v4.2.0

What's Changed

• fix(message-placeholders): use plain text langchain format for placeh… by @nimarb in https://github.com/langfuse/langfuse-js/pull/616
• chore: add test for observation error level through langchain integration by @nimarb in https://github.com/langfuse/langfuse-js/pull/637
• feat(api): update API spec from langfuse/langfuse 0b68c41 by @langfuse-bot in https://github.com/langfuse/langfuse-js/pull/640
• fix(openai): parse response usage by @hassiebp in https://github.com/langfuse/langfuse-js/pull/641

New Contributors

• @langfuse-bot made their first contribution in https://github.com/langfuse/langfuse-js/pull/640

Full Changelog: https://github.com/langfuse/langfuse-js/compare/v4.1.0...v4.2.0