feat(adapter-teams): native streaming for DMs via emit#416
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Apr 29, 2026
Use ctx.stream.emit() from the Teams SDK for DM streaming instead of manual post+edit. This sends proper typing activities with streamType channelData, giving the native streaming UI in Teams. - Capture IStreamer from activity context in handleMessageActivity - Block handler with deferred promise so stream stays alive during processing - streamViaEmit() for DMs: uses stream.emit() with incremental text deltas - Group chats: accumulate full response and post as single message (no flicker) - Handle StreamCancelledError and stream.canceled for graceful cancellation Co-Authored-By: Claude <noreply@anthropic.com>
Group chats now accumulate streamed chunks and post as a single message instead of post+edit, so assertions should check sentActivities not updatedActivities.
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Ports vercel/chat#416 — native Teams streaming for DMs via emit. DM threads now use the Bot Framework streaming protocol (typing activities with channelData.streamType=streaming + streamSequence, then a final message activity with streamType=final) instead of Thread._fallback_stream. Group chats accumulate and post a single message, matching upstream's flicker-free behavior. - Wire format: streamId omitted on first chunk, present on both channelData and streaminfo entity for subsequent and final activities - Throttle: configurable native_stream_min_emit_interval_ms (default 1500ms), honors StreamOptions.update_interval_ms - End-of-stream flush ensures buffered text is confirmed-accepted before close - Send-failure mid-stream cancels session and re-raises (keeps Thread.stream history consistent with delivered chunks) - Migration to microsoft-teams-apps SDK tracked as issue #93 (out of scope for 4.27.0)
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Summary
ctx.stream.emit()for DM streaming instead of manual post+editstreamType: 'streaming'channelData)stream.canceled+StreamCancelledError)How it works
handleMessageActivitycapturesctx.streamfor DMs and blocks the handler via a deferred promise wired throughwaitUntil— this keeps the Teams SDK from auto-closing the stream before processing completesstreamViaEmit()sends incremental text deltas viastream.emit(), framework auto-closes withstreamType: 'final'IStreameris availableAlso adds missing
@slack/socket-modedep to adapter-slack.Test plan
pnpm --filter @chat-adapter/teams buildpassespnpm --filter @chat-adapter/teams test— 148 tests pass