[oyi77]

Part of modularization effort (Issue #3594).

Extracts type definitions from the monolithic open-sse/utils/stream.ts into a dedicated module.

Changes:

• New file: open-sse/utils/stream/types.ts (138 lines)
• Exports: StreamOptions, StreamLogger, StreamCompletePayload, StreamFailurePayload, TranslateState, ToolCall, UsageTokenRecord, SSEStreamContext, JsonRecord

Testing: No behavior change - types only. Existing stream tests pass.

Follow-up PRs will extract: utils, errors, textualToolCalls, sseFormatters, openaiChunks, claudeLifecycle, responsesLifecycle, and streamCore.

[gemini-code-assist]

Code Review

This pull request introduces a new types file open-sse/utils/stream/types.ts containing various type definitions for SSE streaming, including SSEStreamContext and StreamOptions. Feedback was provided regarding unused imports and a missing import for initState which would cause TypeScript compilation errors.

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[gemini-code-assist]

The imports on lines 1 and 2 are unused in this file. Additionally, convertOpenAIToResponsesToolCall is not exported by ../handlers/responseTranslator.ts, and TranslateState (line 45) references initState which is not imported or defined in this file. This will cause TypeScript compilation errors.\n\nRemove the unused imports and import initState from ../stream.ts instead.

Suggested change

	import { convertOpenAIToResponsesToolCall } from "../handlers/responseTranslator.ts";
	import { v4 as uuidv4 } from "uuid";
	import { initState } from "../stream.ts";

[diegosouzapw]

Thanks, @oyi77 🙏. These stream extractions are currently additive — the new modules under open-sse/utils/stream/ aren't wired into stream.ts yet, so they don't change runtime behavior on their own. Rather than land the decomposition in fragments, we're going to fold the stream split into the single coordinated modularization pass (Issue #3594) after the quality-gate work lands, so the extraction and the rewiring get sequenced together and verified lossless in one go. Closing for now — purely sequencing, not a reflection on the work; input welcome on #3594 once the plan is up.