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from __future__ import annotations from typing import Union from typing_extensions import TypeVar from langgraph._internal._typing import StateLike __all__ = ( "StateT", "StateT_co", "StateT_contra", "InputT", "OutputT", "ContextT", ) StateT = TypeVar("StateT", bound=StateLike) """Type variable used to represent the state in a graph.""" StateT_co = TypeVar("StateT_co", bound=StateLike, covariant=True) StateT_contra = TypeVar("StateT_contra", bound=StateLike, contravariant=True) ContextT = TypeVar("ContextT", bound=Union[StateLike, None], default=None) """Type variable used to represent graph run scoped context. Defaults to `None`. """ ContextT_contra = TypeVar( "ContextT_contra", bound=Union[StateLike, None], contravariant=True, default=None ) InputT = TypeVar("InputT", bound=StateLike, default=StateT) """Type variable used to represent the input to a state graph. Defaults to `StateT`. """ OutputT = TypeVar("OutputT", bound=StateLike, default=StateT) """Type variable used to represent the output of a state graph. Defaults to `StateT`. """ NodeInputT = TypeVar("NodeInputT", bound=StateLike) """Type variable used to represent the input to a node.""" NodeInputT_contra = TypeVar("NodeInputT_contra", bound=StateLike, contravariant=True)