fix: Use explicit TypeAlias throughout (#292)

Closes #272.

src/phantom/_utils/misc.py

@@ -13,6 +13,7 @@
 from typing import Tuple
 from typing import Union
 
+from typing_extensions import TypeAlias
 from typing_extensions import TypeGuard
 from typing_extensions import get_args
 from typing_extensions import get_origin
@@ -38,7 +39,7 @@ def resolve_class_attr(
  )
 
 
-BoundType = Union[type, Tuple[type, ...]]
+BoundType: TypeAlias = Union[type, Tuple[type, ...]]
 
 
 def _is_union(type_: BoundType) -> bool:

src/phantom/ext/phonenumbers.py

@@ -49,7 +49,8 @@ def _deconstruct_phone_number(
 
 
 def normalize_phone_number(
- phone_number: str, country_code: str | None = None
+ phone_number: str,
+ country_code: str | None = None,
 ) -> FormattedPhoneNumber:
  """
  Normalize ``phone_number`` using :py:const:`phonenumbers.PhoneNumberFormat.E164`.

src/phantom/iso3166.py

@@ -15,6 +15,7 @@
 from typing import Union
 from typing import cast
 
+from typing_extensions import TypeAlias
 from typing_extensions import get_args
 
 from phantom import Phantom
@@ -33,7 +34,7 @@
  "InvalidCountryCode",
 )
 
-LiteralAlpha2 = Literal[
+LiteralAlpha2: TypeAlias = Literal[
  "AF",
  "AX",
  "AL",
@@ -334,5 +335,5 @@ def __register_strategy__(cls) -> _hypothesis.SearchStrategy | None:
  return sampled_from(sorted(ALPHA2))
 
 
-Alpha2 = Union[LiteralAlpha2, ParsedAlpha2]
-CountryCode = Alpha2
+Alpha2: TypeAlias = Union[LiteralAlpha2, ParsedAlpha2]
+CountryCode: TypeAlias = Alpha2

src/phantom/predicates/_base.py

@@ -1,6 +1,8 @@
 from typing import Callable
 from typing import TypeVar
 
+from typing_extensions import TypeAlias
+
 T_contra = TypeVar("T_contra", bound=object, contravariant=True)
 
-Predicate = Callable[[T_contra], bool]
+Predicate: TypeAlias = Callable[[T_contra], bool]