[gunicorn] Add precise return type for asgi.protocol:BodyReceiver.receive (#15567)

Author: lev-blit

stubs/gunicorn/gunicorn/asgi/protocol.pyi

@@ -1,7 +1,7 @@
 import asyncio
-from _typeshed import Incomplete
 from collections.abc import Iterable
-from typing import Final
+from typing import Final, Literal, TypedDict, type_check_only
+from typing_extensions import NotRequired
 
 from gunicorn.asgi.parser import CallbackRequest
 from gunicorn.config import Config
@@ -31,6 +31,12 @@ class ASGIResponseInfo:
 
     def __init__(self, status: str | int, headers: Iterable[tuple[str | bytes, str | bytes]], sent: int) -> None: ...
 
+@type_check_only
+class _BodyReceieverReceiveReturnType(TypedDict):
+    type: Literal["http.disconnect", "http.request"]
+    body: NotRequired[bytes]
+    more_body: NotRequired[bool]
+
 class BodyReceiver:
     __slots__ = ("_chunks", "_complete", "_body_finished", "_closed", "_waiter", "request", "protocol")
     request: CallbackRequest
@@ -40,7 +46,7 @@ class BodyReceiver:
     def feed(self, chunk: bytes) -> None: ...
     def set_complete(self) -> None: ...
     def signal_disconnect(self) -> None: ...
-    async def receive(self) -> dict[str, Incomplete]: ...  # TODO: Use TypedDict
+    async def receive(self) -> _BodyReceieverReceiveReturnType: ...
 
 class ASGIProtocol(asyncio.Protocol):
     worker: ASGIWorker