercase<HttpMethod>) => async (options: RequestOptions) => {
       const { opts, url } = await beforeRequest(options);
+      const { body, ...sseOpts } = opts;
       return createSseClient({
-        ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        ...sseOpts,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/body-response-text-plain/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/body-response-text-plain/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/body-response-text-plain/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/body-response-text-plain/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/content-types/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/content-types/client/client.gen.ts
index c8a60c6fa..8bf0745ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/content-types/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/content-types/client/client.gen.ts
@@ -124,7 +124,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as Record<string, string>,
         method,
         // @ts-expect-error
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/internal-name-conflict/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/internal-name-conflict/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/internal-name-conflict/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/internal-name-conflict/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/parameter-explode-false-axios/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/parameter-explode-false-axios/client/client.gen.ts
index c8a60c6fa..8bf0745ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/parameter-explode-false-axios/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/parameter-explode-false-axios/client/client.gen.ts
@@ -124,7 +124,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as Record<string, string>,
         method,
         // @ts-expect-error
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/parameter-explode-false/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/parameter-explode-false/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/parameter-explode-false/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/parameter-explode-false/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@angular/common/default-class/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@angular/common/default-class/client/client.gen.ts
index 1555ca230..ec02840e5 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@angular/common/default-class/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@angular/common/default-class/client/client.gen.ts
@@ -211,7 +211,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         url,
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@angular/common/default/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@angular/common/default/client/client.gen.ts
index 1555ca230..ec02840e5 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@angular/common/default/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@angular/common/default/client/client.gen.ts
@@ -211,7 +211,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         url,
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@hey-api/client-fetch/sdk-nested-classes-instance/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@hey-api/client-fetch/sdk-nested-classes-instance/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@hey-api/client-fetch/sdk-nested-classes-instance/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@hey-api/client-fetch/sdk-nested-classes-instance/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@hey-api/client-fetch/sdk-nested-classes/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@hey-api/client-fetch/sdk-nested-classes/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@hey-api/client-fetch/sdk-nested-classes/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@hey-api/client-fetch/sdk-nested-classes/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@hey-api/sdk/default/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@hey-api/sdk/default/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@hey-api/sdk/default/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@hey-api/sdk/default/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@hey-api/sdk/instance/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@hey-api/sdk/instance/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@hey-api/sdk/instance/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@hey-api/sdk/instance/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@hey-api/sdk/throwOnError/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@hey-api/sdk/throwOnError/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@hey-api/sdk/throwOnError/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@hey-api/sdk/throwOnError/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@hey-api/transformers/type-format-valibot/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@hey-api/transformers/type-format-valibot/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@hey-api/transformers/type-format-valibot/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@hey-api/transformers/type-format-valibot/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@hey-api/transformers/type-format-zod/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@hey-api/transformers/type-format-zod/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@hey-api/transformers/type-format-zod/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@hey-api/transformers/type-format-zod/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@hey-api/typescript/transforms-read-write-custom-name/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@hey-api/typescript/transforms-read-write-custom-name/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@hey-api/typescript/transforms-read-write-custom-name/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@hey-api/typescript/transforms-read-write-custom-name/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@hey-api/typescript/transforms-read-write-ignore/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@hey-api/typescript/transforms-read-write-ignore/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@hey-api/typescript/transforms-read-write-ignore/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@hey-api/typescript/transforms-read-write-ignore/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@pinia/colada/asClass/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@pinia/colada/asClass/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@pinia/colada/asClass/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@pinia/colada/asClass/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@pinia/colada/fetch/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@pinia/colada/fetch/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@pinia/colada/fetch/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@pinia/colada/fetch/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/angular-query-experimental/asClass/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/angular-query-experimental/asClass/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/angular-query-experimental/asClass/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/angular-query-experimental/asClass/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/angular-query-experimental/axios/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/angular-query-experimental/axios/client/client.gen.ts
index c8a60c6fa..8bf0745ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/angular-query-experimental/axios/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/angular-query-experimental/axios/client/client.gen.ts
@@ -124,7 +124,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as Record<string, string>,
         method,
         // @ts-expect-error
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/angular-query-experimental/fetch/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/angular-query-experimental/fetch/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/angular-query-experimental/fetch/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/angular-query-experimental/fetch/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/angular-query-experimental/name-builder/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/angular-query-experimental/name-builder/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/angular-query-experimental/name-builder/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/angular-query-experimental/name-builder/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/react-query/asClass/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/react-query/asClass/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/react-query/asClass/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/react-query/asClass/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/react-query/axios/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/react-query/axios/client/client.gen.ts
index c8a60c6fa..8bf0745ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/react-query/axios/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/react-query/axios/client/client.gen.ts
@@ -124,7 +124,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as Record<string, string>,
         method,
         // @ts-expect-error
