Some small tweaks to Werkzeug stubs: (#2784)

* default_exceptions is a dict of classes, not instances
* Correctly overload 'redirect' to get the proper return type
* Request.get_data() is an Any (not bytes), just like Response.get_data

third_party/2and3/werkzeug/exceptions.pyi

@@ -22,7 +22,7 @@ class HTTPException(Exception):
     def get_response(self, environ: Optional[Union[WSGIEnvironment, _EnvironContainer]] = ...) -> Response: ...
     def __call__(self, environ: WSGIEnvironment, start_response: StartResponse) -> Iterable[bytes]: ...
 
-default_exceptions: Dict[int, HTTPException]
+default_exceptions: Dict[int, Type[HTTPException]]
 
 class BadRequest(HTTPException):
     code = ...  # type: int

third_party/2and3/werkzeug/utils.pyi

@@ -1,4 +1,4 @@
-from typing import Any, Optional
+from typing import Any, Optional, overload, Type, TypeVar
 from werkzeug._internal import _DictAccessorProperty
 from werkzeug.wrappers import Response
 
@@ -31,7 +31,15 @@ def format_string(string, context): ...
 def secure_filename(filename): ...
 def escape(s, quote: Optional[Any] = ...): ...
 def unescape(s): ...
-def redirect(location, code: int = ..., Response: Optional[Any] = ...) -> Response: ...
+
+# 'redirect' returns a werkzeug Response, unless you give it
+# another Response type to use instead.
+_RC = TypeVar("_RC", bound=Response)
+@overload
+def redirect(location, code: int = ..., Response: None = ...) -> Response: ...
+@overload
+def redirect(location, code: int = ..., Response: Type[_RC] = ...) -> _RC: ...
+
 def append_slash_redirect(environ, code: int = ...): ...
 def import_string(import_name, silent: bool = ...): ...
 def find_modules(import_path, include_packages: bool = ..., recursive: bool = ...): ...

third_party/2and3/werkzeug/wrappers.pyi

@@ -43,7 +43,8 @@ class BaseRequest:
     args = ...  # type: ImmutableMultiDict
     @property
     def data(self) -> bytes: ...
-    def get_data(self, cache: bool = ..., as_text: bool = ..., parse_form_data: bool = ...) -> bytes: ...
+    # TODO: once Literal types are supported, overload with as_text
+    def get_data(self, cache: bool = ..., as_text: bool = ..., parse_form_data: bool = ...) -> Any: ...  # returns bytes if as_text is False (the default), else Text
     form = ...  # type: ImmutableMultiDict
     values = ...  # type: CombinedMultiDict
     files = ...  # type: MultiDict
@@ -105,6 +106,7 @@ class BaseResponse:
     def force_type(cls: Type[_SelfT], response: object, environ: Optional[WSGIEnvironment] = ...) -> _SelfT: ...
     @classmethod
     def from_app(cls: Type[_SelfT], app: Any, environ: WSGIEnvironment, buffered: bool = ...) -> _SelfT: ...
+    # TODO: once Literal types are supported, overload with as_text
     def get_data(self, as_text: bool = ...) -> Any: ...  # returns bytes if as_text is False (the default), else Text
     def set_data(self, value: Union[bytes, Text]) -> None: ...
     data = ...  # type: Any