diff --git a/plover_platform_specific_translation/config/actions.py b/plover_platform_specific_translation/config/actions.py
index f68b881..20910b2 100644
--- a/plover_platform_specific_translation/config/actions.py
+++ b/plover_platform_specific_translation/config/actions.py
@@ -2,7 +2,10 @@
 Module to handle reading in the application JSON config file.
 """
 from pathlib import Path
-from typing import Tuple
+from typing import (
+    Any,
+    Tuple
+)
 
 from . import file
 
@@ -14,8 +17,9 @@ def load(config_filepath: Path) -> dict[str, Tuple[str, str]]:
 
     Raises an error if the specified config file is not JSON format.
     """
-    data = file.load(config_filepath)
+    data: dict[str, Any] = file.load(config_filepath)
 
+    config_platform_translations: Any
     try:
         config_platform_translations = data["platform_specific_translations"]
     except KeyError:
@@ -24,7 +28,7 @@ def load(config_filepath: Path) -> dict[str, Tuple[str, str]]:
     if not isinstance(config_platform_translations, dict):
         raise ValueError("'platform_specific_translations' must be a dict")
 
-    platform_translations = {
+    platform_translations: dict[str, Tuple[str, str]] = {
         outline_translation: tuple(resolved_translation)
         for outline_translation, resolved_translation
         in config_platform_translations.items()
@@ -39,5 +43,7 @@ def save(
     """
     Saves the set of platform-specific translations to the config JSON file.
     """
-    data = {"platform_specific_translations": platform_translations}
+    data: dict[str, dict[str, Tuple[str, str]]] = {
+        "platform_specific_translations": platform_translations
+    }
     file.save(config_filepath, data)
diff --git a/plover_platform_specific_translation/config/file.py b/plover_platform_specific_translation/config/file.py
index 1f0b78d..d1a24c7 100644
--- a/plover_platform_specific_translation/config/file.py
+++ b/plover_platform_specific_translation/config/file.py
@@ -15,6 +15,7 @@ def load(filepath: Path) -> dict[str, Any]:
 
     Raises an error if the specified config file is not JSON format.
     """
+    data: dict[str, Any]
     try:
         with filepath.open(encoding="utf-8") as file:
             data = json.load(file)
@@ -24,7 +25,7 @@ def load(filepath: Path) -> dict[str, Any]:
     except json.JSONDecodeError as exc:
         raise ValueError("Unable to decode file contents as JSON") from exc
 
-    return data # type: ignore[no-any-return]
+    return data
 
 def save(filepath: Path, data: dict[str, dict[str, Tuple[str, str]]]) -> None:
     """
diff --git a/plover_platform_specific_translation/platform/parser.py b/plover_platform_specific_translation/platform/parser.py
index d468fce..8d13e09 100644
--- a/plover_platform_specific_translation/platform/parser.py
+++ b/plover_platform_specific_translation/platform/parser.py
@@ -6,7 +6,7 @@
 import platform
 
 
-_PLATFORM_MAPPINGS = {
+_PLATFORM_MAPPINGS: dict[str, str] = {
     "Windows": "WINDOWS",
     "Darwin": "MAC",
     "Linux": "LINUX"
diff --git a/plover_platform_specific_translation/translation/resolver.py b/plover_platform_specific_translation/translation/resolver.py
index 09f8a39..2b20675 100644
--- a/plover_platform_specific_translation/translation/resolver.py
+++ b/plover_platform_specific_translation/translation/resolver.py
@@ -4,14 +4,19 @@
 """
 import re
 from typing import (
+    Any,
+    Iterator,
+    Optional,
+    Match,
     Pattern,
-    Tuple
+    Tuple,
+    Union
 )
 
 
-COMBO = "combo"
-COMMAND = "command"
-_TEXT = "text"
+COMBO: str = "combo"
+COMMAND: str = "command"
+_TEXT: str = "text"
 
 # Ignore any colons in commands contained in outline translations.
 _ARGUMENT_DIVIDER: Pattern[str] = re.compile(
@@ -31,8 +36,11 @@ def resolve(platform: str, outline_translation: str) -> Tuple[str, str]:
     """
     Resolves a single translation from a set of platform-specific translations.
     """
-    platform_translations = _parse_outline_translation(outline_translation)
+    platform_translations: dict[str, str] = (
+        _parse_outline_translation(outline_translation)
+    )
 
+    translation: str
     try:
         translation = platform_translations[platform]
     except KeyError:
@@ -43,16 +51,21 @@ def resolve(platform: str, outline_translation: str) -> Tuple[str, str]:
                 f"No translation provided for platform: {platform}"
             ) from exc
 
+    combo_translation: Optional[Match[str]]
     if combo_translation := re.match(_COMBO_TYPE, translation):
         return (COMBO, combo_translation.group(1))
 
+    command_translation: Optional[Match[str]]
     if command_translation := re.match(_COMMAND_TYPE, translation):
         return (COMMAND, command_translation.group(1))
 
     return (_TEXT, translation)
 
 def _parse_outline_translation(outline_translation: str) -> dict[str, str]:
-    it = iter(re.split(_ARGUMENT_DIVIDER, outline_translation))
+    it: Iterator[Union[str, Any]] = iter(
+        re.split(_ARGUMENT_DIVIDER, outline_translation)
+    )
+
     return {
         platform.upper(): translation
         for platform, translation
diff --git a/test/config/test_config.py b/test/config/test_config.py
index 79b54ca..4da9460 100644
--- a/test/config/test_config.py
+++ b/test/config/test_config.py
@@ -61,6 +61,7 @@ def test_loading_valid_config(valid_platform_translations_config_path):
     config_platform_translations = (
         config.load(valid_platform_translations_config_path)
     )
+
     assert (
         config_platform_translations[
             "WINDOWS:Hello:MAC:Hi:LINUX:Good day:OTHER:Whassup"
@@ -74,8 +75,8 @@ def test_saving_config(valid_platform_translations_config_path):
         valid_platform_translations_config_path,
         platform_translations
     )
-
     config_platform_translations = (
         config.load(valid_platform_translations_config_path)
     )
+
     assert config_platform_translations == platform_translations