diff --git a/kittens/runner.py b/kittens/runner.py
index 5bf42b70f..b7d214473 100644
--- a/kittens/runner.py
+++ b/kittens/runner.py
@@ -6,7 +6,6 @@
 import importlib
 import os
 import sys
-from contextlib import suppress
 from functools import partial
 
 aliases = {'url_hints': 'hints'}
@@ -99,9 +98,11 @@ def run_kitten(kitten, run_name='__main__'):
     original_kitten_name = kitten
     kitten = resolved_kitten(kitten)
     set_debug(kitten)
-    with suppress(ImportError):
+    try:
         runpy.run_module('kittens.{}.main'.format(kitten), run_name=run_name)
         return
+    except ImportError:
+        pass
     # Look for a custom kitten
     if not kitten.endswith('.py'):
         kitten += '.py'
diff --git a/kittens/tui/operations.py b/kittens/tui/operations.py
index 2da16dd1f..d585f345f 100644
--- a/kittens/tui/operations.py
+++ b/kittens/tui/operations.py
@@ -63,8 +63,8 @@ def beep() -> str:
     return '\a'
 
 
-def set_window_title(value) -> str:
-    return ('\033]2;' + value.replace('\033', '').replace('\x9c', '') + '\033\\')
+def set_window_title(value: str) -> str:
+    return '\033]2;' + value.replace('\033', '').replace('\x9c', '') + '\033\\'
 
 
 def set_line_wrapping(yes_or_no: bool) -> str:
@@ -134,7 +134,7 @@ def faint(text) -> str:
     return colored(text, 'black', True)
 
 
-def styled(text, fg=None, bg=None, fg_intense=False, bg_intense=False, italic=None, bold=None, underline=None, underline_color=None, reverse=None) -> str:
+def styled(text: str, fg=None, bg=None, fg_intense=False, bg_intense=False, italic=None, bold=None, underline=None, underline_color=None, reverse=None) -> str:
     start, end = [], []
     if fg is not None:
         start.append(color_code(fg, fg_intense))
@@ -167,7 +167,7 @@ def styled(text, fg=None, bg=None, fg_intense=False, bg_intense=False, italic=No
     return '\033[{}m{}\033[{}m'.format(';'.join(start), text, ';'.join(end))
 
 
-def serialize_gr_command(cmd, payload=None):
+def serialize_gr_command(cmd, payload=None) -> bytes:
     cmd = ','.join('{}={}'.format(k, v) for k, v in cmd.items())
     ans: List[bytes] = []
     w = ans.append
@@ -180,11 +180,11 @@ def serialize_gr_command(cmd, payload=None):
 
 
 def gr_command(cmd, payload=None) -> str:
-    return serialize_gr_command(cmd, payload)
+    return serialize_gr_command(cmd, payload).decode('ascii')
 
 
 def clear_images_on_screen(delete_data=False) -> str:
-    return serialize_gr_command({'a': 'd', 'd': 'A' if delete_data else 'a'})
+    return serialize_gr_command({'a': 'd', 'd': 'A' if delete_data else 'a'}).decode('ascii')
 
 
 def init_state(alternate_screen=True):
@@ -255,8 +255,9 @@ def write_to_clipboard(data, use_primary=False) -> str:
     from base64 import standard_b64encode
     fmt = 'p' if use_primary else 'c'
 
-    def esc(chunk):
+    def esc(chunk: str) -> str:
         return '\x1b]52;{};{}\x07'.format(fmt, chunk)
+
     ans = esc('!')  # clear clipboard buffer
     for chunk in (data[i:i+512] for i in range(0, len(data), 512)):
         chunk = standard_b64encode(chunk).decode('ascii')
diff --git a/kittens/unicode_input/main.py b/kittens/unicode_input/main.py
index ee2d38b61..bc9914936 100644
--- a/kittens/unicode_input/main.py
+++ b/kittens/unicode_input/main.py
@@ -260,11 +260,12 @@ class Table:
             self.layout_dirty = True
 
