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langchain-mongodb's minimum python version is now 3.10. That means the following in langchain-mongodb.graphrag.graph is no longer required.

if TYPE_CHECKING:
    try:
        from typing import TypeAlias  # type:ignore[attr-defined] # Python 3.10+
    except ImportError:
        from typing_extensions import TypeAlias  # Python 3.9 fallback

Definition of done

Update. Look for similar instances in other places.