Changelog

4.2.0 (2025-09-19)

✨ Features

• api: update API spec from langfuse/langfuse 0b68c41 (#640) (2aff295)

🐛 Bug Fixes

• message-placeholders: use plain text langchain format for placeh… (#616) (7229b1a)
• openai: parse response usage (#641) (882146b)

🔧 Maintenance

• add test for observation error level through langchain integration (#637) (f23386c)

4.1.0 (2025-09-17)

✨ Features

• experiments: add experiment runner (#604) (6a247dc)

4.0.1 (2025-09-11)

🐛 Bug Fixes

• otel: exporter version range (#611) (91db2c6)

4.0.0 (2025-08-28)

4.0.0-beta.9 (2025-08-28)

🐛 Bug Fixes

• tracing: change signature of updateActiveObservation (#598) (c8200b6)

🔧 Maintenance

• deps-dev: bump happy-dom from 14.12.3 to 18.0.1 (#585) (4ee7269)

📚 Documentation

• fix readme v4 release (34d641e)
• fix typo readme (6a94834)

4.0.0-beta.8 (2025-08-26)

✨ Features

• tracing: add observation types (#594) (31586ff)

4.0.0-beta.7 (2025-08-25)

✨ Features

• vercel-ai-sdk: add media processing (#593) (7d3ee3a)

4.0.0-beta.6 (2025-08-25)

🐛 Bug Fixes

• processor: move to crypto.subtle (#592) (f05a777)
• serializer: do not serialize string primitives (#591) (df9b0b8)

4.0.0-beta.5 (2025-08-20)

✨ Features

• span-processor: add export modes (#590) (d2f7386)

4.0.0-beta.4 (2025-08-20)

✨ Features

• tracing: add endOnExit option (15568d9)

4.0.0-beta.3 (2025-08-19)

✨ Features

• tracing: add getActiveSpanId (63015d8)
• tracing: add getActiveTraceID (#589) (ec8a54c)
• tracing: add parentSpanContext to observe wrapper (1349804)
• tracing: isolated tracer provider (#588) (5755686)

🐛 Bug Fixes

• observe: preserve this context (39f5c2d)

🔧 Maintenance

• auto access npm OTP (2ba7da2)
• bump vitest and remove outdated esbuild (#587) (4e320da)
• deps-dev: bump happy-dom from 14.12.3 to 15.10.2 (#584) (836ba31)
• update eslint (8459b4e)
• update release it Github release flow (7f26462)

📚 Documentation

• update contributing.md (d54ba62)

4.0.0-beta.2 (2025-08-08)

🐛 Bug Fixes

• span-processor: drop dep on Buffer (28c9985)

📚 Documentation

• add jsdoc for client and otel package (16c6366)
• add jsdoc for openai and tracing package (e2182ec)

4.0.0-beta.1 (2025-08-07)

🔧 Maintenance

• add Github release to release-it (184cd81)
• add package readmes (031760c)

4.0.0-beta.0 (2025-08-07)

🔧 Maintenance

• client: make params optional (d55ab80)
• otel: export types (1febde7)

4.0.0-alpha.3 (2025-08-07)

🔧 Maintenance

• remove build files from typecheck (d7498a6)

4.0.0-alpha.2 (2025-08-07)

🔧 Maintenance

• remove prepublish hook (324cb8f)

4.0.0-alpha.1 (2025-08-07)

4.0.0-alpha.0 (2025-08-07)

✨ Features

• upgrade to v4 (#583) (e311b18)

🔧 Maintenance

• add claude.md file (#579) (945d891)
• bump version (09bff17)
• deps: bump form-data from 4.0.2 to 4.0.4 (#577) (ecb4a6e)
• reduce claude permissions (#582) (4294460)