diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 08442b6..d2a462e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -48,7 +48,7 @@ jobs:
               - 'Dockerfile'
               - '.github/workflows/ci.yml'
 
-  lint:
+  format_and_lint:
     timeout-minutes: 3
     runs-on: ubuntu-latest
 
@@ -95,7 +95,7 @@ jobs:
       - name: Install dependencies
         run: |
           source .venv/bin/activate
-          poetry install --no-root --with format
+          poetry install --no-root --with format,lint
 
       - name: Check for successful installation
         run: |
@@ -106,3 +106,8 @@ jobs:
         run: |
           source .venv/bin/activate
           poetry run python tasks/format.py --dry-run
+
+      - name: Format and lint project
+        run: |
+          source .venv/bin/activate
+          poetry run mypy
diff --git a/README.md b/README.md
index e3b4f7d..b555560 100644
--- a/README.md
+++ b/README.md
@@ -129,3 +129,9 @@ poetry run pytest -rfsxE --capture=no --log-cli-level=DEBUG --maxfail=1 -vv ./te
 ```bash
 poetry run python ./tasks/format.py
 ```
+
+#### Code Linting
+
+```bash
+poetry run mypy
+```
diff --git a/poetry.lock b/poetry.lock
index 15599cd..f8aaf15 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,4 +1,4 @@
-# This file is automatically @generated by Poetry 2.3.2 and should not be changed by hand.
+# This file is automatically @generated by Poetry 2.3.4 and should not be changed by hand.
 
 [[package]]
 name = "colorama"
@@ -56,6 +56,107 @@ files = [
     {file = "iniconfig-2.3.0.tar.gz", hash = "sha256:c76315c77db068650d49c5b56314774a7804df16fee4402c1f19d6d15d8c4730"},
 ]
 
+[[package]]
+name = "librt"
+version = "0.9.0"
+description = "Mypyc runtime library"
+optional = false
+python-versions = ">=3.9"
+groups = ["lint"]
+markers = "platform_python_implementation != \"PyPy\""
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+    {file = "librt-0.9.0.tar.gz", hash = "sha256:a0951822531e7aee6e0dfb556b30d5ee36bbe234faf60c20a16c01be3530869d"},
+]
+
 [[package]]
 name = "mss"
 version = "10.1.0"
@@ -73,6 +174,86 @@ dev = ["build (==1.3.0)", "mypy (==1.17.1)", "ruff (==0.12.9)", "twine (==6.1.0)
 docs = ["shibuya (==2025.7.24)", "sphinx (==8.2.3)", "sphinx-copybutton (==0.5.2)", "sphinx-new-tab-link (==0.8.0)"]
 tests = ["numpy (==2.2.4) ; sys_platform == \"linux\" and python_version == \"3.13\"", "pillow (==11.3.0) ; sys_platform == \"linux\" and python_version == \"3.13\"", "pytest (==8.4.1)", "pytest-cov (==6.2.1)", "pytest-rerunfailures (==15.1)", "pyvirtualdisplay (==3.0) ; sys_platform == \"linux\""]
 
