Fix import

libs/checkpoint/langgraph/checkpoint/base/__init__.py

@@ -22,10 +22,10 @@ from langgraph.checkpoint.serde.base import SerializerProtocol, maybe_add_typed_
 from langgraph.checkpoint.serde.jsonplus import JsonPlusSerializer
 from langgraph.checkpoint.serde.types import (
     ERROR,
+    SCHEDULED,
     ChannelProtocol,
     SendProtocol,
 )
-from langgraph.constants import SCHEDULED
 
 V = TypeVar("V", int, float, str)
 PendingWrite = Tuple[str, str, Any]

libs/checkpoint/langgraph/checkpoint/serde/types.py

@@ -13,6 +13,7 @@ from langchain_core.runnables import RunnableConfig
 from typing_extensions import Self
 
 ERROR = "__error__"
+SCHEDULED = "__scheduled__"
 TASKS = "__pregel_tasks"
 
 Value = TypeVar("Value")