optional

src/lightning_utilities/core/imports.py

@@ -109,7 +109,9 @@ class RequirementCache:
     False
     """
 
-    def __init__(self, requirement: str, module: Optional[str] = None) -> None:
+    def __init__(self, requirement: Optional[str] = None, module: Optional[str] = None) -> None:
+        if not (requirement or module):
+            raise ValueError("At least one arguments need to be set.")
         self.requirement = requirement
         self.module = module
 
@@ -290,7 +292,7 @@ def requires(*module_path_version: str, raise_exception: bool = True) -> Callabl
 
     def decorator(func: Callable[P, T]) -> Callable[P, T]:
         reqs = [
-            ModuleAvailableCache(mod_ver) if "." in mod_ver else RequirementCache(mod_ver)
+            RequirementCache(module=mod_ver) if "." in mod_ver else RequirementCache(requirement=mod_ver)
             for mod_ver in module_path_version
         ]
         available = all(map(bool, reqs))