 
-def is_index(w):
-    with suppress(Exception):
+def is_index(w: str) -> bool:
+    try:
         int(w.lstrip(INDEX_CHAR), 16)
         return True
-    return False
+    except Exception:
+        return False
 
 
 class UnicodeInput(Handler):
diff --git a/kitty/cli.py b/kitty/cli.py
index 72f279846..22a40338a 100644
--- a/kitty/cli.py
+++ b/kitty/cli.py
@@ -674,7 +674,8 @@ type=bool-set
             appname=appname, config_help=CONFIG_HELP.format(appname=appname, conf_name=appname)
 
         ))
-    return getattr(options_spec, 'ans')
+    ans: str = getattr(options_spec, 'ans')
+    return ans
 
 
 def options_for_completion() -> OptionSpecSeq:
@@ -703,7 +704,7 @@ def parse_args(
     usage: Optional[str] = None,
     message: Optional[str] = None,
     appname: Optional[str] = None,
-    result_class: Type[T] = None,
+    result_class: Optional[Type[T]] = None,
 ) -> Tuple[T, List[str]]:
     options = parse_option_spec(ospec())
     seq, disabled = options
diff --git a/kitty/conf/utils.py b/kitty/conf/utils.py
index 281a4546d..e0d74442e 100644
--- a/kitty/conf/utils.py
+++ b/kitty/conf/utils.py
@@ -6,7 +6,10 @@ import os
 import re
 import shlex
 from collections import namedtuple
-from typing import Callable, FrozenSet, List, Optional, Union, Dict, Any, Iterator, Type
+from typing import (
+    Any, Callable, Dict, FrozenSet, Iterator, List, Optional, Sequence, Tuple,
+    Type, Union
+)
 
 from ..rgb import Color, to_color as as_color
 from ..utils import log_error
@@ -56,12 +59,13 @@ def to_cmdline(x: str) -> List[str]:
 
 def python_string(text: str) -> str:
     import ast
-    return ast.literal_eval("'''" + text.replace("'''", "'\\''") + "'''")
+    ans: str = ast.literal_eval("'''" + text.replace("'''", "'\\''") + "'''")
+    return ans
 
 
-def choices(*choices) -> Callable[[str], str]:
-    defval: str = choices[0]
-    uc: FrozenSet[str] = frozenset(choices)
+def choices(*choices: str) -> Callable[[str], str]:
+    defval = choices[0]
+    uc = frozenset(choices)
 
     def choice(x: str) -> str:
         x = x.lower()
@@ -199,13 +203,13 @@ def create_options_class(all_keys: Iterator[str]) -> Type:
     return ans
 
 
-def merge_dicts(defaults, newvals):
+def merge_dicts(defaults: Dict, newvals: Dict) -> Dict:
     ans = defaults.copy()
     ans.update(newvals)
     return ans
 
 
-def resolve_config(SYSTEM_CONF, defconf, config_files_on_cmd_line):
+def resolve_config(SYSTEM_CONF: str, defconf: str, config_files_on_cmd_line: Sequence[str]):
     if config_files_on_cmd_line:
         if 'NONE' not in config_files_on_cmd_line:
             yield SYSTEM_CONF
@@ -217,9 +221,14 @@ def resolve_config(SYSTEM_CONF, defconf, config_files_on_cmd_line):
 
 
 def load_config(
-    Options, defaults, parse_config, merge_configs, *paths, overrides=None
+        Options: Type,
+        defaults: Any,
+        parse_config: Callable[[Iterator[str]], Dict[str, Any]],
+        merge_configs: Callable[[Dict, Dict], Dict],
+        *paths: str,
+        overrides: Optional[Iterator[str]] = None
 ):
-    ans = defaults._asdict()
+    ans: Dict = defaults._asdict()
     for path in paths:
         if not path:
             continue
@@ -235,7 +244,7 @@ def load_config(
     return Options(ans)
 
 
-def init_config(default_config_lines, parse_config):
+def init_config(default_config_lines: Iterator[str], parse_config: Callable):
     defaults = parse_config(default_config_lines, check_keys=False)
     Options = create_options_class(defaults.keys())
     defaults = Options(defaults)
@@ -260,7 +269,7 @@ def key_func():
     return func_with_args, ans
 
