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fix: forward TResponse generic through SDK Options type for SSE endpo… #3466
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@bilby91 why change this to
never?There was a problem hiding this comment.
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@mrlubos The never is needed because of a type conflict that this PR introduces. Here's the full context:
What changed in SseFn (line 159 in each client's types.gen.ts):
Only the options parameter changed. The return type still uses TData, so stream typing is unaffected.
Why it's needed: This PR adds TResponse to the SDK Options type for SSE endpoints. The generated code now looks like:
Options<..., EventSubscribeResponse> resolves onSseEvent to StreamEvent (via RequestOptions). But client.sse.get expects StreamEvent<{ 200: Event }> (via RequestOptions). These are incompatible when spreading options.
Without never, npx tsgo --noEmit on the sdks package produces 6 errors:
Using never in SseFn's options parameter resolves this: StreamEvent is assignable to any StreamEvent (since never is the bottom type), so the spread works. SseFn is only used internally as Client.sse.* — users never interac with it directly. The typing users see comes from:
Verification: I added a type-level test at packages/openapi-ts-tests/sdks/test/sse-typecheck.ts that exercises both paths against the opencode SDK snapshots:
The cleaner long-term fix would be to split the TData generic in ServerSentEventsOptions into two — one for onSseEvent and one for stream — so both can be typed independently without never. But that's a larger client-core refactor. Happy to take it on if you'd prefer, but wanted to keep this PR scoped.