typing and changelog

CHANGELOG.md

@@ -19,7 +19,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - Added Shift+scroll wheel and ctrl+scroll wheel to scroll horizontally
 - Added `Tree.action_toggle_node` to toggle a node without selecting, and bound it to <kbd>Space</kbd> https://github.com/Textualize/textual/issues/1433
 - Added `Tree.reset` to fully reset a `Tree` https://github.com/Textualize/textual/issues/1437
-- Added DOMNode.watch method https://github.com/Textualize/textual/pull/1750
+- Added DOMNode.watch method  https://github.com/Textualize/textual/pull/1750
 
 ### Changed
 
@@ -43,6 +43,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 ### Removed
 
 - Methods `MessagePump.emit` and `MessagePump.emit_no_wait` https://github.com/Textualize/textual/pull/1738
+- Removed `reactive.watch` in favor of DOMNode.watch.
 
 ## [0.10.1] - 2023-01-20
 

src/textual/dom.py

@@ -4,7 +4,6 @@ import re
 from inspect import getfile
 from typing import (
     TYPE_CHECKING,
-    Callable,
     ClassVar,
     Iterable,
     Iterator,
@@ -23,6 +22,7 @@ from rich.tree import Tree
 
 from ._context import NoActiveAppError
 from ._node_list import NodeList
+from ._types import CallbackType
 from .binding import Bindings, BindingType
 from .color import BLACK, WHITE, Color
 from .css._error_tools import friendly_list
@@ -649,7 +649,11 @@ class DOMNode(MessagePump):
         return [child for child in self.children if child.display]
 
     def watch(
-        self, obj: DOMNode, attribute_name: str, callback: Callable, init: bool = True
+        self,
+        obj: DOMNode,
+        attribute_name: str,
+        callback: CallbackType,
+        init: bool = True,
     ) -> None:
         """Watches for modifications to reactive attributes on another object.
 

src/textual/reactive.py

@@ -17,7 +17,7 @@ import rich.repr
 
 from . import events
 from ._callback import count_parameters
-from ._types import MessageTarget
+from ._types import MessageTarget, CallbackType
 
 if TYPE_CHECKING:
     from .dom import DOMNode
@@ -329,7 +329,7 @@ def _watch(
     node: DOMNode,
     obj: Reactable,
     attribute_name: str,
-    callback: Callable[[Any], object],
+    callback: CallbackType,
     *,
     init: bool = True,
 ) -> None: