chore(cli): add mypy strict checking

[cbornet]

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[vercel]

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1 Skipped Deployment

Project	Deployment	Preview	Comments	Updated (UTC)
langchain	Ignored	Preview		Aug 19, 2025 3:36pm

[codspeed-hq]

CodSpeed WallTime Performance Report

Merging #32386 will not alter performance

_{Comparing cbornet:mypy-strict-cli (0ccbb2e) with master (02d6b91)}

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Summary

✅ 13 untouched benchmarks

[codspeed-hq]

CodSpeed Instrumentation Performance Report

Merging #32386 will not alter performance

_{Comparing cbornet:mypy-strict-cli (0ccbb2e) with master (02d6b91)}

Summary

✅ 14 untouched benchmarks

[Copilot]

Pull Request Overview

This PR enables strict mypy type checking for the CLI package by updating the mypy configuration and fixing type annotations throughout the codebase.

• Enables strict mypy checking with additional error codes and warnings
• Fixes generic type annotations to be more specific (e.g., dict → dict[str, Any])
• Adds missing return type annotations and improves type import handling

Reviewed Changes

Copilot reviewed 7 out of 8 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
libs/cli/pyproject.toml	Enables strict mypy checking and updates mypy version constraint
libs/cli/tests/unit_tests/test_utils.py	Fixes generic dict type annotation and adds Any import
libs/cli/scripts/generate_migrations.py	Makes output parameter optional in function signature
libs/cli/langchain_cli/utils/git.py	Specifies dict type with string keys and Any values
libs/cli/langchain_cli/project_template/app/server.py	Adds return type annotation to async function
libs/cli/langchain_cli/namespaces/migrate/main.py	Updates type ignore comment for untyped import
libs/cli/langchain_cli/namespaces/migrate/generate/utils.py	Specifies list type annotation for imports attribute

[Copilot]

Boolean values in TOML should be unquoted. Use strict = true instead of strict = "True".

Suggested change

	warn_unreachable = "True"
	strict = true
	strict_bytes = true
	enable_error_code = "deprecated"
	warn_unreachable = true

[cbornet]

done