core: Add ruff rules TC (#29268)

See https://docs.astral.sh/ruff/rules/#flake8-type-checking-tc
Some fixes done for TC001,TC002 and TC003 but these rules are excluded
since they don't play well with Pydantic.

---------

Co-authored-by: Chester Curme <chester.curme@gmail.com>

libs/core/langchain_core/runnables/base.py

@@ -60,7 +60,6 @@ from langchain_core.runnables.config import (
     run_in_executor,
 )
 from langchain_core.runnables.graph import Graph
-from langchain_core.runnables.schema import StreamEvent
 from langchain_core.runnables.utils import (
     AddableDict,
     AnyConfigurableField,
@@ -94,6 +93,7 @@ if TYPE_CHECKING:
     from langchain_core.runnables.fallbacks import (
         RunnableWithFallbacks as RunnableWithFallbacksT,
     )
+    from langchain_core.runnables.schema import StreamEvent
     from langchain_core.tools import BaseTool
     from langchain_core.tracers.log_stream import (
         RunLog,

libs/core/langchain_core/runnables/configurable.py

@@ -7,6 +7,7 @@ from collections.abc import AsyncIterator, Iterator, Sequence
 from collections.abc import Mapping as Mapping
 from functools import wraps
 from typing import (
+    TYPE_CHECKING,
     Any,
     Callable,
     Optional,
@@ -26,7 +27,6 @@ from langchain_core.runnables.config import (
     get_executor_for_config,
     merge_configs,
 )
-from langchain_core.runnables.graph import Graph
 from langchain_core.runnables.utils import (
     AnyConfigurableField,
     ConfigurableField,
@@ -39,6 +39,9 @@ from langchain_core.runnables.utils import (
     get_unique_config_specs,
 )
 
+if TYPE_CHECKING:
+    from langchain_core.runnables.graph import Graph
+
 
 class DynamicRunnable(RunnableSerializable[Input, Output]):
     """Serializable Runnable that can be dynamically configured.

libs/core/langchain_core/runnables/graph.py

@@ -2,7 +2,6 @@ from __future__ import annotations
 
 import inspect
 from collections import defaultdict
-from collections.abc import Sequence
 from dataclasses import dataclass, field
 from enum import Enum
 from typing import (
@@ -18,11 +17,13 @@ from typing import (
 )
 from uuid import UUID, uuid4
 
-from pydantic import BaseModel
-
 from langchain_core.utils.pydantic import _IgnoreUnserializable, is_basemodel_subclass
 
 if TYPE_CHECKING:
+    from collections.abc import Sequence
+
+    from pydantic import BaseModel
+
     from langchain_core.runnables.base import Runnable as RunnableType
 
 

libs/core/langchain_core/runnables/passthrough.py

@@ -5,7 +5,7 @@ from __future__ import annotations
 import asyncio
 import inspect
 import threading
-from collections.abc import AsyncIterator, Awaitable, Iterator, Mapping
+from collections.abc import Awaitable
 from typing import (
     TYPE_CHECKING,
     Any,
@@ -32,7 +32,6 @@ from langchain_core.runnables.config import (
     get_executor_for_config,
     patch_config,
 )
-from langchain_core.runnables.graph import Graph
 from langchain_core.runnables.utils import (
     AddableDict,
     ConfigurableFieldSpec,
@@ -42,10 +41,13 @@ from langchain_core.utils.iter import safetee
 from langchain_core.utils.pydantic import create_model_v2
 
 if TYPE_CHECKING:
+    from collections.abc import AsyncIterator, Iterator, Mapping
+
     from langchain_core.callbacks.manager import (
         AsyncCallbackManagerForChainRun,
         CallbackManagerForChainRun,
     )
+    from langchain_core.runnables.graph import Graph
 
 
 def identity(x: Other) -> Other:

libs/core/langchain_core/runnables/router.py

@@ -1,8 +1,9 @@
 from __future__ import annotations
 
-from collections.abc import AsyncIterator, Iterator, Mapping
+from collections.abc import Mapping
 from itertools import starmap
 from typing import (
+    TYPE_CHECKING,
     Any,
     Callable,
     Optional,
@@ -31,6 +32,9 @@ from langchain_core.runnables.utils import (
     get_unique_config_specs,
 )
 
+if TYPE_CHECKING:
+    from collections.abc import AsyncIterator, Iterator
+
 
 class RouterInput(TypedDict):
     """Router input.

libs/core/langchain_core/runnables/schema.py

@@ -2,11 +2,13 @@
 
 from __future__ import annotations
 
-from collections.abc import Sequence
-from typing import Any, Literal, Union
+from typing import TYPE_CHECKING, Any, Literal, Union
 
 from typing_extensions import NotRequired, TypedDict
 
+if TYPE_CHECKING:
+    from collections.abc import Sequence
+
 
 class EventData(TypedDict, total=False):
     """Data associated with a streaming event."""

libs/core/langchain_core/runnables/utils.py

@@ -6,19 +6,11 @@ import ast
 import asyncio
 import inspect
 import textwrap
-from collections.abc import (
-    AsyncIterable,
-    AsyncIterator,
-    Awaitable,
-    Coroutine,
-    Iterable,
-    Mapping,
-    Sequence,
-)
 from functools import lru_cache
 from inspect import signature
 from itertools import groupby
 from typing import (
+    TYPE_CHECKING,
     Any,
     Callable,
     NamedTuple,
@@ -30,11 +22,22 @@ from typing import (
 
 from typing_extensions import TypeGuard, override
 
-from langchain_core.runnables.schema import StreamEvent
-
 # Re-export create-model for backwards compatibility
 from langchain_core.utils.pydantic import create_model as create_model
 
+if TYPE_CHECKING:
+    from collections.abc import (
+        AsyncIterable,
+        AsyncIterator,
+        Awaitable,
+        Coroutine,
+        Iterable,
+        Mapping,
+        Sequence,
+    )
+
+    from langchain_core.runnables.schema import StreamEvent
+
 Input = TypeVar("Input", contravariant=True)
 # Output type should implement __concat__, as eg str, list, dict do
 Output = TypeVar("Output", covariant=True)