+[[package]]
+name = "mypy"
+version = "1.20.1"
+description = "Optional static typing for Python"
+optional = false
+python-versions = ">=3.10"
+groups = ["lint"]
+files = [
+    {file = "mypy-1.20.1-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:3ba5d1e712ada9c3b6223dcbc5a31dac334ed62991e5caa17bcf5a4ddc349af0"},
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+    {file = "mypy-1.20.1-cp314-cp314t-musllinux_1_2_x86_64.whl", hash = "sha256:e364926308b3e66f1361f81a566fc1b2f8cd47fc8525e8136d4058a65a4b4f02"},
+    {file = "mypy-1.20.1-cp314-cp314t-win_amd64.whl", hash = "sha256:a0c17fbd746d38c70cbc42647cfd884f845a9708a4b160a8b4f7e70d41f4d7fa"},
+    {file = "mypy-1.20.1-cp314-cp314t-win_arm64.whl", hash = "sha256:db2cb89654626a912efda69c0d5c1d22d948265e2069010d3dde3abf751c7d08"},
+    {file = "mypy-1.20.1-py3-none-any.whl", hash = "sha256:1aae28507f253fe82d883790d1c0a0d35798a810117c88184097fe8881052f06"},
+    {file = "mypy-1.20.1.tar.gz", hash = "sha256:6fc3f4ecd52de81648fed1945498bf42fa2993ddfad67c9056df36ae5757f804"},
+]
+
+[package.dependencies]
+librt = {version = ">=0.8.0", markers = "platform_python_implementation != \"PyPy\""}
+mypy_extensions = ">=1.0.0"
+pathspec = ">=1.0.0"
+typing_extensions = ">=4.6.0"
+
+[package.extras]
+dmypy = ["psutil (>=4.0)"]
+faster-cache = ["orjson"]
+install-types = ["pip"]
+mypyc = ["setuptools (>=50)"]
+native-parser = ["ast-serialize (>=0.1.1,<1.0.0)"]
+reports = ["lxml"]
+
+[[package]]
+name = "mypy-extensions"
+version = "1.1.0"
+description = "Type system extensions for programs checked with the mypy type checker."
+optional = false
+python-versions = ">=3.8"
+groups = ["lint"]
+files = [
+    {file = "mypy_extensions-1.1.0-py3-none-any.whl", hash = "sha256:1be4cccdb0f2482337c4743e60421de3a356cd97508abadd57d47403e94f5505"},
+    {file = "mypy_extensions-1.1.0.tar.gz", hash = "sha256:52e68efc3284861e772bbcd66823fde5ae21fd2fdb51c62a211403730b916558"},
+]
+
 [[package]]
 name = "numpy"
 version = "2.4.4"
@@ -188,6 +369,24 @@ files = [
     {file = "packaging-26.0.tar.gz", hash = "sha256:00243ae351a257117b6a241061796684b084ed1c516a08c48a3f7e147a9d80b4"},
 ]
 
+[[package]]
+name = "pathspec"
+version = "1.0.4"
+description = "Utility library for gitignore style pattern matching of file paths."
+optional = false
+python-versions = ">=3.9"
+groups = ["lint"]
+files = [
+    {file = "pathspec-1.0.4-py3-none-any.whl", hash = "sha256:fb6ae2fd4e7c921a165808a552060e722767cfa526f99ca5156ed2ce45a5c723"},
+    {file = "pathspec-1.0.4.tar.gz", hash = "sha256:0210e2ae8a21a9137c0d470578cb0e595af87edaa6ebf12ff176f14a02e0e645"},
+]
+
+[package.extras]
+hyperscan = ["hyperscan (>=0.7)"]
+optional = ["typing-extensions (>=4)"]
+re2 = ["google-re2 (>=1.1)"]
+tests = ["pytest (>=9)", "typing-extensions (>=4.15)"]
+
 [[package]]
 name = "pillow"
 version = "12.2.0"
@@ -4107,13 +4306,37 @@ files = [
     {file = "six-1.17.0.tar.gz", hash = "sha256:ff70335d468e7eb6ec65b95b99d3a2836546063f63acc5171de367e834932a81"},
 ]
 