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/react-query/fetch/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/react-query/fetch/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/react-query/fetch/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/react-query/fetch/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/react-query/name-builder/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/react-query/name-builder/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/react-query/name-builder/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/react-query/name-builder/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/solid-query/asClass/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/solid-query/asClass/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/solid-query/asClass/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/solid-query/asClass/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/solid-query/axios/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/solid-query/axios/client/client.gen.ts
index c8a60c6fa..8bf0745ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/solid-query/axios/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/solid-query/axios/client/client.gen.ts
@@ -124,7 +124,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as Record<string, string>,
         method,
         // @ts-expect-error
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/solid-query/fetch/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/solid-query/fetch/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/solid-query/fetch/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/solid-query/fetch/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/solid-query/name-builder/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/solid-query/name-builder/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/solid-query/name-builder/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/solid-query/name-builder/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/svelte-query/asClass/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/svelte-query/asClass/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/svelte-query/asClass/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/svelte-query/asClass/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/svelte-query/axios/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/svelte-query/axios/client/client.gen.ts
index c8a60c6fa..8bf0745ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/svelte-query/axios/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/svelte-query/axios/client/client.gen.ts
@@ -124,7 +124,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as Record<string, string>,
         method,
         // @ts-expect-error
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/svelte-query/fetch/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/svelte-query/fetch/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/svelte-query/fetch/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/svelte-query/fetch/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/svelte-query/name-builder/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/svelte-query/name-builder/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/svelte-query/name-builder/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/svelte-query/name-builder/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/vue-query/asClass/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/vue-query/asClass/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/vue-query/asClass/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/vue-query/asClass/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/vue-query/axios/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/vue-query/axios/client/client.gen.ts
index c8a60c6fa..8bf0745ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/vue-query/axios/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/vue-query/axios/client/client.gen.ts
@@ -124,7 +124,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as Record<string, string>,
         method,
         // @ts-expect-error
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/vue-query/fetch/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/vue-query/fetch/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/vue-query/fetch/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/vue-query/fetch/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/vue-query/name-builder/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/vue-query/name-builder/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/vue-query/name-builder/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/plugins/@tanstack/vue-query/name-builder/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/security-api-key/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/security-api-key/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/security-api-key/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/security-api-key/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/security-false/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/security-false/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/security-false/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/security-false/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/security-http-bearer/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/security-http-bearer/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/security-http-bearer/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/security-http-bearer/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/security-oauth2/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/security-oauth2/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/security-oauth2/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/security-oauth2/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/security-open-id-connect/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/security-open-id-connect/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/security-open-id-connect/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/security-open-id-connect/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/servers/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/servers/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/servers/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/servers/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/transformers-all-of/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/transformers-all-of/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/transformers-all-of/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/transformers-all-of/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/transformers-any-of-null/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/transformers-any-of-null/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/transformers-any-of-null/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/transformers-any-of-null/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/transformers-array/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/transformers-array/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/transformers-array/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/transformers-array/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/transforms-read-write/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/transforms-read-write/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/transforms-read-write/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.0.x/transforms-read-write/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/body-response-text-plain/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/body-response-text-plain/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/body-response-text-plain/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/body-response-text-plain/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-axios/base-url-false/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-axios/base-url-false/client/client.gen.ts
index c8a60c6fa..3308740e2 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-axios/base-url-false/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-axios/base-url-false/client/client.gen.ts
@@ -122,9 +122,9 @@ export const createClient = (config: Config = {}): Client => {
   const makeSseFn =
     (method: Uppercase<HttpMethod>) => async (options: RequestOptions) => {
       const { opts, url } = await beforeRequest(options);
+      const { body, ...sseOpts } = opts;
       return createSseClient({
-        ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        ...sseOpts,
         headers: opts.headers as Record<string, string>,
         method,
         // @ts-expect-error
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-axios/base-url-number/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-axios/base-url-number/client/client.gen.ts
index c8a60c6fa..3308740e2 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-axios/base-url-number/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-axios/base-url-number/client/client.gen.ts
@@ -122,9 +122,9 @@ export const createClient = (config: Config = {}): Client => {
   const makeSseFn =
     (method: Uppercase<HttpMethod>) => async (options: RequestOptions) => {
       const { opts, url } = await beforeRequest(options);
+      const { body, ...sseOpts } = opts;
       return createSseClient({
-        ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        ...sseOpts,
         headers: opts.headers as Record<string, string>,
         method,
         // @ts-expect-error
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-axios/base-url-strict/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-axios/base-url-strict/client/client.gen.ts
index c8a60c6fa..3308740e2 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-axios/base-url-strict/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-axios/base-url-strict/client/client.gen.ts
@@ -122,9 +122,9 @@ export const createClient = (config: Config = {}): Client => {
   const makeSseFn =
