Move InferFn to typing.py

Author: DanielNoord

astroid/inference_tip.py

@@ -11,8 +11,8 @@
 from astroid import bases, util
 from astroid.exceptions import InferenceOverwriteError, UseInferenceDefault
 from astroid.nodes import NodeNG
+from astroid.typing import InferFn
 
-InferFn = typing.Callable[..., typing.Any]
 InferOptions = typing.Union[
     NodeNG, bases.Instance, bases.UnboundMethod, typing.Type[util.Uninferable]
 ]

astroid/nodes/node_ng.py

@@ -33,6 +33,7 @@
 from astroid.nodes.as_string import AsStringVisitor
 from astroid.nodes.const import OP_PRECEDENCE
 from astroid.nodes.utils import Position
+from astroid.typing import InferFn
 
 if TYPE_CHECKING:
     from astroid import nodes
@@ -88,7 +89,7 @@ class NodeNG:
     _other_other_fields: ClassVar[typing.Tuple[str, ...]] = ()
     """Attributes that contain AST-dependent fields."""
     # instance specific inference function infer(node, context)
-    _explicit_inference = None
+    _explicit_inference: Optional[InferFn] = None
 
     def __init__(
         self,

astroid/typing.py

@@ -3,7 +3,7 @@
 # Copyright (c) https://github.com/PyCQA/astroid/blob/main/CONTRIBUTORS.txt
 
 import sys
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, Any, Callable
 
 if TYPE_CHECKING:
     from astroid import nodes
@@ -22,3 +22,6 @@ class InferenceErrorInfo(TypedDict):
 
     node: "nodes.NodeNG"
     context: "InferenceContext | None"
+
+
+InferFn = Callable[..., Any]