+[[package]]
+name = "types-psutil"
+version = "7.2.2.20260408"
+description = "Typing stubs for psutil"
+optional = false
+python-versions = ">=3.10"
+groups = ["lint"]
+files = [
+    {file = "types_psutil-7.2.2.20260408-py3-none-any.whl", hash = "sha256:0c334f6f6bc9e9c24fca5c7d1f0b6971c961a0a2e3956dc5ce704722c01f9762"},
+    {file = "types_psutil-7.2.2.20260408.tar.gz", hash = "sha256:e8053450685965b8cd52afb62569073d00ea9967ae78bb45dff5f606847f97f2"},
+]
+
+[[package]]
+name = "types-pynput"
+version = "1.8.1.20260408"
+description = "Typing stubs for pynput"
+optional = false
+python-versions = ">=3.10"
+groups = ["lint"]
+files = [
+    {file = "types_pynput-1.8.1.20260408-py3-none-any.whl", hash = "sha256:1c581052b88be85e45b71bd5e8cbcfdfb613a2b45d583af367da3f6a89745c36"},
+    {file = "types_pynput-1.8.1.20260408.tar.gz", hash = "sha256:25ac9ab16c2cd23d9a8eea80dc46a1a733291fdaa0b6cbd24c21b0f28944b73e"},
+]
+
 [[package]]
 name = "typing-extensions"
 version = "4.15.0"
 description = "Backported and Experimental Type Hints for Python 3.9+"
 optional = false
 python-versions = ">=3.9"
-groups = ["main"]
+groups = ["main", "lint"]
 files = [
     {file = "typing_extensions-4.15.0-py3-none-any.whl", hash = "sha256:f0fa19c6845758ab08074a0cfa8b7aecb71c999ca73d62883bc25cc018c4e548"},
     {file = "typing_extensions-4.15.0.tar.gz", hash = "sha256:0cea48d173cc12fa28ecabc3b837ea3cf6f38c6d1136f85cbaaf598984861466"},
@@ -4122,4 +4345,4 @@ files = [
 [metadata]
 lock-version = "2.1"
 python-versions = ">=3.14"
-content-hash = "450d3333d9c283a1657fa171877faf34cf92fefd556da033fa2f8e33ffefb9d5"
+content-hash = "1d970670845a18862e13496d6edf5f48f498231ea4e6996cabf8e71699fb0e64"
diff --git a/pyproject.toml b/pyproject.toml
index 06cd489..675e622 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -24,6 +24,11 @@ test = [
 format = [
     "ruff (>=0.15.7,<0.16.0)"
 ]
+lint = [
+    "mypy (>=1.20.1,<2.0.0)",
+    "types-pynput (>=1.8.1.20260408,<2.0.0.0)",
+    "types-psutil (>=7.2.2.20260408,<8.0.0.0)"
+]
 
 
 [tool.poetry]
@@ -31,6 +36,13 @@ packages = [
     { include = "visiongui", from = "src" }
 ]
 
+[tool.mypy]
+files = ["src"]
+mypy_path = 'src'
+explicit_package_bases = true
+strict = true
+exclude = '(\.venv|build|dist)'
+
 [build-system]
 requires = ["poetry-core>=2.0.0,<3.0.0"]
 build-backend = "poetry.core.masonry.api"
diff --git a/src/visiongui/__init__.py b/src/visiongui/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/src/visiongui/driver/DesktopDriverInterface.py b/src/visiongui/driver/DesktopDriverInterface.py
index f1c6d87..2312921 100644
--- a/src/visiongui/driver/DesktopDriverInterface.py
+++ b/src/visiongui/driver/DesktopDriverInterface.py
@@ -1,3 +1,4 @@
+import re
 import subprocess
 from abc import ABC, abstractmethod
 
@@ -11,11 +12,11 @@
 class DesktopDriverInterface(ABC):
     @property
     @abstractmethod
-    def process(self) -> subprocess.Popen | None: ...
+    def process(self) -> subprocess.Popen[bytes] | None: ...
 
     @process.setter
     @abstractmethod
-    def process(self, value: subprocess.Popen | None) -> None: ...
+    def process(self, value: subprocess.Popen[bytes] | None) -> None: ...
 
     @property
     @abstractmethod
@@ -26,22 +27,22 @@ def window(self) -> pywinctl.Window | None: ...
     def window(self, value: pywinctl.Window | None) -> None: ...
 
