diff -r 7a80a614c9e5 -r a9faacdc5943 mercurial/win32.py
--- a/mercurial/win32.py	Thu Dec 15 15:46:25 2022 -0500
+++ b/mercurial/win32.py	Thu Dec 15 18:02:55 2022 -0500
@@ -14,6 +14,13 @@
 import random
 import subprocess
 
+from typing import (
+    List,
+    NoReturn,
+    Optional,
+    Tuple,
+)
+
 from . import (
     encoding,
     pycompat,
@@ -356,7 +363,7 @@
 _kernel32.PeekNamedPipe.restype = _BOOL
 
 
-def _raiseoserror(name):
+def _raiseoserror(name: bytes) -> NoReturn:
     # Force the code to a signed int to avoid an 'int too large' error.
     # See https://bugs.python.org/issue28474
     code = _kernel32.GetLastError()
@@ -368,7 +375,7 @@
     )
 
 
-def _getfileinfo(name):
+def _getfileinfo(name: bytes) -> _BY_HANDLE_FILE_INFORMATION:
     fh = _kernel32.CreateFileA(
         name,
         0,
@@ -389,7 +396,7 @@
         _kernel32.CloseHandle(fh)
 
 
-def checkcertificatechain(cert, build=True):
+def checkcertificatechain(cert: bytes, build: bool = True) -> bool:
     """Tests the given certificate to see if there is a complete chain to a
     trusted root certificate.  As a side effect, missing certificates are
     downloaded and installed unless ``build=False``.  True is returned if a
@@ -439,7 +446,7 @@
         _crypt32.CertFreeCertificateContext(certctx)
 
 
-def oslink(src, dst):
+def oslink(src: bytes, dst: bytes) -> None:
     try:
         if not _kernel32.CreateHardLinkA(dst, src, None):
             _raiseoserror(src)
@@ -447,12 +454,12 @@
         _raiseoserror(src)
 
 
-def nlinks(name):
+def nlinks(name: bytes) -> int:
     '''return number of hardlinks for the given file'''
     return _getfileinfo(name).nNumberOfLinks
 
 
-def samefile(path1, path2):
+def samefile(path1: bytes, path2: bytes) -> bool:
     '''Returns whether path1 and path2 refer to the same file or directory.'''
     res1 = _getfileinfo(path1)
     res2 = _getfileinfo(path2)
@@ -463,14 +470,14 @@
     )
 
 
-def samedevice(path1, path2):
+def samedevice(path1: bytes, path2: bytes) -> bool:
     '''Returns whether path1 and path2 are on the same device.'''
     res1 = _getfileinfo(path1)
     res2 = _getfileinfo(path2)
     return res1.dwVolumeSerialNumber == res2.dwVolumeSerialNumber
 
 
-def peekpipe(pipe):
+def peekpipe(pipe) -> int:
     handle = msvcrt.get_osfhandle(pipe.fileno())  # pytype: disable=module-attr
     avail = _DWORD()
 
@@ -485,14 +492,14 @@
     return avail.value
 
 
-def lasterrorwaspipeerror(err):
+def lasterrorwaspipeerror(err) -> bool:
     if err.errno != errno.EINVAL:
         return False
     err = _kernel32.GetLastError()
     return err == _ERROR_BROKEN_PIPE or err == _ERROR_NO_DATA
 
 
-def testpid(pid):
+def testpid(pid: int) -> bool:
     """return True if pid is still running or unable to
     determine, False otherwise"""
     h = _kernel32.OpenProcess(_PROCESS_QUERY_INFORMATION, False, pid)
@@ -506,7 +513,7 @@
     return _kernel32.GetLastError() != _ERROR_INVALID_PARAMETER
 
 
-def executablepath():
+def executablepath() -> bytes:
     '''return full path of hg.exe'''
     size = 600
     buf = ctypes.create_string_buffer(size + 1)
@@ -520,7 +527,7 @@
     return buf.value
 
 
-def getvolumename(path):
+def getvolumename(path: bytes) -> Optional[bytes]:
     """Get the mount point of the filesystem from a directory or file
     (best-effort)
 
@@ -541,7 +548,7 @@
     return buf.value
 
 
-def getfstype(path):
+def getfstype(path: bytes) -> Optional[bytes]:
     """Get the filesystem type name from a directory or file (best-effort)
 
     Returns None if we are unsure. Raises OSError on ENOENT, EPERM, etc.
@@ -572,7 +579,7 @@
     return name.value
 
 
-def getuser():
+def getuser() -> bytes:
     '''return name of current user'''
     size = _DWORD(300)
     buf = ctypes.create_string_buffer(size.value + 1)
@@ -581,10 +588,10 @@
     return buf.value
 
 
-_signalhandler = []
+_signalhandler: List[_SIGNAL_HANDLER] = []
 
 
-def setsignalhandler():
+def setsignalhandler() -> None:
     """Register a termination handler for console events including
     CTRL+C. python signal handlers do not work well with socket
     operations.
@@ -601,7 +608,7 @@
         raise ctypes.WinError()  # pytype: disable=module-attr
 
 
-def hidewindow():
+def hidewindow() -> None:
     def callback(hwnd, pid):
         wpid = _DWORD()
         _user32.GetWindowThreadProcessId(hwnd, ctypes.byref(wpid))
@@ -614,7 +621,7 @@
     _user32.EnumWindows(_WNDENUMPROC(callback), pid)
 
 
-def termsize():
+def termsize() -> Tuple[int, int]:
     # cmd.exe does not handle CR like a unix console, the CR is
     # counted in the line length. On 80 columns consoles, if 80
     # characters are written, the following CR won't apply on the
@@ -635,7 +642,7 @@
     return width, height
 
 
-def enablevtmode():
+def enablevtmode() -> bool:
     """Enable virtual terminal mode for the associated console.  Return True if
     enabled, else False."""
 
@@ -661,7 +668,7 @@
     return True
 
 
-def spawndetached(args):
+def spawndetached(args: List[bytes]) -> int:
     # No standard library function really spawns a fully detached
     # process under win32 because they allocate pipes or other objects
     # to handle standard streams communications. Passing these objects
@@ -703,7 +710,7 @@
     return pi.dwProcessId
 
 
-def unlink(f):
+def unlink(f: bytes) -> None:
     '''try to implement POSIX' unlink semantics on Windows'''
 
     if os.path.isdir(f):
@@ -758,7 +765,7 @@
             pass
 
 
-def makedir(path, notindexed):
+def makedir(path: bytes, notindexed: bool) -> None:
     os.mkdir(path)
     if notindexed:
         _kernel32.SetFileAttributesA(path, _FILE_ATTRIBUTE_NOT_CONTENT_INDEXED)