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The llm package called the user-supplied onSpec/onError handlers
without awaiting them. In the /preview/stream route onSpec is async
(it does `await cacheSpec(...)` then writes the SSE `spec` event), so
the api handler's `await streamSpecFromAnthropic(...)` returned BEFORE
the terminal event had been written. The route's finally block then
ran `reply.raw.end()`, the queued `send('spec', ...)` hit a closed
stream and silently no-op'd, and the browser saw zero terminal
events — frontend ran into the "Spec generation failed." fallback
even though Anthropic had delivered a perfectly valid spec.
Verified against prod log: req-8 ran 66s with 200 and produced no
preview_spec_* log line, which is exactly the success-but-event-lost
signature.
Fix:
- StreamHandlers.onSpec / onError typed as Promise<void> | void
- Both call sites in streamSpecFromAnthropic now `await` them
- /preview/stream sets `resolved = true` at the END of each handler
(after the SSE write completes) so the post-stream "unresolved"
fallback only fires on a genuine programming bug
- Added preview_spec_ready info log on the happy path so future
diagnosis doesn't have to infer success from the absence of error
logs
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| .. | ||
| index.ts | ||