     (method: Uppercase<HttpMethod>) => async (options: RequestOptions) => {
       const { opts, url } = await beforeRequest(options);
+      const { body, ...sseOpts } = opts;
       return createSseClient({
-        ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        ...sseOpts,
         headers: opts.headers as Record<string, string>,
         method,
         // @ts-expect-error
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-axios/base-url-string/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-axios/base-url-string/client/client.gen.ts
index c8a60c6fa..3308740e2 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-axios/base-url-string/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-axios/base-url-string/client/client.gen.ts
@@ -122,9 +122,9 @@ export const createClient = (config: Config = {}): Client => {
   const makeSseFn =
     (method: Uppercase<HttpMethod>) => async (options: RequestOptions) => {
       const { opts, url } = await beforeRequest(options);
+      const { body, ...sseOpts } = opts;
       return createSseClient({
-        ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        ...sseOpts,
         headers: opts.headers as Record<string, string>,
         method,
         // @ts-expect-error
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-axios/clean-false/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-axios/clean-false/client/client.gen.ts
index c8a60c6fa..3308740e2 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-axios/clean-false/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-axios/clean-false/client/client.gen.ts
@@ -122,9 +122,9 @@ export const createClient = (config: Config = {}): Client => {
   const makeSseFn =
     (method: Uppercase<HttpMethod>) => async (options: RequestOptions) => {
       const { opts, url } = await beforeRequest(options);
+      const { body, ...sseOpts } = opts;
       return createSseClient({
-        ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        ...sseOpts,
         headers: opts.headers as Record<string, string>,
         method,
         // @ts-expect-error
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-axios/default/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-axios/default/client/client.gen.ts
index c8a60c6fa..3308740e2 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-axios/default/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-axios/default/client/client.gen.ts
@@ -122,9 +122,9 @@ export const createClient = (config: Config = {}): Client => {
   const makeSseFn =
     (method: Uppercase<HttpMethod>) => async (options: RequestOptions) => {
       const { opts, url } = await beforeRequest(options);
+      const { body, ...sseOpts } = opts;
       return createSseClient({
-        ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        ...sseOpts,
         headers: opts.headers as Record<string, string>,
         method,
         // @ts-expect-error
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-axios/sdk-client-optional/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-axios/sdk-client-optional/client/client.gen.ts
index c8a60c6fa..3308740e2 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-axios/sdk-client-optional/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-axios/sdk-client-optional/client/client.gen.ts
@@ -122,9 +122,9 @@ export const createClient = (config: Config = {}): Client => {
   const makeSseFn =
     (method: Uppercase<HttpMethod>) => async (options: RequestOptions) => {
       const { opts, url } = await beforeRequest(options);
+      const { body, ...sseOpts } = opts;
       return createSseClient({
-        ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        ...sseOpts,
         headers: opts.headers as Record<string, string>,
         method,
         // @ts-expect-error
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-axios/sdk-client-required/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-axios/sdk-client-required/client/client.gen.ts
index c8a60c6fa..3308740e2 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-axios/sdk-client-required/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-axios/sdk-client-required/client/client.gen.ts
@@ -122,9 +122,9 @@ export const createClient = (config: Config = {}): Client => {
   const makeSseFn =
     (method: Uppercase<HttpMethod>) => async (options: RequestOptions) => {
       const { opts, url } = await beforeRequest(options);
+      const { body, ...sseOpts } = opts;
       return createSseClient({
-        ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        ...sseOpts,
         headers: opts.headers as Record<string, string>,
         method,
         // @ts-expect-error
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-axios/tsconfig-nodenext-sdk/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-axios/tsconfig-nodenext-sdk/client/client.gen.ts
index 17fc6d73c..ec277a4a2 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-axios/tsconfig-nodenext-sdk/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-axios/tsconfig-nodenext-sdk/client/client.gen.ts
@@ -122,9 +122,9 @@ export const createClient = (config: Config = {}): Client => {
   const makeSseFn =
     (method: Uppercase<HttpMethod>) => async (options: RequestOptions) => {
       const { opts, url } = await beforeRequest(options);
+      const { body, ...sseOpts } = opts;
       return createSseClient({
-        ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        ...sseOpts,
         headers: opts.headers as Record<string, string>,
         method,
         // @ts-expect-error
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-fetch/base-url-false/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-fetch/base-url-false/client/client.gen.ts
index a439d2748..a2f252543 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-fetch/base-url-false/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-fetch/base-url-false/client/client.gen.ts
@@ -220,9 +220,9 @@ export const createClient = (config: Config = {}): Client => {
   const makeSseFn =
     (method: Uppercase<HttpMethod>) => async (options: RequestOptions) => {
       const { opts, url } = await beforeRequest(options);
+      const { body, ...sseOpts } = opts;
       return createSseClient({
-        ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        ...sseOpts,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-fetch/base-url-number/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-fetch/base-url-number/client/client.gen.ts
index a439d2748..a2f252543 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-fetch/base-url-number/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-fetch/base-url-number/client/client.gen.ts
@@ -220,9 +220,9 @@ export const createClient = (config: Config = {}): Client => {
   const makeSseFn =
     (method: Uppercase<HttpMethod>) => async (options: RequestOptions) => {
       const { opts, url } = await beforeRequest(options);
+      const { body, ...sseOpts } = opts;
       return createSseClient({
-        ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        ...sseOpts,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-fetch/base-url-strict/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-fetch/base-url-strict/client/client.gen.ts
index a439d2748..a2f252543 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-fetch/base-url-strict/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-fetch/base-url-strict/client/client.gen.ts
@@ -220,9 +220,9 @@ export const createClient = (config: Config = {}): Client => {
   const makeSseFn =
     (method: Uppercase<HttpMethod>) => async (options: RequestOptions) => {
       const { opts, url } = await beforeRequest(options);
+      const { body, ...sseOpts } = opts;
       return createSseClient({
-        ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        ...sseOpts,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-fetch/base-url-string/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-fetch/base-url-string/client/client.gen.ts
index a439d2748..a2f252543 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-fetch/base-url-string/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-fetch/base-url-string/client/client.gen.ts
@@ -220,9 +220,9 @@ export const createClient = (config: Config = {}): Client => {
   const makeSseFn =
     (method: Uppercase<HttpMethod>) => async (options: RequestOptions) => {
       const { opts, url } = await beforeRequest(options);
+      const { body, ...sseOpts } = opts;
       return createSseClient({
-        ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        ...sseOpts,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-fetch/clean-false/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-fetch/clean-false/client/client.gen.ts
index a439d2748..a2f252543 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-fetch/clean-false/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-fetch/clean-false/client/client.gen.ts
@@ -220,9 +220,9 @@ export const createClient = (config: Config = {}): Client => {
   const makeSseFn =
     (method: Uppercase<HttpMethod>) => async (options: RequestOptions) => {
       const { opts, url } = await beforeRequest(options);
+      const { body, ...sseOpts } = opts;
       return createSseClient({
-        ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        ...sseOpts,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-fetch/default/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-fetch/default/client/client.gen.ts
index a439d2748..a2f252543 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-fetch/default/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-fetch/default/client/client.gen.ts