     @abstractmethod
-    def launch_process(self, *, cmd: list[str]) -> subprocess.Popen: ...
+    def launch_process(self, *, cmd: list[str]) -> subprocess.Popen[bytes]: ...
 
     @abstractmethod
     def find_window(
         self,
         *,
-        title,
-        timeout: float,
+        title: re.Pattern[str],
+        timeout: int,
     ) -> pywinctl.Window: ...
 
     @abstractmethod
     def wait_for_window_to_disappear(
         self,
         *,
-        title,
-        timeout: float,
+        title: re.Pattern[str],
+        timeout: int,
     ) -> None: ...
 
     @abstractmethod
@@ -59,10 +60,10 @@ def find_element_by_image(
         self,
         *,
         image_path: str,
-        timeout: float,
+        timeout: int,
         log_image_name: str,
-        margin_of_error: float,
-        time_held_stable_on_screen: float,
+        margin_of_error: int,
+        time_held_stable_on_screen: int,
         debug_output_base_path: str,
         match_with_color: bool = False,
     ) -> DesktopElementInterface: ...
diff --git a/src/visiongui/driver/DesktopDriverWindowsImplementation.py b/src/visiongui/driver/DesktopDriverWindowsImplementation.py
index 72559e6..652abc7 100644
--- a/src/visiongui/driver/DesktopDriverWindowsImplementation.py
+++ b/src/visiongui/driver/DesktopDriverWindowsImplementation.py
@@ -1,3 +1,4 @@
+import re
 import subprocess
 
 import pywinctl
@@ -19,16 +20,16 @@
 
 
 class DesktopDriverWindowsImplementation(DesktopDriverInterface):
-    def __init__(self):
-        self._process: subprocess.Popen | None = None
+    def __init__(self) -> None:
+        self._process: subprocess.Popen[bytes] | None = None
         self._window: pywinctl.Window | None = None
 
     @property
-    def process(self) -> subprocess.Popen | None:
+    def process(self) -> subprocess.Popen[bytes] | None:
         return self._process
 
     @process.setter
-    def process(self, value: subprocess.Popen | None) -> None:
+    def process(self, value: subprocess.Popen[bytes] | None) -> None:
         self._process = value
 
     @property
@@ -39,15 +40,15 @@ def window(self) -> pywinctl.Window | None:
     def window(self, value: pywinctl.Window | None) -> None:
         self._window = value
 
-    def launch_process(self, *, cmd: list[str]) -> subprocess.Popen:
+    def launch_process(self, *, cmd: list[str]) -> subprocess.Popen[bytes]:
         self.process = launch_process(cmd=cmd)
         return self.process
 
     def find_window(
         self,
         *,
-        title,
-        timeout: float,
+        title: re.Pattern[str],
+        timeout: int,
     ) -> pywinctl.Window:
         return find_window(
             title=title,
@@ -57,8 +58,8 @@ def find_window(
     def wait_for_window_to_disappear(
         self,
         *,
-        title,
-        timeout: float,
+        title: re.Pattern[str],
+        timeout: int,
     ) -> None:
         return wait_for_window_to_disappear(
             title=title,
@@ -69,10 +70,10 @@ def find_element_by_image(
         self,
         *,
         image_path: str,
-        timeout: float,
+        timeout: int,
         log_image_name: str,
-        margin_of_error: float,
-        time_held_stable_on_screen: float,
+        margin_of_error: int,
+        time_held_stable_on_screen: int,
         debug_output_base_path: str,
         match_with_color: bool = False,
     ) -> DesktopElementInterface:
diff --git a/src/visiongui/driver/close.py b/src/visiongui/driver/close.py
index 52e37dc..b6d2d1f 100644
--- a/src/visiongui/driver/close.py
+++ b/src/visiongui/driver/close.py
@@ -16,7 +16,11 @@ def close(
     if not isinstance(driver, DesktopDriverInterface):
         raise TypeError("Expected driver to be an instance of DesktopDriver")
 