 
-def parse_kittens_shortcut(sc):
+def parse_kittens_shortcut(sc: str) -> Tuple[Optional[int], str, bool]:
     from ..key_encoding import config_key_map, config_mod_map, text_match
     if sc.endswith('+'):
         parts = list(filter(None, sc.rstrip('+').split('+') + ['+']))
@@ -282,16 +291,17 @@ def parse_kittens_shortcut(sc):
     tkey = text_match(rkey)
     if tkey is None:
         rkey = rkey.upper()
-        rkey = config_key_map.get(rkey)
-        if rkey is None:
+        q = config_key_map.get(rkey)
+        if q is None:
             raise ValueError('Unknown shortcut key: {}'.format(sc))
+        rkey = q
     else:
         is_text = True
         rkey = tkey
     return mods, rkey, is_text
 
 
-def parse_kittens_func_args(action, args_funcs):
+def parse_kittens_func_args(action: str, args_funcs: Dict[str, Callable]) -> Tuple[str, Tuple[str, ...]]:
     parts = action.strip().split(' ', 1)
     func = parts[0]
     if len(parts) == 1:
@@ -317,10 +327,12 @@ def parse_kittens_func_args(action, args_funcs):
     return func, tuple(args)
 
 
-def parse_kittens_key(val, funcs_with_args):
+def parse_kittens_key(
+    val: str, funcs_with_args: Dict[str, Callable]
+) -> Optional[Tuple[Tuple[str, Tuple[str, ...]], str, Optional[int], bool]]:
     sc, action = val.partition(' ')[::2]
     if not sc or not action:
-        return
+        return None
     mods, key, is_text = parse_kittens_shortcut(sc)
-    action = parse_kittens_func_args(action, funcs_with_args)
-    return action, key, mods, is_text
+    ans = parse_kittens_func_args(action, funcs_with_args)
+    return ans, key, mods, is_text
diff --git a/kitty/config.py b/kitty/config.py
index 0a923b4f7..e8a4f9620 100644
--- a/kitty/config.py
+++ b/kitty/config.py
@@ -483,7 +483,7 @@ def handle_symbol_map(key, val, ans):
 class FontFeature(str):
 
     def __new__(cls, name, parsed):
-        ans = str.__new__(cls, name)  # type: ignore
+        ans = str.__new__(cls, name)
         ans.parsed = parsed
         return ans
 
@@ -624,7 +624,7 @@ actions = frozenset(all_key_actions) | frozenset(
 no_op_actions = frozenset({'noop', 'no-op', 'no_op'})
 
 
-def merge_configs(defaults, vals):
+def merge_configs(defaults: Dict, vals: Dict) -> Dict:
     ans = {}
     for k, v in defaults.items():
         if isinstance(v, dict):
@@ -777,7 +777,7 @@ def finalize_keys(opts: OptionsStub) -> None:
     opts.sequence_map = sequence_map
 
 
-def load_config(*paths: Tuple[str], overrides: Optional[Iterator[str]] = None, accumulate_bad_lines: Optional[List[BadLine]] = None) -> OptionsStub:
+def load_config(*paths: str, overrides: Optional[Iterator[str]] = None, accumulate_bad_lines: Optional[List[BadLine]] = None) -> OptionsStub:
     parser = parse_config
     if accumulate_bad_lines is not None:
         parser = partial(parse_config, accumulate_bad_lines=accumulate_bad_lines)
diff --git a/kitty/launch.py b/kitty/launch.py
index 4bed1bb46..fa8c7439a 100644
--- a/kitty/launch.py
+++ b/kitty/launch.py
@@ -18,7 +18,7 @@ from .tabs import Tab
 try:
     from typing import TypedDict
 except ImportError:
-    TypedDict = Dict[str, Any]  # type: ignore
+    TypedDict = Dict[str, Any]
 
