interpreterobjects: Add TypedDict annoations for `extract_search_dirs`

This allows for more accurate type checking

mesonbuild/interpreter/interpreterobjects.py

@@ -62,7 +62,7 @@ def extract_required_kwarg(kwargs: 'kwargs.ExtractRequired',
 
     return disabled, required, feature
 
-def extract_search_dirs(kwargs: T.Dict[str, T.Any]) -> T.List[str]:
+def extract_search_dirs(kwargs: 'kwargs.ExtractSearchDirs') -> T.List[str]:
     search_dirs_str = mesonlib.stringlistify(kwargs.get('dirs', []))
     search_dirs = [Path(d).expanduser() for d in search_dirs_str]
     for d in search_dirs:

mesonbuild/interpreter/kwargs.py

@@ -72,6 +72,16 @@ class ExtractRequired(TypedDict):
     required: T.Union[bool, coredata.UserFeatureOption]
 
 
+class ExtractSearchDirs(TypedDict):
+
+    """Keyword arguments consumed by the `extract_search_dirs` function.
+
+    See the not in `ExtractRequired`
+    """
+
+    dirs: T.List[str]
+
+
 class FuncGenerator(TypedDict):
 
     """Keyword rguments for the generator function."""