feat: relax typing_extensions version constraint

Author: egormkn

pyproject.toml

@@ -11,7 +11,7 @@ license = {file = "LICENSE"}
 dynamic = ["version", "description"]
 dependencies = [
     "ipywidgets",
-    "typing_extensions >= 4.1.1",
+    "typing_extensions >= 3.7.0",
 ]
 
 classifiers = [

reacton/core.py

@@ -40,7 +40,6 @@
 import ipywidgets
 import ipywidgets as widgets
 import traitlets
-import typing_extensions
 from typing_extensions import Literal, Protocol
 
 import reacton.logging  # noqa: F401  # has sidefx
@@ -87,7 +86,12 @@ def get():
 V = TypeVar("V")  # used for value type of widget
 V2 = TypeVar("V2")  # used for value type of widget
 E = TypeVar("E")  # used for elements
-P = typing_extensions.ParamSpec("P")
+
+try:
+    from typing_extensions import ParamSpec
+    P = ParamSpec("P")
+except ImportError:
+    P = ...
 
 WidgetOrList = Union[widgets.Widget, List[widgets.Widget]]
 EffectCleanupCallable = Callable[[], None]