 
 @lru_cache(maxsize=2)
@@ -162,7 +162,7 @@ def get_env(opts: LaunchCLIOptions, active_child: Child) -> Dict[str, str]:
 def tab_for_window(boss: Boss, opts: LaunchCLIOptions, target_tab: Optional[Tab] = None) -> Tab:
     if opts.type == 'tab':
         tm = boss.active_tab_manager
-        tab = tm.new_tab(empty_tab=True, location=opts.location)
+        tab: Tab = tm.new_tab(empty_tab=True, location=opts.location)
         if opts.tab_title:
             tab.set_title(opts.tab_title)
     elif opts.type == 'os-window':
@@ -252,7 +252,7 @@ def launch(boss: Boss, opts: LaunchCLIOptions, args: List[str], target_tab: Opti
             func(kw['stdin'])
     else:
         tab = tab_for_window(boss, opts, target_tab)
-        new_window = tab.new_window(env=env or None, **kw)
+        new_window: Window = tab.new_window(env=env or None, **kw)
         if opts.keep_focus and active:
             boss.set_active_window(active, switch_os_window_if_needed=True)
         return new_window
diff --git a/kitty/layout.py b/kitty/layout.py
index 8e4c93bc5..55ac8df44 100644
--- a/kitty/layout.py
+++ b/kitty/layout.py
@@ -466,7 +466,7 @@ class Layout:  # {{{
 
     def window_independent_borders(self, windows, active_windows):
         return
-        yield
+        yield  # type:ignore
 
     def minimal_borders(self, windows, active_window, needs_borders_map):
         for w in windows:
diff --git a/kitty/rgb.py b/kitty/rgb.py
index d3de81a99..edfb40be4 100644
--- a/kitty/rgb.py
+++ b/kitty/rgb.py
@@ -3,11 +3,14 @@
 # License: GPL v3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
 import re
-from collections import namedtuple
 from contextlib import suppress
-from typing import Optional
+from typing import Optional, NamedTuple
 
-Color = namedtuple('Color', 'red green blue')
+
+class Color(NamedTuple):
+    red: int
+    green: int
+    blue: int
 
 
 def alpha_blend_channel(top_color: int, bottom_color: int, alpha: float) -> int:
diff --git a/kitty/utils.py b/kitty/utils.py
index 528c2cd96..4de5fd7de 100644
--- a/kitty/utils.py
+++ b/kitty/utils.py
@@ -468,17 +468,17 @@ def func_name(f):
 
 
 def resolved_shell(opts: Optional[Options] = None) -> List[str]:
-    ans = getattr(opts, 'shell', '.')
-    if ans == '.':
+    q: str = getattr(opts, 'shell', '.')
+    if q == '.':
         ans = [shell_path]
     else:
         import shlex
-        ans = shlex.split(ans)
+        ans = shlex.split(q)
     return ans
 
 
 def read_shell_environment(opts: Optional[Options] = None) -> Dict[str, str]:
-    ans = getattr(read_shell_environment, 'ans', None)
+    ans: Optional[Dict[str, str]] = getattr(read_shell_environment, 'ans', None)
     if ans is None:
         from .child import openpty, remove_blocking
         ans = {}
@@ -506,7 +506,7 @@ def read_shell_environment(opts: Optional[Options] = None) -> Dict[str, str]:
                     raw += stdout.read()
                 if ret is not None:
                     break
-            if p.returncode is None:
+            if cast(Optional[int], p.returncode) is None:
                 log_error('Timed out waiting for shell to quit while reading shell environment')
                 p.kill()
             elif p.returncode == 0:
diff --git a/setup.cfg b/setup.cfg
index 59ad1dbf9..e5e049b03 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -15,9 +15,11 @@ multi_line_output = 5
 
 [mypy]
 files = kitty,kittens,glfw/glfw.py,*.py
-
-[mypy-kitty.conf.*]
-check_untyped_defs = True
-
-[mypy-kitty.cli]
-check_untyped_defs = True
+no_implicit_optional = True
+sqlite_cache = True
+cache_fine_grained = True
+warn_redundant_casts = True
+warn_unused_ignores = True
+warn_return_any = True
+warn_unreachable = True
+# check_untyped_defs = True