diff --git a/mesonbuild/modules/keyval.py b/mesonbuild/modules/keyval.py
index 559380ab4..7cebc91bd 100644
--- a/mesonbuild/modules/keyval.py
+++ b/mesonbuild/modules/keyval.py
@@ -13,23 +13,28 @@
 # limitations under the License.
 
 import os
+import typing as T
 
 from . import ExtensionModule
 from .. import mesonlib
-from ..interpreterbase import FeatureNew, noKwargs, InvalidCode
-from ..mesonlib import typeslistify
+from ..interpreterbase import FeatureNew, noKwargs, typed_pos_args
+
+if T.TYPE_CHECKING:
+    from ..interpreter import Interpreter
+    from . import ModuleState
 
 class KeyvalModule(ExtensionModule):
 
     @FeatureNew('Keyval Module', '0.55.0')
-    def __init__(self, *args, **kwargs):
-        super().__init__(*args, **kwargs)
+    def __init__(self, interp: 'Interpreter'):
+        super().__init__(interp)
         self.methods.update({
             'load': self.load,
         })
 
-    def _load_file(self, path_to_config):
-        result = dict()
+    @staticmethod
+    def _load_file(path_to_config: str) -> T.Dict[str, str]:
+        result: T.Dict[str, str] = {}
         try:
             with open(path_to_config, encoding='utf-8') as f:
                 for line in f:
@@ -48,12 +53,9 @@ class KeyvalModule(ExtensionModule):
         return result
 
     @noKwargs
-    def load(self, state, args, kwargs):
-        sources = typeslistify(args, (str, mesonlib.File))
-        if len(sources) != 1:
-            raise InvalidCode('load takes only one file input.')
-
-        s = sources[0]
+    @typed_pos_args('keyval.laod', (str, mesonlib.File))
+    def load(self, state: 'ModuleState', args: T.Tuple['mesonlib.FileOrString'], kwargs: T.Dict[str, T.Any]) -> T.Dict[str, str]:
+        s = args[0]
         is_built = False
         if isinstance(s, mesonlib.File):
             is_built = is_built or s.is_built
@@ -67,5 +69,5 @@ class KeyvalModule(ExtensionModule):
         return self._load_file(s)
 
 
-def initialize(*args, **kwargs):
-    return KeyvalModule(*args, **kwargs)
+def initialize(interp: 'Interpreter') -> KeyvalModule:
+    return KeyvalModule(interp)