chore: Define Auth type alias in types module

cookiecutter/tap-template/{{cookiecutter.tap_id}}/{{cookiecutter.library_name}}/rest-client.py

@@ -47,11 +47,9 @@
     import importlib_resources
 
 if TYPE_CHECKING:
-    from singer_sdk.helpers.types import Context
+    from singer_sdk.helpers.types import Auth, Context
 
 
-_Auth = Callable[[requests.PreparedRequest], requests.PreparedRequest]
-
 # TODO: Delete this is if not using json files for schema definition
 SCHEMAS_DIR = importlib_resources.files(__package__) / "schemas"
 
@@ -74,7 +72,7 @@ def url_base(self) -> str:
 {%- if cookiecutter.auth_method in ("OAuth2", "JWT") %}
 
     @cached_property
-    def authenticator(self) -> _Auth:
+    def authenticator(self) -> Auth:
         """Return a new authenticator object.
 
         Returns:

singer_sdk/helpers/types.py

@@ -5,6 +5,8 @@
 import sys
 import typing as t
 
+import requests
+
 if sys.version_info < (3, 9):
     from typing import Mapping  # noqa: ICN003
 else:
@@ -15,10 +17,12 @@
 else:
     from typing import TypeAlias  # noqa: ICN003
 
+
 __all__ = [
     "Context",
     "Record",
 ]
 
 Context: TypeAlias = Mapping[str, t.Any]
 Record: TypeAlias = t.Dict[str, t.Any]
+Auth: TypeAlias = t.Callable[[requests.PreparedRequest], requests.PreparedRequest]

singer_sdk/streams/rest.py

@@ -26,25 +26,18 @@
 from singer_sdk.streams.core import Stream
 
 if t.TYPE_CHECKING:
-    import sys
     from datetime import datetime
 
     from backoff.types import Details
 
     from singer_sdk._singerlib import Schema
-    from singer_sdk.helpers.types import Context
+    from singer_sdk.helpers.types import Auth, Context
     from singer_sdk.tap_base import Tap
 
-    if sys.version_info >= (3, 10):
-        from typing import TypeAlias  # noqa: ICN003
-    else:
-        from typing_extensions import TypeAlias
-
 DEFAULT_PAGE_SIZE = 1000
 DEFAULT_REQUEST_TIMEOUT = 300  # 5 minutes
 
 _TToken = t.TypeVar("_TToken")
-_Auth: TypeAlias = t.Callable[[requests.PreparedRequest], requests.PreparedRequest]
 
 
 class RESTStream(Stream, t.Generic[_TToken], metaclass=abc.ABCMeta):  # noqa: PLR0904
@@ -610,7 +603,7 @@ def parse_response(self, response: requests.Response) -> t.Iterable[dict]:
     # Abstract methods:
 
     @property
-    def authenticator(self) -> _Auth:
+    def authenticator(self) -> Auth:
         """Return or set the authenticator for managing HTTP auth headers.
 
         If an authenticator is not specified, REST-based taps will simply pass