Merge pull request #3480 from hey-api/copilot/sub-pr-3479

Revert "Support async `createClientConfig` for per-request client configuration"

Author: mrlubos

packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/sse-tanstack-react-query/client.gen.ts

@@ -11,6 +11,6 @@ import type { ClientOptions as ClientOptions2 } from './types.gen';
  * `setConfig()`. This is useful for example if you're using Next.js
  * to ensure your client always has the correct values.
  */
-export type CreateClientConfig<T extends ClientOptions = ClientOptions2> = (override?: Config<ClientOptions & T>) => Config<Required<ClientOptions> & T> | Promise<Config<Required<ClientOptions> & T>>;
+export type CreateClientConfig<T extends ClientOptions = ClientOptions2> = (override?: Config<ClientOptions & T>) => Config<Required<ClientOptions> & T>;
 
 export const client = createClient(createConfig<ClientOptions2>());

packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/sse-tanstack-react-query/client/types.gen.ts

@@ -190,7 +190,7 @@ export type Client = CoreClient<RequestFn, Config, MethodFn, BuildUrlFn, SseFn>
  */
 export type CreateClientConfig<T extends ClientOptions = ClientOptions> = (
   override?: Config<ClientOptions & T>,
-) => Config<Required<ClientOptions> & T> | Promise<Config<Required<ClientOptions> & T>>;
+) => Config<Required<ClientOptions> & T>;
 
 export interface TDataShape {
   body?: unknown;