Improve flask-cors stubs (#11708)

stubs/Flask-Cors/flask_cors/core.pyi

@@ -2,7 +2,7 @@ from collections.abc import Iterable
 from datetime import timedelta
 from logging import Logger
 from re import Pattern
-from typing import Any, TypedDict, TypeVar, overload
+from typing import Any, Literal, TypedDict, TypeVar, overload
 from typing_extensions import TypeAlias
 
 import flask
@@ -46,7 +46,10 @@ def get_cors_origins(options: _Options, request_origin: str | None) -> list[str]
 def get_allow_headers(options: _Options, acl_request_headers: str | None) -> str | None: ...
 def get_cors_headers(options: _Options, request_headers: dict[str, Any], request_method: str) -> _MultiDict: ...
 def set_cors_headers(resp: flask.Response, options: _Options) -> flask.Response: ...
-def probably_regex(maybe_regex: str | Pattern[str]) -> bool: ...
+@overload
+def probably_regex(maybe_regex: Pattern[str]) -> Literal[True]: ...
+@overload
+def probably_regex(maybe_regex: str) -> bool: ...
 def re_fix(reg: str) -> str: ...
 def try_match_any(inst: str, patterns: Iterable[str | Pattern[str]]) -> bool: ...
 def try_match(request_origin: str, maybe_regex: str | Pattern[str]) -> bool: ...

stubs/Flask-Cors/flask_cors/extension.pyi

@@ -1,4 +1,3 @@
-from _typeshed import Incomplete
 from collections.abc import Callable, Iterable
 from datetime import timedelta
 from logging import Logger
@@ -11,7 +10,7 @@ LOG: Logger
 class CORS:
     def __init__(
         self,
-        app: Incomplete | None = None,
+        app: flask.Flask | None = None,
         *,
         resources: dict[str, dict[str, Any]] | list[str] | str | None = ...,
         origins: str | list[str] | None = ...,