Added stubs for aiofiles package (#4421)

third_party/3/aiofiles/__init__.pyi

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+from . import _os as os
+from .threadpool import open as open

third_party/3/aiofiles/_os.pyi

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+import sys
+from _typeshed import AnyPath
+from os import stat_result
+from typing import Optional, Sequence, Union, overload
+
+_FdOrAnyPath = Union[int, AnyPath]
+
+async def stat(path: _FdOrAnyPath, *, dir_fd: Optional[int] = ..., follow_symlinks: bool = ...) -> stat_result: ...
+async def rename(src: AnyPath, dst: AnyPath, *, src_dir_fd: Optional[int] = ..., dst_dir_fd: Optional[int] = ...) -> None: ...
+async def remove(path: AnyPath, *, dir_fd: Optional[int] = ...) -> None: ...
+async def mkdir(path: AnyPath, mode: int = ..., *, dir_fd: Optional[int] = ...) -> None: ...
+async def rmdir(path: AnyPath, *, dir_fd: Optional[int] = ...) -> None: ...
+
+if sys.platform != "win32":
+    @overload
+    async def sendfile(__out_fd: int, __in_fd: int, offset: Optional[int], count: int) -> int: ...
+    @overload
+    async def sendfile(
+        __out_fd: int,
+        __in_fd: int,
+        offset: int,
+        count: int,
+        headers: Sequence[bytes] = ...,
+        trailers: Sequence[bytes] = ...,
+        flags: int = ...,
+    ) -> int: ...

third_party/3/aiofiles/base.pyi

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+from types import CodeType, FrameType, TracebackType, coroutine
+from typing import Any, Coroutine, Generator, Generic, Iterator, Optional, Type, TypeVar, Union
+
+_T_co = TypeVar("_T_co", covariant=True)
+_V_co = TypeVar("_V_co", covariant=True)
+_T_contra = TypeVar("_T_contra", contravariant=True)
+
+class AsyncBase:
+    def __init__(self, file: str, loop: Any, executor: Any) -> None: ...
+    async def __aiter__(self) -> Iterator[str]: ...
+    async def __anext__(self) -> str: ...
+
+class AiofilesContextManager(Generic[_V_co, _T_co, _T_contra]):
+    def __init__(self, __coro: Coroutine[_V_co, _T_co, _T_contra]) -> None: ...
+    def send(self, __value: _T_contra) -> _T_co: ...
+    def throw(
+        self, __typ: Type[BaseException], __val: Union[BaseException, object] = ..., tb: Optional[TracebackType] = ...,
+    ) -> _T_co: ...
+    def close(self) -> None: ...
+    @property
+    def gi_frame(self) -> FrameType: ...
+    @property
+    def gi_running(self) -> bool: ...
+    @property
+    def gi_code(self) -> CodeType: ...
+    def __next__(self) -> _T_co: ...
+    @coroutine
+    def __iter__(self) -> Iterator[Coroutine[_V_co, _T_co, _T_contra]]: ...
+    def __await__(self) -> Generator[Any, None, _T_co]: ...
+    async def __anext__(self) -> Coroutine[_V_co, _T_co, _T_contra]: ...
+    async def __aenter__(self) -> Coroutine[_V_co, _T_co, _T_contra]: ...
+    async def __aexit__(
+        self, exc_type: Optional[Type[BaseException]], exc_val: Optional[BaseException], exc_tb: Optional[TracebackType],
+    ) -> None: ...

third_party/3/aiofiles/threadpool/__init__.pyi

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+from _typeshed import AnyPath, OpenBinaryMode, OpenBinaryModeReading, OpenBinaryModeUpdating, OpenBinaryModeWriting, OpenTextMode
+from typing import Any, Callable, Optional, Union, overload
+from typing_extensions import Literal
+
+from ..base import AsyncBase
+from .binary import AsyncBufferedIOBase, AsyncBufferedReader, AsyncFileIO
+from .text import AsyncTextIOWrapper
+
+_OpenFile = Union[AnyPath, int]
+_Opener = Callable[[str, int], int]
+@overload
+def open(
+    file: _OpenFile,
+    mode: OpenTextMode = ...,
+    buffering: int = ...,
+    encoding: Optional[str] = ...,
+    errors: Optional[str] = ...,
+    newline: Optional[str] = ...,
+    closefd: bool = ...,
+    opener: Optional[_Opener] = ...,
+    *,
+    loop: Optional[Any] = ...,
+    executor: Optional[Any] = ...,
+) -> AsyncTextIOWrapper: ...
+@overload
+def open(
+    file: _OpenFile,
+    mode: OpenBinaryMode,
+    buffering: Literal[0],
+    encoding: None = ...,
+    errors: None = ...,
+    newline: None = ...,
+    closefd: bool = ...,
+    opener: Optional[_Opener] = ...,
+    *,
+    loop: Optional[Any] = ...,
+    executor: Optional[Any] = ...,
+) -> AsyncFileIO: ...
+@overload
+def open(
+    file: _OpenFile,
+    mode: OpenBinaryModeWriting,
+    buffering: Literal[-1, 1] = ...,
+    encoding: None = ...,
+    errors: None = ...,
+    newline: None = ...,
+    closefd: bool = ...,
+    opener: Optional[_Opener] = ...,
+    *,
+    loop: Optional[Any] = ...,
+    executor: Optional[Any] = ...,
+) -> AsyncBufferedIOBase: ...
+@overload
+def open(
+    file: _OpenFile,
+    mode: Union[OpenBinaryModeReading, OpenBinaryModeUpdating],
+    buffering: Literal[-1, 1] = ...,
+    encoding: None = ...,
+    errors: None = ...,
+    newline: None = ...,
+    closefd: bool = ...,
+    opener: Optional[_Opener] = ...,
+    *,
+    loop: Optional[Any] = ...,
+    executor: Optional[Any] = ...,
+) -> AsyncBufferedReader: ...
+@overload
+def open(
+    file: _OpenFile,
+    mode: OpenBinaryMode,
+    buffering: int,
+    encoding: None = ...,
+    errors: None = ...,
+    newline: None = ...,
+    closefd: bool = ...,
+    opener: Optional[_Opener] = ...,
+    *,
+    loop: Optional[Any] = ...,
+    executor: Optional[Any] = ...,
+) -> AsyncBase: ...

third_party/3/aiofiles/threadpool/binary.pyi

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+from ..base import AsyncBase
+
+class AsyncBufferedIOBase(AsyncBase): ...
+class AsyncBufferedReader(AsyncBufferedIOBase): ...
+class AsyncFileIO(AsyncBase): ...

third_party/3/aiofiles/threadpool/text.pyi

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+from ..base import AsyncBase
+
+class AsyncTextIOWrapper(AsyncBase): ...