@@ -220,9 +220,9 @@ export const createClient = (config: Config = {}): Client => {
   const makeSseFn =
     (method: Uppercase<HttpMethod>) => async (options: RequestOptions) => {
       const { opts, url } = await beforeRequest(options);
+      const { body, ...sseOpts } = opts;
       return createSseClient({
-        ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        ...sseOpts,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-fetch/sdk-client-optional/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-fetch/sdk-client-optional/client/client.gen.ts
index a439d2748..a2f252543 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-fetch/sdk-client-optional/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-fetch/sdk-client-optional/client/client.gen.ts
@@ -220,9 +220,9 @@ export const createClient = (config: Config = {}): Client => {
   const makeSseFn =
     (method: Uppercase<HttpMethod>) => async (options: RequestOptions) => {
       const { opts, url } = await beforeRequest(options);
+      const { body, ...sseOpts } = opts;
       return createSseClient({
-        ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        ...sseOpts,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-fetch/sdk-client-required/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-fetch/sdk-client-required/client/client.gen.ts
index a439d2748..a2f252543 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-fetch/sdk-client-required/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-fetch/sdk-client-required/client/client.gen.ts
@@ -220,9 +220,9 @@ export const createClient = (config: Config = {}): Client => {
   const makeSseFn =
     (method: Uppercase<HttpMethod>) => async (options: RequestOptions) => {
       const { opts, url } = await beforeRequest(options);
+      const { body, ...sseOpts } = opts;
       return createSseClient({
-        ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        ...sseOpts,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-fetch/tsconfig-nodenext-sdk/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-fetch/tsconfig-nodenext-sdk/client/client.gen.ts
index 67961302b..cae80040e 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-fetch/tsconfig-nodenext-sdk/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-fetch/tsconfig-nodenext-sdk/client/client.gen.ts
@@ -220,9 +220,9 @@ export const createClient = (config: Config = {}): Client => {
   const makeSseFn =
     (method: Uppercase<HttpMethod>) => async (options: RequestOptions) => {
       const { opts, url } = await beforeRequest(options);
+      const { body, ...sseOpts } = opts;
       return createSseClient({
-        ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        ...sseOpts,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-next/base-url-false/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-next/base-url-false/client/client.gen.ts
index 53d0433b9..bcad1abf2 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-next/base-url-false/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-next/base-url-false/client/client.gen.ts
@@ -208,9 +208,9 @@ export const createClient = (config: Config = {}): Client => {
   const makeSseFn =
     (method: Uppercase<HttpMethod>) => async (options: RequestOptions) => {
       const { opts, url } = await beforeRequest(options);
+      const { body, ...sseOpts } = opts;
       return createSseClient({
-        ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        ...sseOpts,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-next/base-url-number/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-next/base-url-number/client/client.gen.ts
index 53d0433b9..bcad1abf2 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-next/base-url-number/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-next/base-url-number/client/client.gen.ts
@@ -208,9 +208,9 @@ export const createClient = (config: Config = {}): Client => {
   const makeSseFn =
     (method: Uppercase<HttpMethod>) => async (options: RequestOptions) => {
       const { opts, url } = await beforeRequest(options);
+      const { body, ...sseOpts } = opts;
       return createSseClient({
-        ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        ...sseOpts,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-next/base-url-strict/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-next/base-url-strict/client/client.gen.ts
index 53d0433b9..bcad1abf2 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-next/base-url-strict/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-next/base-url-strict/client/client.gen.ts
@@ -208,9 +208,9 @@ export const createClient = (config: Config = {}): Client => {
   const makeSseFn =
     (method: Uppercase<HttpMethod>) => async (options: RequestOptions) => {
       const { opts, url } = await beforeRequest(options);
+      const { body, ...sseOpts } = opts;
       return createSseClient({
-        ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        ...sseOpts,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-next/base-url-string/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-next/base-url-string/client/client.gen.ts
index 53d0433b9..bcad1abf2 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-next/base-url-string/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-next/base-url-string/client/client.gen.ts
@@ -208,9 +208,9 @@ export const createClient = (config: Config = {}): Client => {
   const makeSseFn =
     (method: Uppercase<HttpMethod>) => async (options: RequestOptions) => {
       const { opts, url } = await beforeRequest(options);
+      const { body, ...sseOpts } = opts;
       return createSseClient({
-        ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        ...sseOpts,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-next/clean-false/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-next/clean-false/client/client.gen.ts
index 53d0433b9..bcad1abf2 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-next/clean-false/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-next/clean-false/client/client.gen.ts
@@ -208,9 +208,9 @@ export const createClient = (config: Config = {}): Client => {
   const makeSseFn =
     (method: Uppercase<HttpMethod>) => async (options: RequestOptions) => {
       const { opts, url } = await beforeRequest(options);
+      const { body, ...sseOpts } = opts;
       return createSseClient({
-        ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        ...sseOpts,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-next/default/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-next/default/client/client.gen.ts
index 53d0433b9..bcad1abf2 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-next/default/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-next/default/client/client.gen.ts
@@ -208,9 +208,9 @@ export const createClient = (config: Config = {}): Client => {
   const makeSseFn =
     (method: Uppercase<HttpMethod>) => async (options: RequestOptions) => {
       const { opts, url } = await beforeRequest(options);
+      const { body, ...sseOpts } = opts;
       return createSseClient({
-        ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        ...sseOpts,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-next/sdk-client-optional/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-next/sdk-client-optional/client/client.gen.ts
index 53d0433b9..bcad1abf2 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-next/sdk-client-optional/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-next/sdk-client-optional/client/client.gen.ts
@@ -208,9 +208,9 @@ export const createClient = (config: Config = {}): Client => {
   const makeSseFn =
     (method: Uppercase<HttpMethod>) => async (options: RequestOptions) => {
       const { opts, url } = await beforeRequest(options);
+      const { body, ...sseOpts } = opts;
       return createSseClient({
-        ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        ...sseOpts,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-next/sdk-client-required/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-next/sdk-client-required/client/client.gen.ts
index 53d0433b9..bcad1abf2 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-next/sdk-client-required/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-next/sdk-client-required/client/client.gen.ts
@@ -208,9 +208,9 @@ export const createClient = (config: Config = {}): Client => {
   const makeSseFn =
     (method: Uppercase<HttpMethod>) => async (options: RequestOptions) => {
       const { opts, url } = await beforeRequest(options);
+      const { body, ...sseOpts } = opts;
       return createSseClient({
-        ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        ...sseOpts,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-next/tsconfig-nodenext-sdk/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-next/tsconfig-nodenext-sdk/client/client.gen.ts
index 12468638a..07742b92e 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-next/tsconfig-nodenext-sdk/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-next/tsconfig-nodenext-sdk/client/client.gen.ts
@@ -208,9 +208,9 @@ export const createClient = (config: Config = {}): Client => {
   const makeSseFn =
     (method: Uppercase<HttpMethod>) => async (options: RequestOptions) => {
       const { opts, url } = await beforeRequest(options);
+      const { body, ...sseOpts } = opts;
       return createSseClient({
-        ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        ...sseOpts,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-nuxt/base-url-false/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-nuxt/base-url-false/client/client.gen.ts
