MagicStack
diff --git a/.flake8 b/.flake8
@@ -1,3 +1,5 @@
 [flake8]
+select = C90,E,F,W,Y0
 ignore = E402,E731,W503,W504,E252
-exclude = .git,__pycache__,build,dist,.eggs,.github,.local,.venv,.tox
+exclude = .git,__pycache__,build,dist,.eggs,.github,.local,.venv*,.tox
+per-file-ignores = *.pyi: F401, F403, F405, F811, E127, E128, E203, E266, E301, E302, E305, E501, E701, E704, E741, B303, W503, W504
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
@@ -22,7 +22,7 @@ jobs:
         github_token: ${{ secrets.RELEASE_BOT_GITHUB_TOKEN }}
         version_file: asyncpg/_version.py
         version_line_pattern: |
-          __version__\s*=\s*(?:['"])([[:PEP440:]])(?:['"])
+          __version__(?:\s*:\s*typing\.Final)?\s*=\s*(?:['"])([[:PEP440:]])(?:['"])
 
     - name: Stop if not approved
       if: steps.checkver.outputs.approved != 'true'

diff --git a/.gitignore b/.gitignore
@@ -34,3 +34,6 @@ docs/_build
 /.eggs
 /.vscode
 /.mypy_cache
+/.venv*
+/.tox
+/.vim
diff --git a/MANIFEST.in b/MANIFEST.in
@@ -1,5 +1,6 @@
 recursive-include docs *.py *.rst Makefile *.css
 recursive-include examples *.py
 recursive-include tests *.py *.pem
-recursive-include asyncpg *.pyx *.pxd *.pxi *.py *.c *.h
+recursive-include asyncpg *.pyx *.pxd *.pxi *.py *.pyi *.c *.h
 include LICENSE README.rst Makefile performance.png .flake8
+include asyncpg/py.typed
diff --git a/asyncpg/__init__.py b/asyncpg/__init__.py
@@ -4,16 +4,17 @@
 # This module is part of asyncpg and is released under
 # the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
 
+from __future__ import annotations
 
 from .connection import connect, Connection  # NOQA
 from .exceptions import *  # NOQA
 from .pool import create_pool, Pool  # NOQA
 from .protocol import Record  # NOQA
 from .types import *  # NOQA
 
-
+from . import exceptions
 from ._version import __version__  # NOQA
 
 
-__all__ = ('connect', 'create_pool', 'Pool', 'Record', 'Connection')
+__all__ = ['connect', 'create_pool', 'Pool', 'Record', 'Connection']
 __all__ += exceptions.__all__ # NOQA
diff --git a/asyncpg/_asyncio_compat.py b/asyncpg/_asyncio_compat.py
@@ -4,18 +4,28 @@
 #
 # SPDX-License-Identifier: PSF-2.0
 
+from __future__ import annotations
 
 import asyncio
 import functools
 import sys
+import typing
+
+if typing.TYPE_CHECKING:
+    from . import compat
 
 if sys.version_info < (3, 11):
     from async_timeout import timeout as timeout_ctx
 else:
     from asyncio import timeout as timeout_ctx
 
 
-async def wait_for(fut, timeout):
+_T = typing.TypeVar('_T')
+
+
+async def wait_for(
+    fut: compat.Awaitable[_T], timeout: float | None
+) -> _T:
     """Wait for the single Future or coroutine to complete, with timeout.
 
     Coroutine will be wrapped in Task.
@@ -65,7 +75,7 @@ async def wait_for(fut, timeout):
         return await fut
 
 
-async def _cancel_and_wait(fut):
+async def _cancel_and_wait(fut: asyncio.Future[_T]) -> None:
     """Cancel the *fut* future or task and wait until it completes."""
 
     loop = asyncio.get_running_loop()
@@ -82,6 +92,6 @@ async def _cancel_and_wait(fut):
         fut.remove_done_callback(cb)
 
 
-def _release_waiter(waiter, *args):
+def _release_waiter(waiter: asyncio.Future[typing.Any], *args: object) -> None:
     if not waiter.done():
         waiter.set_result(None)
diff --git a/asyncpg/_version.py b/asyncpg/_version.py
@@ -10,4 +10,8 @@
 # supported platforms, publish the packages on PyPI, merge the PR
 # to the target branch, create a Git tag pointing to the commit.
 
-__version__ = '0.30.0.dev0'
+from __future__ import annotations
+
+import typing
+
+__version__: typing.Final = '0.30.0.dev0'
-Original file line number
+Diff line change
@@ Expand Up / @@ -34,3 +34,6 @@ docs/_build @@
     /.eggs
     /.vscode
     /.mypy_cache
+    /.venv*
+    /.tox
+    /.vim