s2-streamstore/s2-sdk-typescript

Patch Changes

• a478434: fix: persistToS2 now actually invokes onSeqNumMismatch (#248)

  The per-record instanceof SeqNumMismatchError check was unreachable — Producer.submit()
  wraps a pump failure in a generic S2Error, so the callback never fired. The genuine
  SeqNumMismatchError surfaces from producer.close(), so the handling now runs after the
  producer is closed: when the persist failure is (or contains) a SeqNumMismatchError and an
  onSeqNumMismatch callback was provided, it's invoked and treated as an expected
  fenced/concurrent-writer condition instead of being thrown. Callers without the callback are
  unaffected (the failure still throws).

• 6019944: fix: SSE reconnect now fails fast on permanent HTTP errors instead of retrying forever (#232)

  The auto-reconnect loop in subscribeSse retried on every fetch error, so a permanent
  failure (401/403/404) was retried indefinitely. fetchOk now throws an HttpError
  carrying the status, and the loop surfaces permanent errors (4xx other than 408/429)
  to the caller instead of reconnecting. Transient errors (network failures, 408, 429, 5xx)
  are still retried.

• f3ec15a: fix: SSE subscriptions reconnect on mid-stream errors instead of crashing (#249)

  subscribeSse only wrapped the fetchOk call in try/catch, not the for await
  over pipeSseFrames. When the response body errored mid-iteration, the throw
  escaped before the reconnection logic could run, so the subscription crashed with
  no recovery. The loop is now wrapped: it reconnects from the last cursor when
  reconnectBackoffMs is set and rethrows when reconnect is disabled, matching the
  TanStack subscribeChunks path. This restores behavior dropped in #241.

• b4499c6: fix: TanStack AI chat no longer hangs when the replay endpoint returns HTTP 204 (#250)

  subscribeChunks returned an empty stream on a 204/no-body replay response, so
  TanStack's subscription loop ended without a terminal chunk and streamResponse()
  hung forever on processingComplete. It now yields a synthetic RUN_FINISHED so
  the subscription terminates cleanly. This restores the behavior dropped in #241.