chore(langchain): fix deprecation warnings

[cbornet]

No description provided.

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Preview	Comments	Updated (UTC)
langchain	Ready	Preview	Comment	Sep 8, 2025 9:12pm

[codspeed-hq]

CodSpeed WallTime Performance Report

Merging #32379 will not alter performance

_{Comparing cbornet:langchain-mypy-warnings (8950e9c) with wip-v1.0 (8509efa)}

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

Summary

✅ 13 untouched benchmarks

[codspeed-hq]

CodSpeed Instrumentation Performance Report

Merging #32379 will not alter performance

_{Comparing cbornet:langchain-mypy-warnings (8950e9c) with wip-v1.0 (8509efa)}

Summary

✅ 14 untouched benchmarks

[Copilot]

Pull Request Overview

This PR removes Pydantic v1 compatibility code and deprecation warnings to modernize the LangChain codebase. The changes focus on cleaning up legacy Pydantic patterns that are no longer needed.

• Removes mypy configuration that was treating deprecation warnings as notes
• Eliminates Pydantic v1 compatibility checks and fallback methods
• Updates method calls to use modern Pydantic v2 equivalents

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
pyproject.toml	Removes mypy config for deprecation warning handling
utils/pydantic.py	Adds type ignore comment for deprecated import
output_parsers/yaml.py	Removes Pydantic v1 compatibility checks for validation and schema methods
chains/openai_functions/qa_with_structure.py	Removes fallback to legacy schema() method
chains/openai_functions/citation_fuzzy_match.py	Removes fallback to legacy schema() method
chains/base.py	Updates deprecated dict() method to modern model_dump()