-    pid = driver.window.getPID()
+    window = driver.window
+    pid = None
+    if window is not None:
+        pid = window.getPID()
+
     logger.debug(f"Forcefully killing process owning the window: {pid}")
     proc = psutil.Process(pid)
     proc.terminate()
diff --git a/src/visiongui/driver/find_element_by_image.py b/src/visiongui/driver/find_element_by_image.py
index 61674d6..2a47bc6 100644
--- a/src/visiongui/driver/find_element_by_image.py
+++ b/src/visiongui/driver/find_element_by_image.py
@@ -1,6 +1,7 @@
 import logging
 import os
 import time
+from typing import Callable
 
 import cv2
 import numpy as np
@@ -23,18 +24,22 @@
 logger = logging.getLogger(__name__)
 
 
-def _is_stable(get_current_location, timeout, time_held_stable_on_screen):
+def _is_stable(
+    get_current_location: Callable[[], DesktopElementImplementation | bool],
+    timeout: int,
+    time_held_stable_on_screen: int,
+) -> DesktopElementImplementation:
     start_time = time.time()
-    last_location = None
+    last_location: DesktopElementImplementation | None = None
     stable_start = None
     found_once = False
 
     while time.time() - start_time < timeout:
         current_location = get_current_location()
-        if current_location:
+        if isinstance(current_location, DesktopElementImplementation):
             found_once = True
             if (
-                last_location
+                last_location is not None
                 and current_location.top_left == last_location.top_left
                 and current_location.bottom_right == last_location.bottom_right
             ):
@@ -60,7 +65,13 @@ def _is_stable(get_current_location, timeout, time_held_stable_on_screen):
     raise ExceptionElementNotFound(timeout=timeout)
 
 
-def _match_template(template, margin_of_error, monitor, screen_image, mask=None):
+def _match_template(
+    template: np.ndarray,
+    margin_of_error: float,
+    monitor: dict[str, int],
+    screen_image: np.ndarray,
+    mask: np.ndarray | None = None,
+) -> DesktopElementImplementation | bool:
     # Ensure screen image has same number of channels as template
     if len(template.shape) == 2:
         if len(screen_image.shape) == 3:
@@ -109,11 +120,11 @@ def _match_template(template, margin_of_error, monitor, screen_image, mask=None)
 
 def find_element_by_image(
     image_path: str,
-    timeout: float,
+    timeout: int,
     log_image_name: str,
     debug_output_base_path: str,
     margin_of_error: float,
-    time_held_stable_on_screen: float,
+    time_held_stable_on_screen: int,
     match_with_color: bool = False,
 ) -> DesktopElementImplementation:
     if not image_path or not os.path.isfile(image_path):
@@ -121,6 +132,9 @@ def find_element_by_image(
 
     # [68566fb0-e936-48e3-8c87-c5b8735567df] If the image has an alpha channel, extract it to build a binary mask. This mask ensures that only opaque regions of the template are matched, ignoring transparent padding.
     image = cv2.imread(image_path, cv2.IMREAD_UNCHANGED)
+    if image is None:
+        raise ValueError(f"Unable to read image at {image_path}")
+
     mask = None
     template = None
     if len(image.shape) == 3 and image.shape[2] == 4:
@@ -154,7 +168,7 @@ def find_element_by_image(
         with mss() as sct:
             monitor = sct.monitors[1]
 
-            def get_current_location():
+            def get_current_location() -> DesktopElementImplementation | bool:
                 screenshot = sct.grab(monitor)
                 screen_image = np.array(screenshot)
                 return _match_template(
@@ -173,10 +187,12 @@ def get_current_location():
                 )
                 return result
             try:
-                result = WebDriverWait(timeout).until(
+                wait_result = WebDriverWait(timeout).until(
                     condition=get_current_location,
                 )
-                return result
+                if not isinstance(wait_result, DesktopElementImplementation):
+                    raise ExceptionElementNotFound(timeout=timeout)
+                return wait_result
             except ExceptionTimeout:
                 save_debug_screenshot(
                     image_file_name_prefix=FileNamePrefix.FAIL,
diff --git a/src/visiongui/driver/find_window.py b/src/visiongui/driver/find_window.py
index 1fde219..cf10cee 100644
--- a/src/visiongui/driver/find_window.py
+++ b/src/visiongui/driver/find_window.py
@@ -10,8 +10,8 @@
 logger = logging.getLogger(__name__)
 