index 3dbbcd126..0ec9e73a5 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-nuxt/base-url-false/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-nuxt/base-url-false/client/client.gen.ts
@@ -190,9 +190,10 @@ export const createClient = (config: Config = {}): Client => {
   const makeSseFn =
     (method: Uppercase<HttpMethod>) => async (options: RequestOptions) => {
       const { opts, url } = await beforeRequest(options);
+      const unwrappedOpts = unwrapRefs(opts);
+      const { body, ...sseOpts } = unwrappedOpts;
       return createSseClient({
-        ...unwrapRefs(opts),
-        body: opts.body as BodyInit | null | undefined,
+        ...sseOpts,
         method,
         onRequest: undefined,
         signal: unwrapRefs(opts.signal) as AbortSignal,
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-nuxt/base-url-number/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-nuxt/base-url-number/client/client.gen.ts
index 3dbbcd126..0ec9e73a5 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-nuxt/base-url-number/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-nuxt/base-url-number/client/client.gen.ts
@@ -190,9 +190,10 @@ export const createClient = (config: Config = {}): Client => {
   const makeSseFn =
     (method: Uppercase<HttpMethod>) => async (options: RequestOptions) => {
       const { opts, url } = await beforeRequest(options);
+      const unwrappedOpts = unwrapRefs(opts);
+      const { body, ...sseOpts } = unwrappedOpts;
       return createSseClient({
-        ...unwrapRefs(opts),
-        body: opts.body as BodyInit | null | undefined,
+        ...sseOpts,
         method,
         onRequest: undefined,
         signal: unwrapRefs(opts.signal) as AbortSignal,
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-nuxt/base-url-strict/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-nuxt/base-url-strict/client/client.gen.ts
index 3dbbcd126..0ec9e73a5 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-nuxt/base-url-strict/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-nuxt/base-url-strict/client/client.gen.ts
@@ -190,9 +190,10 @@ export const createClient = (config: Config = {}): Client => {
   const makeSseFn =
     (method: Uppercase<HttpMethod>) => async (options: RequestOptions) => {
       const { opts, url } = await beforeRequest(options);
+      const unwrappedOpts = unwrapRefs(opts);
+      const { body, ...sseOpts } = unwrappedOpts;
       return createSseClient({
-        ...unwrapRefs(opts),
-        body: opts.body as BodyInit | null | undefined,
+        ...sseOpts,
         method,
         onRequest: undefined,
         signal: unwrapRefs(opts.signal) as AbortSignal,
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-nuxt/base-url-string/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-nuxt/base-url-string/client/client.gen.ts
index 3dbbcd126..0ec9e73a5 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-nuxt/base-url-string/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-nuxt/base-url-string/client/client.gen.ts
@@ -190,9 +190,10 @@ export const createClient = (config: Config = {}): Client => {
   const makeSseFn =
     (method: Uppercase<HttpMethod>) => async (options: RequestOptions) => {
       const { opts, url } = await beforeRequest(options);
+      const unwrappedOpts = unwrapRefs(opts);
+      const { body, ...sseOpts } = unwrappedOpts;
       return createSseClient({
-        ...unwrapRefs(opts),
-        body: opts.body as BodyInit | null | undefined,
+        ...sseOpts,
         method,
         onRequest: undefined,
         signal: unwrapRefs(opts.signal) as AbortSignal,
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-nuxt/clean-false/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-nuxt/clean-false/client/client.gen.ts
index 3dbbcd126..0ec9e73a5 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-nuxt/clean-false/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-nuxt/clean-false/client/client.gen.ts
@@ -190,9 +190,10 @@ export const createClient = (config: Config = {}): Client => {
   const makeSseFn =
     (method: Uppercase<HttpMethod>) => async (options: RequestOptions) => {
       const { opts, url } = await beforeRequest(options);
+      const unwrappedOpts = unwrapRefs(opts);
+      const { body, ...sseOpts } = unwrappedOpts;
       return createSseClient({
-        ...unwrapRefs(opts),
-        body: opts.body as BodyInit | null | undefined,
+        ...sseOpts,
         method,
         onRequest: undefined,
         signal: unwrapRefs(opts.signal) as AbortSignal,
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-nuxt/default/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-nuxt/default/client/client.gen.ts
index 3dbbcd126..0ec9e73a5 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-nuxt/default/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-nuxt/default/client/client.gen.ts
@@ -190,9 +190,10 @@ export const createClient = (config: Config = {}): Client => {
   const makeSseFn =
     (method: Uppercase<HttpMethod>) => async (options: RequestOptions) => {
       const { opts, url } = await beforeRequest(options);
+      const unwrappedOpts = unwrapRefs(opts);
+      const { body, ...sseOpts } = unwrappedOpts;
       return createSseClient({
-        ...unwrapRefs(opts),
-        body: opts.body as BodyInit | null | undefined,
+        ...sseOpts,
         method,
         onRequest: undefined,
         signal: unwrapRefs(opts.signal) as AbortSignal,
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-nuxt/sdk-client-optional/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-nuxt/sdk-client-optional/client/client.gen.ts
index 3dbbcd126..0ec9e73a5 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-nuxt/sdk-client-optional/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-nuxt/sdk-client-optional/client/client.gen.ts
@@ -190,9 +190,10 @@ export const createClient = (config: Config = {}): Client => {
   const makeSseFn =
     (method: Uppercase<HttpMethod>) => async (options: RequestOptions) => {
       const { opts, url } = await beforeRequest(options);
+      const unwrappedOpts = unwrapRefs(opts);
+      const { body, ...sseOpts } = unwrappedOpts;
       return createSseClient({
-        ...unwrapRefs(opts),
-        body: opts.body as BodyInit | null | undefined,
+        ...sseOpts,
         method,
         onRequest: undefined,
         signal: unwrapRefs(opts.signal) as AbortSignal,
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-nuxt/sdk-client-required/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-nuxt/sdk-client-required/client/client.gen.ts
index 3dbbcd126..0ec9e73a5 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-nuxt/sdk-client-required/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-nuxt/sdk-client-required/client/client.gen.ts
@@ -190,9 +190,10 @@ export const createClient = (config: Config = {}): Client => {
   const makeSseFn =
     (method: Uppercase<HttpMethod>) => async (options: RequestOptions) => {
       const { opts, url } = await beforeRequest(options);
+      const unwrappedOpts = unwrapRefs(opts);
+      const { body, ...sseOpts } = unwrappedOpts;
       return createSseClient({
-        ...unwrapRefs(opts),
-        body: opts.body as BodyInit | null | undefined,
+        ...sseOpts,
         method,
         onRequest: undefined,
         signal: unwrapRefs(opts.signal) as AbortSignal,
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-nuxt/tsconfig-nodenext-sdk/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-nuxt/tsconfig-nodenext-sdk/client/client.gen.ts
index 5bb268ce4..bc204c5fb 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-nuxt/tsconfig-nodenext-sdk/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/clients/@hey-api/client-nuxt/tsconfig-nodenext-sdk/client/client.gen.ts
@@ -190,9 +190,10 @@ export const createClient = (config: Config = {}): Client => {
   const makeSseFn =
     (method: Uppercase<HttpMethod>) => async (options: RequestOptions) => {
       const { opts, url } = await beforeRequest(options);
+      const unwrappedOpts = unwrapRefs(opts);
+      const { body, ...sseOpts } = unwrappedOpts;
       return createSseClient({
-        ...unwrapRefs(opts),
-        body: opts.body as BodyInit | null | undefined,
+        ...sseOpts,
         method,
         onRequest: undefined,
         signal: unwrapRefs(opts.signal) as AbortSignal,
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/content-types/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/content-types/client/client.gen.ts
index c8a60c6fa..8bf0745ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/content-types/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/content-types/client/client.gen.ts
@@ -124,7 +124,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as Record<string, string>,
         method,
         // @ts-expect-error
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/headers/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/headers/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/headers/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/headers/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/internal-name-conflict/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/internal-name-conflict/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/internal-name-conflict/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/internal-name-conflict/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/pagination-ref/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/pagination-ref/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/pagination-ref/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/pagination-ref/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/parameter-explode-false-axios/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/parameter-explode-false-axios/client/client.gen.ts
