initial commit

venv/Lib/site-packages/langgraph/typing.py

@@ -0,0 +1,48 @@
+from __future__ import annotations
+
+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=StateLike | None, default=None)
+"""Type variable used to represent graph run scoped context.
+
+Defaults to `None`.
+"""
+
+ContextT_contra = TypeVar(
+    "ContextT_contra", bound=StateLike | None, contravariant=True, default=None
+)
+
+InputT = TypeVar("InputT", bound=StateLike, default=StateT)
+"""Type variable used to represent the input to a `StateGraph`.
+
+Defaults to `StateT`.
+"""
+
+OutputT = TypeVar("OutputT", bound=StateLike, default=StateT)
+"""Type variable used to represent the output of a `StateGraph`.
+
+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)