 
-def _get_matching_window(title: re.Pattern) -> pywinctl.Window | None:
-    all_windows = pywinctl.getAllWindows()
+def _get_matching_window(title: re.Pattern[str]) -> pywinctl.Window | None:
+    all_windows = pywinctl.getAllWindows()  # type: ignore[no-untyped-call]
     titles = [window.title for window in all_windows if window.title.strip()]
     logger.debug(f"Checking all window titles: {titles}")
 
@@ -25,8 +25,8 @@ def _get_matching_window(title: re.Pattern) -> pywinctl.Window | None:
 
 
 def find_window(
-    title: re.Pattern,
-    timeout: float,
+    title: re.Pattern[str],
+    timeout: int,
 ) -> pywinctl.Window:
     def _window_check() -> pywinctl.Window | None:
         return _get_matching_window(title)
diff --git a/src/visiongui/driver/launch_process.py b/src/visiongui/driver/launch_process.py
index c4b7c59..55e305f 100644
--- a/src/visiongui/driver/launch_process.py
+++ b/src/visiongui/driver/launch_process.py
@@ -2,7 +2,7 @@
 import subprocess
 
 
-def launch_process(cmd: list[str]) -> subprocess.Popen:
+def launch_process(cmd: list[str]) -> subprocess.Popen[bytes]:
     if not cmd:
         raise ValueError("Command list must not be empty")
 
diff --git a/src/visiongui/driver/save_debug_screenshot.py b/src/visiongui/driver/save_debug_screenshot.py
index 95e6ffa..992164f 100644
--- a/src/visiongui/driver/save_debug_screenshot.py
+++ b/src/visiongui/driver/save_debug_screenshot.py
@@ -15,7 +15,7 @@ def save_debug_screenshot(
     image_file_name_prefix: FileNamePrefix,
     log_image_name: str,
     debug_output_base_path: str,
-):
+) -> None:
     file_binary = take_screenshot()
     file_name = f"{image_file_name_prefix.value}_{int(time.time())}_{os.path.basename(log_image_name)}.png"
     save_file(
diff --git a/src/visiongui/driver/switch_to.py b/src/visiongui/driver/switch_to.py
index be65f9c..20e74c0 100644
--- a/src/visiongui/driver/switch_to.py
+++ b/src/visiongui/driver/switch_to.py
@@ -4,8 +4,11 @@
 
 
 def _set_foreground_hwnd(hwnd: int) -> None:
-    user32 = ctypes.WinDLL("user32", use_last_error=True)
-    kernel32 = ctypes.WinDLL("kernel32", use_last_error=True)
+    if platform.system() != "Windows":
+        raise RuntimeError("This function is only supported on Windows")
+
+    user32 = ctypes.WinDLL("user32", use_last_error=True)  # type: ignore[attr-defined]
+    kernel32 = ctypes.WinDLL("kernel32", use_last_error=True)  # type: ignore[attr-defined]
     GetForegroundWindow = user32.GetForegroundWindow
     GetWindowThreadProcessId = user32.GetWindowThreadProcessId
     GetCurrentThreadId = kernel32.GetCurrentThreadId
diff --git a/src/visiongui/driver/wait.py b/src/visiongui/driver/wait.py
index 7aca356..c05855f 100644
--- a/src/visiongui/driver/wait.py
+++ b/src/visiongui/driver/wait.py
@@ -1,18 +1,21 @@
 import time
 from collections.abc import Callable
+from typing import TypeVar
 