index c8a60c6fa..8bf0745ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/parameter-explode-false-axios/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/parameter-explode-false-axios/client/client.gen.ts
@@ -124,7 +124,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as Record<string, string>,
         method,
         // @ts-expect-error
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/parameter-explode-false/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/parameter-explode-false/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/parameter-explode-false/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/parameter-explode-false/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@angular/common/default-class/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@angular/common/default-class/client/client.gen.ts
index 1555ca230..ec02840e5 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@angular/common/default-class/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@angular/common/default-class/client/client.gen.ts
@@ -211,7 +211,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         url,
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@angular/common/default/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@angular/common/default/client/client.gen.ts
index 1555ca230..ec02840e5 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@angular/common/default/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@angular/common/default/client/client.gen.ts
@@ -211,7 +211,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         url,
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@hey-api/client-fetch/sdk-nested-classes-instance/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@hey-api/client-fetch/sdk-nested-classes-instance/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@hey-api/client-fetch/sdk-nested-classes-instance/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@hey-api/client-fetch/sdk-nested-classes-instance/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@hey-api/client-fetch/sdk-nested-classes/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@hey-api/client-fetch/sdk-nested-classes/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@hey-api/client-fetch/sdk-nested-classes/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@hey-api/client-fetch/sdk-nested-classes/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@hey-api/sdk/default/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@hey-api/sdk/default/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@hey-api/sdk/default/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@hey-api/sdk/default/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@hey-api/sdk/instance/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@hey-api/sdk/instance/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@hey-api/sdk/instance/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@hey-api/sdk/instance/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@hey-api/sdk/throwOnError/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@hey-api/sdk/throwOnError/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@hey-api/sdk/throwOnError/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@hey-api/sdk/throwOnError/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@hey-api/transformers/type-format-valibot/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@hey-api/transformers/type-format-valibot/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@hey-api/transformers/type-format-valibot/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@hey-api/transformers/type-format-valibot/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@hey-api/transformers/type-format-zod/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@hey-api/transformers/type-format-zod/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@hey-api/transformers/type-format-zod/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@hey-api/transformers/type-format-zod/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@hey-api/typescript/transforms-read-write-custom-name/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@hey-api/typescript/transforms-read-write-custom-name/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@hey-api/typescript/transforms-read-write-custom-name/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@hey-api/typescript/transforms-read-write-custom-name/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@hey-api/typescript/transforms-read-write-ignore/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@hey-api/typescript/transforms-read-write-ignore/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@hey-api/typescript/transforms-read-write-ignore/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@hey-api/typescript/transforms-read-write-ignore/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@pinia/colada/asClass/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@pinia/colada/asClass/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@pinia/colada/asClass/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@pinia/colada/asClass/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@pinia/colada/fetch/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@pinia/colada/fetch/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@pinia/colada/fetch/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@pinia/colada/fetch/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/angular-query-experimental/asClass/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/angular-query-experimental/asClass/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/angular-query-experimental/asClass/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/angular-query-experimental/asClass/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/angular-query-experimental/axios/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/angular-query-experimental/axios/client/client.gen.ts
index c8a60c6fa..8bf0745ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/angular-query-experimental/axios/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/angular-query-experimental/axios/client/client.gen.ts
@@ -124,7 +124,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as Record<string, string>,
         method,
         // @ts-expect-error
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/angular-query-experimental/fetch/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/angular-query-experimental/fetch/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/angular-query-experimental/fetch/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/angular-query-experimental/fetch/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/angular-query-experimental/name-builder/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/angular-query-experimental/name-builder/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/angular-query-experimental/name-builder/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/angular-query-experimental/name-builder/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/react-query/asClass/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/react-query/asClass/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/react-query/asClass/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/react-query/asClass/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/react-query/axios/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/react-query/axios/client/client.gen.ts
index c8a60c6fa..8bf0745ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/react-query/axios/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/react-query/axios/client/client.gen.ts
@@ -124,7 +124,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as Record<string, string>,
         method,
         // @ts-expect-error
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/react-query/fetch/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/react-query/fetch/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/react-query/fetch/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/react-query/fetch/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/react-query/name-builder/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/react-query/name-builder/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/react-query/name-builder/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/react-query/name-builder/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/solid-query/asClass/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/solid-query/asClass/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/solid-query/asClass/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/solid-query/asClass/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/solid-query/axios/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/solid-query/axios/client/client.gen.ts
index c8a60c6fa..8bf0745ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/solid-query/axios/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/solid-query/axios/client/client.gen.ts
@@ -124,7 +124,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as Record<string, string>,
         method,
         // @ts-expect-error
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/solid-query/fetch/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/solid-query/fetch/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/solid-query/fetch/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/solid-query/fetch/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/solid-query/name-builder/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/solid-query/name-builder/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/solid-query/name-builder/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/solid-query/name-builder/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/svelte-query/asClass/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/svelte-query/asClass/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/svelte-query/asClass/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/svelte-query/asClass/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/svelte-query/axios/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/svelte-query/axios/client/client.gen.ts
