Use re-exports instead of TypeAliases in email.parser (#7665)

stdlib/email/__init__.pyi

@@ -1,11 +1,10 @@
 from collections.abc import Callable
 from email.message import Message
 from email.policy import Policy
-from typing import IO, TypeVar, Union
+from typing import IO, Union
 from typing_extensions import TypeAlias
 
 # Definitions imported by multiple submodules in typeshed
-_MessageT = TypeVar("_MessageT", bound=Message)  # noqa: Y018
 _ParamType: TypeAlias = Union[str, tuple[str | None, str | None, str]]
 _ParamsType: TypeAlias = Union[str, None, tuple[str, str | None, str]]
 

stdlib/email/feedparser.pyi

@@ -1,11 +1,12 @@
 from collections.abc import Callable
-from email import _MessageT
 from email.message import Message
 from email.policy import Policy
-from typing import Generic, overload
+from typing import Generic, TypeVar, overload
 
 __all__ = ["FeedParser", "BytesFeedParser"]
 
+_MessageT = TypeVar("_MessageT", bound=Message)
+
 class FeedParser(Generic[_MessageT]):
     @overload
     def __init__(self: FeedParser[Message], _factory: None = ..., *, policy: Policy = ...) -> None: ...

stdlib/email/parser.pyi

@@ -1,16 +1,11 @@
-import email.feedparser
 from collections.abc import Callable
-from email import _MessageT
+from email.feedparser import BytesFeedParser as BytesFeedParser, FeedParser as FeedParser
 from email.message import Message
 from email.policy import Policy
 from typing import BinaryIO, TextIO
-from typing_extensions import TypeAlias
 
 __all__ = ["Parser", "HeaderParser", "BytesParser", "BytesHeaderParser", "FeedParser", "BytesFeedParser"]
 
-FeedParser: TypeAlias = email.feedparser.FeedParser[_MessageT]
-BytesFeedParser: TypeAlias = email.feedparser.BytesFeedParser[_MessageT]
-
 class Parser:
     def __init__(self, _class: Callable[[], Message] | None = ..., *, policy: Policy = ...) -> None: ...
     def parse(self, fp: TextIO, headersonly: bool = ...) -> Message: ...