diff --git a/src/textual/_filter.py b/src/textual/_filter.py
index 86ca9858e..3857d6812 100644
--- a/src/textual/_filter.py
+++ b/src/textual/_filter.py
@@ -15,7 +15,6 @@ class LineFilter(ABC):
     @abstractmethod
     def filter(self, segments: list[Segment]) -> list[Segment]:
         """Transform a list of segments."""
-        ...
 
 
 class Monochrome(LineFilter):
diff --git a/src/textual/_types.py b/src/textual/_types.py
index 1dd59297c..60d943963 100644
--- a/src/textual/_types.py
+++ b/src/textual/_types.py
@@ -32,6 +32,5 @@ class EventTarget(Protocol):
         ...
 
 
-MessageHandler = Callable[["Message"], Awaitable]
 Lines = List[List[Segment]]
 CallbackType = Union[Callable[[], Awaitable[None]], Callable[[], None]]
diff --git a/src/textual/_xterm_parser.py b/src/textual/_xterm_parser.py
index c1df3840c..40af686a4 100644
--- a/src/textual/_xterm_parser.py
+++ b/src/textual/_xterm_parser.py
@@ -9,12 +9,12 @@ from . import messages
 from ._ansi_sequences import ANSI_SEQUENCES_KEYS
 from ._parser import Awaitable, Parser, TokenCallback
 from ._types import MessageTarget
+from .keys import KEY_NAME_REPLACEMENTS
+
 
 # When trying to determine whether the current sequence is a supported/valid
 # escape sequence, at which length should we give up and consider our search
 # to be unsuccessful?
-from .keys import KEY_NAME_REPLACEMENTS
-
 _MAX_SEQUENCE_SEARCH_THRESHOLD = 20
 
 _re_mouse_event = re.compile("^" + re.escape("\x1b[") + r"(<?[\d;]+[mM]|M...)\Z")
diff --git a/src/textual/actions.py b/src/textual/actions.py
index 118ce2b51..8d3dbdaa2 100644
--- a/src/textual/actions.py
+++ b/src/textual/actions.py
@@ -1,7 +1,6 @@
 from __future__ import annotations
 
 import ast
-from typing import Any, Tuple
 import re
 
 
@@ -41,12 +40,3 @@ def parse(action: str) -> tuple[str, tuple[object, ...]]:
         action_name,
         action_params if isinstance(action_params, tuple) else (action_params,),
     )
-
-
-if __name__ == "__main__":
-
-    print(parse("foo"))
-
-    print(parse("view.toggle('side')"))
-
-    print(parse("view.toggle"))
diff --git a/src/textual/app.py b/src/textual/app.py
index 643ffe2d3..d286dcffe 100644
--- a/src/textual/app.py
+++ b/src/textual/app.py
@@ -11,17 +11,12 @@ from contextlib import redirect_stderr, redirect_stdout
 from datetime import datetime
 from pathlib import Path, PurePath
 from time import perf_counter
-from typing import Any, Generic, Iterable, Iterator, Type, TypeVar, cast, Union
+from typing import Any, Generic, Iterable, Type, TypeVar, cast, Union
 from weakref import WeakSet, WeakValueDictionary
 
 from ._ansi_sequences import SYNC_END, SYNC_START
 from ._path import _make_path_object_relative
 
-if sys.version_info >= (3, 8):
-    from typing import Literal
-else:
-    from typing_extensions import Literal  # pragma: no cover
-
 import nanoid
 import rich
 import rich.repr
@@ -131,7 +126,6 @@ class App(Generic[ReturnType], DOMNode):
         title (str | None, optional): Title of the application. If ``None``, the title is set to the name of the ``App`` subclass. Defaults to ``None``.
         css_path (str | PurePath | None, optional): Path to CSS or ``None`` for no CSS file. Defaults to None.
         watch_css (bool, optional): Watch CSS for changes. Defaults to False.
-
     """
 
     # Inline CSS for quick scripts (generally css_path should be preferred.)
@@ -702,11 +696,6 @@ class App(Generic[ReturnType], DOMNode):
         self._require_stylesheet_update.add(self.screen if node is None else node)
         self.check_idle()
 
-    def update_visible_styles(self) -> None:
-        """Update visible styles only."""
-        self._require_stylesheet_update.update(self.screen.visible_widgets)
-        self.check_idle()
-
     def mount(self, *anon_widgets: Widget, **widgets: Widget) -> None:
         """Mount widgets. Widgets specified as positional args, or keywords args. If supplied
         as keyword args they will be assigned an id of the key.
diff --git a/src/textual/css/parse.py b/src/textual/css/parse.py
index c9ba19fd2..b26f171db 100644
--- a/src/textual/css/parse.py
+++ b/src/textual/css/parse.py
@@ -2,7 +2,7 @@ from __future__ import annotations
 
 from functools import lru_cache
 from pathlib import PurePath
-from typing import Iterator, Iterable, NoReturn, Sequence
+from typing import Iterator, Iterable, NoReturn
 
 from rich import print
 
diff --git a/src/textual/css/styles.py b/src/textual/css/styles.py
index 76bc76371..d59bea2f6 100644
--- a/src/textual/css/styles.py
+++ b/src/textual/css/styles.py
@@ -67,7 +67,6 @@ else:
     from typing_extensions import TypedDict
 
 if TYPE_CHECKING:
-    from .._animator import Animation
     from .._layout import Layout
     from ..dom import DOMNode
 
diff --git a/src/textual/css/tokenizer.py b/src/textual/css/tokenizer.py
index 15dc90508..51c8bf622 100644
--- a/src/textual/css/tokenizer.py
+++ b/src/textual/css/tokenizer.py
@@ -13,7 +13,6 @@ from rich.syntax import Syntax
 from rich.text import Text
 
 from ._error_tools import friendly_list
-from .._loop import loop_last
 
 
 class TokenError(Exception):
diff --git a/src/textual/drivers/linux_driver.py b/src/textual/drivers/linux_driver.py
index 23fd24c12..eb8cd95ea 100644
--- a/src/textual/drivers/linux_driver.py
+++ b/src/textual/drivers/linux_driver.py
@@ -17,7 +17,6 @@ if TYPE_CHECKING:
 import rich.repr
 
 from .. import log
-from .. import events
 from ..driver import Driver
 from ..geometry import Size
 from .._types import MessageTarget