index c8a60c6fa..8bf0745ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/svelte-query/axios/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/svelte-query/axios/client/client.gen.ts
@@ -124,7 +124,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as Record<string, string>,
         method,
         // @ts-expect-error
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/svelte-query/fetch/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/svelte-query/fetch/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/svelte-query/fetch/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/svelte-query/fetch/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/svelte-query/name-builder/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/svelte-query/name-builder/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/svelte-query/name-builder/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/svelte-query/name-builder/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/vue-query/asClass/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/vue-query/asClass/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/vue-query/asClass/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/vue-query/asClass/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/vue-query/axios/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/vue-query/axios/client/client.gen.ts
index c8a60c6fa..8bf0745ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/vue-query/axios/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/vue-query/axios/client/client.gen.ts
@@ -124,7 +124,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as Record<string, string>,
         method,
         // @ts-expect-error
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/vue-query/fetch/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/vue-query/fetch/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/vue-query/fetch/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/vue-query/fetch/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/vue-query/name-builder/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/vue-query/name-builder/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/vue-query/name-builder/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/plugins/@tanstack/vue-query/name-builder/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/security-api-key/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/security-api-key/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/security-api-key/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/security-api-key/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/security-false/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/security-false/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/security-false/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/security-false/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/security-http-bearer/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/security-http-bearer/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/security-http-bearer/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/security-http-bearer/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/security-oauth2/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/security-oauth2/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/security-oauth2/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/security-oauth2/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/security-open-id-connect/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/security-open-id-connect/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/security-open-id-connect/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/security-open-id-connect/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/servers/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/servers/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/servers/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/servers/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/sse-angular/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/sse-angular/client/client.gen.ts
index 1555ca230..ec02840e5 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/sse-angular/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/sse-angular/client/client.gen.ts
@@ -211,7 +211,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         url,
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/sse-axios/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/sse-axios/client/client.gen.ts
index c8a60c6fa..8bf0745ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/sse-axios/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/sse-axios/client/client.gen.ts
@@ -124,7 +124,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as Record<string, string>,
         method,
         // @ts-expect-error
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/sse-fetch/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/sse-fetch/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/sse-fetch/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/sse-fetch/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/sse-next/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/sse-next/client/client.gen.ts
index 53d0433b9..86e2201f9 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/sse-next/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/sse-next/client/client.gen.ts
@@ -210,7 +210,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/sse-nuxt/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/sse-nuxt/client/client.gen.ts
index 3dbbcd126..c7116afdf 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/sse-nuxt/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/sse-nuxt/client/client.gen.ts
@@ -192,7 +192,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...unwrapRefs(opts),
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         method,
         onRequest: undefined,
         signal: unwrapRefs(opts.signal) as AbortSignal,
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/transformers-all-of/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/transformers-all-of/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/transformers-all-of/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/transformers-all-of/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/transformers-any-of-null/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/transformers-any-of-null/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/transformers-any-of-null/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/transformers-any-of-null/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/transformers-array/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/transformers-array/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/transformers-array/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/transformers-array/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/transforms-read-write/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/transforms-read-write/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/transforms-read-write/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/transforms-read-write/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/plugins/@tanstack/meta/client/client.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/plugins/@tanstack/meta/client/client.gen.ts
index a439d2748..a7de753ab 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/plugins/@tanstack/meta/client/client.gen.ts
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/plugins/@tanstack/meta/client/client.gen.ts
@@ -222,7 +222,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as any,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/test/generated/v3_no_index/client/client.gen.ts.snap b/packages/openapi-ts-tests/main/test/__snapshots__/test/generated/v3_no_index/client/client.gen.ts.snap
index a439d2748..ce7fa7c6f 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/test/generated/v3_no_index/client/client.gen.ts.snap
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/test/generated/v3_no_index/client/client.gen.ts.snap
@@ -6,6 +6,7 @@ import { getValidRequestBody } from '../core/utils.gen';
 import type {
   Client,
   Config,
+  RequestBody,
   RequestOptions,
   ResolvedRequestOptions,
 } from './types.gen';
@@ -222,7 +223,7 @@ export const createClient = (config: Config = {}): Client => {
       const { opts, url } = await beforeRequest(options);
       return createSseClient({
         ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        body: opts.body as RequestBody,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/test/generated/v3_no_index/client/types.gen.ts.snap b/packages/openapi-ts-tests/main/test/__snapshots__/test/generated/v3_no_index/client/types.gen.ts.snap
index 1a005b51e..dd0339265 100644
--- a/packages/openapi-ts-tests/main/test/__snapshots__/test/generated/v3_no_index/client/types.gen.ts.snap
+++ b/packages/openapi-ts-tests/main/test/__snapshots__/test/generated/v3_no_index/client/types.gen.ts.snap
@@ -11,6 +11,19 @@ import type {
 } from '../core/types.gen';
 import type { Middleware } from './utils.gen';
 
+/**
+ * Compatible body type for requests that doesn't depend on DOM types.
