The hasValuableContent() function in streamHelpers.ts returned undefined
instead of explicit false when checking empty delta chunks. This caused
JavaScript type coercion issues where undefined !== '' evaluated to true,
passing empty chunks through to clients.
Fix: Replace implicit returns with explicit boolean returns using
typeof checks and length comparisons for all content fields (content,
reasoning_content, tool_calls, text, thinking, partial_json).
Test: Added unit tests covering OpenAI, Claude, and Gemini format edge cases.
Co-authored-by: oyi77 <oyi77@users.noreply.github.com>
Paijo
63e42047e3