 from visiongui.driver.exception import ExceptionTimeout
 
+T = TypeVar("T")
+
 
 class WebDriverWait:
-    def __init__(self, timeout: float, poll_frequency: float = 0.1):
+    def __init__(self, timeout: int, poll_frequency: float = 0.1):
         self.timeout = timeout
         self.poll_frequency = poll_frequency
 
     def until(
         self,
-        condition: Callable[[], object],
-    ):
+        condition: Callable[[], T],
+    ) -> T:
         end_time = time.time() + self.timeout
         while True:
             try:
diff --git a/src/visiongui/driver/wait_for_window_to_disappear.py b/src/visiongui/driver/wait_for_window_to_disappear.py
index 11c3b55..a5bbe1b 100644
--- a/src/visiongui/driver/wait_for_window_to_disappear.py
+++ b/src/visiongui/driver/wait_for_window_to_disappear.py
@@ -11,8 +11,8 @@
 
 
 def wait_for_window_to_disappear(
-    title: re.Pattern,
-    timeout: float,
+    title: re.Pattern[str],
+    timeout: int,
 ) -> None:
     def _window_check() -> bool:
         return _get_matching_window(title) is None
diff --git a/src/visiongui/element/action_type.py b/src/visiongui/element/action_type.py
index d576816..4cef454 100644
--- a/src/visiongui/element/action_type.py
+++ b/src/visiongui/element/action_type.py
@@ -34,5 +34,4 @@ def action_type(
         wait = WebDriverWait(timeout=2)
         wait.until(
             condition=lambda: web_element.get_text() == text_to_type,
-            error_message=f"Element text did not match expected '{text_to_type}' after typing",
         )
diff --git a/src/visiongui/element/click_overlay.py b/src/visiongui/element/click_overlay.py
index 8f10729..0e6e9a3 100644
--- a/src/visiongui/element/click_overlay.py
+++ b/src/visiongui/element/click_overlay.py
@@ -1,5 +1,6 @@
 import threading
 import tkinter as tk
+from typing import cast
 
 from visiongui.element.ClickOverlayOptions import (
     ClickOverlayOptions,
@@ -7,7 +8,7 @@
 
 
 def click_overlay(x: int, y: int, options: ClickOverlayOptions) -> None:
-    def _show():
+    def _show() -> None:
         overlay = tk.Tk()
         overlay.overrideredirect(True)
         overlay.attributes("-topmost", True)
@@ -40,7 +41,7 @@ def _show():
         shaft_bottom_right = (mid_x + shaft_half_width, arrow_height)
         shaft_bottom_left = (mid_x - shaft_half_width, arrow_height)
 
-        points = [
+        points: list[tuple[float, float]] = [
             arrowhead_tip,
             arrowhead_left,
             shaft_top_left,
@@ -51,7 +52,10 @@ def _show():
         ]
 
         canvas.create_polygon(
-            [tuple(round(coord) for coord in point) for point in points],
+            cast(
+                list[tuple[int, int]],
+                [tuple(round(coord) for coord in point) for point in points],
+            ),
             fill=options.fill_color,
             outline=options.border_color,
             width=options.border_width,
diff --git a/src/visiongui/fixture_voltar_ao_vscode.py b/src/visiongui/fixture_voltar_ao_vscode.py
index c6d4213..62b8a94 100644
--- a/src/visiongui/fixture_voltar_ao_vscode.py
+++ b/src/visiongui/fixture_voltar_ao_vscode.py
@@ -5,9 +5,10 @@
 )
 
 
-def voltar_ao_vscode(desktop_driver: DesktopDriverInterface):
+def voltar_ao_vscode(desktop_driver: DesktopDriverInterface) -> None:
     desktop_window = desktop_driver.find_window(
         title=re.compile("Visual Studio Code$"),
         timeout=2,
     )
+    assert desktop_window is not None
     desktop_driver.switch_to(target_window=desktop_window)