+ * Equivalent to the standard BodyInit type but without DOM-specific types
+ * like Blob, FormData, or ReadableStream that require DOM lib in TypeScript.
+ */
+export type RequestBody =
+  | string
+  | ArrayBuffer
+  | ArrayBufferView
+  | URLSearchParams
+  | null
+  | undefined;
+
 export type ResponseStyle = 'data' | 'fields';
 
 export interface Config<T extends ClientOptions = ClientOptions>
diff --git a/packages/openapi-ts/src/plugins/@hey-api/client-angular/bundle/client.ts b/packages/openapi-ts/src/plugins/@hey-api/client-angular/bundle/client.ts
index fd34020b6..4d9ea1b44 100644
--- a/packages/openapi-ts/src/plugins/@hey-api/client-angular/bundle/client.ts
+++ b/packages/openapi-ts/src/plugins/@hey-api/client-angular/bundle/client.ts
@@ -207,9 +207,9 @@ export const createClient = (config: Config = {}): Client => {
   const makeSseFn =
     (method: Uppercase<HttpMethod>) => async (options: RequestOptions) => {
       const { opts, url } = await beforeRequest(options);
+      const { body, ...sseOpts } = opts;
       return createSseClient({
-        ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        ...sseOpts,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         url,
diff --git a/packages/openapi-ts/src/plugins/@hey-api/client-axios/bundle/client.ts b/packages/openapi-ts/src/plugins/@hey-api/client-axios/bundle/client.ts
index fb7e69a3a..1a1f46feb 100644
--- a/packages/openapi-ts/src/plugins/@hey-api/client-axios/bundle/client.ts
+++ b/packages/openapi-ts/src/plugins/@hey-api/client-axios/bundle/client.ts
@@ -120,9 +120,9 @@ export const createClient = (config: Config = {}): Client => {
   const makeSseFn =
     (method: Uppercase<HttpMethod>) => async (options: RequestOptions) => {
       const { opts, url } = await beforeRequest(options);
+      const { body, ...sseOpts } = opts;
       return createSseClient({
-        ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        ...sseOpts,
         headers: opts.headers as Record<string, string>,
         method,
         // @ts-expect-error
diff --git a/packages/openapi-ts/src/plugins/@hey-api/client-fetch/bundle/client.ts b/packages/openapi-ts/src/plugins/@hey-api/client-fetch/bundle/client.ts
index b4932899a..282f139de 100644
--- a/packages/openapi-ts/src/plugins/@hey-api/client-fetch/bundle/client.ts
+++ b/packages/openapi-ts/src/plugins/@hey-api/client-fetch/bundle/client.ts
@@ -218,9 +218,9 @@ export const createClient = (config: Config = {}): Client => {
   const makeSseFn =
     (method: Uppercase<HttpMethod>) => async (options: RequestOptions) => {
       const { opts, url } = await beforeRequest(options);
+      const { body, ...sseOpts } = opts;
       return createSseClient({
-        ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        ...sseOpts,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts/src/plugins/@hey-api/client-next/bundle/client.ts b/packages/openapi-ts/src/plugins/@hey-api/client-next/bundle/client.ts
index e3fb833f8..eeae5be7b 100644
--- a/packages/openapi-ts/src/plugins/@hey-api/client-next/bundle/client.ts
+++ b/packages/openapi-ts/src/plugins/@hey-api/client-next/bundle/client.ts
@@ -206,9 +206,9 @@ export const createClient = (config: Config = {}): Client => {
   const makeSseFn =
     (method: Uppercase<HttpMethod>) => async (options: RequestOptions) => {
       const { opts, url } = await beforeRequest(options);
+      const { body, ...sseOpts } = opts;
       return createSseClient({
-        ...opts,
-        body: opts.body as BodyInit | null | undefined,
+        ...sseOpts,
         headers: opts.headers as unknown as Record<string, string>,
         method,
         onRequest: async (url, init) => {
diff --git a/packages/openapi-ts/src/plugins/@hey-api/client-nuxt/bundle/client.ts b/packages/openapi-ts/src/plugins/@hey-api/client-nuxt/bundle/client.ts
index 432ffbd40..eedaa1cab 100644
--- a/packages/openapi-ts/src/plugins/@hey-api/client-nuxt/bundle/client.ts
+++ b/packages/openapi-ts/src/plugins/@hey-api/client-nuxt/bundle/client.ts
@@ -188,9 +188,10 @@ export const createClient = (config: Config = {}): Client => {
   const makeSseFn =
     (method: Uppercase<HttpMethod>) => async (options: RequestOptions) => {
       const { opts, url } = await beforeRequest(options);
+      const unwrappedOpts = unwrapRefs(opts);
+      const { body, ...sseOpts } = unwrappedOpts;
       return createSseClient({
-        ...unwrapRefs(opts),
-        body: opts.body as BodyInit | null | undefined,
+        ...sseOpts,
         method,
         onRequest: undefined,
         signal: unwrapRefs(opts.signal) as AbortSignal,