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>
formatSSE() in streamHelpers.ts explicitly returned 'data: null' for
null/undefined data. This violates SSE protocol and causes
AI_TypeValidationError in strict clients (Zod-based AI SDKs).
Now returns empty string, silently skipping null chunks.
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