feat(stream): Created base handler to share functionality between handlers, mocked logger functionality

[Murike]

User description

(TS SDK Parity Effort) Missing - Streaming Support

[sc-43778] - https://app.shortcut.com/galileo/story/43778/ts-sdk-parity-effort-missing-streaming-support

Description

• Added base class to share functionality between handlers (OpenAI, Langchain)
• Added more support for error management

Obs.: The Galileo Logger PR implemented several features for stream mode support. Current PR reviewed endpoints and prepared shared features the streaming operation of OpenAI and Langchain handlers can use. Future implementations can use and expand these shared functionalities too, the current implementation is limited due to differences on how OpenAI and Langchain work.

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Generated description

Below is a concise technical summary of the changes proposed in this PR:
Establishes a foundational streaming architecture by introducing a BaseStreamingAdapter and specialized utilities for metrics tracking and span finalization. Centralizes error handling and common JSON types to ensure consistency across different LLM provider implementations.

Topic	Details
Streaming Core	Provides a shared framework for LLM streaming through the BaseStreamingAdapter and metrics tracking components. Modified files (9) src/types/streaming-adapter.types.ts src/utils/galileo-logger.ts src/utils/streaming/base-streaming-adapter.ts src/utils/streaming/finalizer.ts src/utils/streaming/index.ts src/utils/streaming/metrics.ts tests/utils/streaming/base-streaming-adapter.test.ts tests/utils/streaming/finalizer.test.ts tests/utils/streaming/metrics.test.ts Latest Contributors(2) User Commit Date Murike feat-logger-Improved-b... January 19, 2026 juandrucker@rungalileo.io feat-support-ingesting... July 25, 2025
Error & Type Utils	Standardizes error mapping via ErrorManager and consolidates core JSON type definitions. Modified files (6) src/types/base.types.ts src/types/logging/logger.types.ts src/types/logging/span.types.ts src/types/logging/step.types.ts src/utils/errors.ts src/utils/task-handler.ts Latest Contributors(2) User Commit Date Murike feat-logger-Improved-b... January 19, 2026 juandrucker@rungalileo.io feat-support-ingesting... July 25, 2025

This pull request is reviewed by Baz. Review like a pro on (Baz).

[Murike]

Excessive number of "formatting" commits was for troubleshooting problem in local pre-commit. Issue was resolved cleaning cache, commands below:

pre-commit clean 
rm -rf ~/.cache/pre-commit