Revert "add configs to validate_arguments (#1378)" (#1662)

This reverts commit e690f0878e.

pydantic/decorator.py

@@ -14,27 +14,20 @@ if TYPE_CHECKING:
     Callable = TypeVar('Callable', bound=AnyCallable)
 
 
-def validate_arguments(func: 'Callable' = None, **config_params: Any) -> 'Callable':
+def validate_arguments(function: 'Callable') -> 'Callable':
     """
     Decorator to validate the arguments passed to a function.
     """
+    vd = ValidatedFunction(function)
 
-    def validate(_func: 'Callable') -> 'Callable':
-        vd = ValidatedFunction(_func, **config_params)
+    @wraps(function)
+    def wrapper_function(*args: Any, **kwargs: Any) -> Any:
+        return vd.call(*args, **kwargs)
 
-        @wraps(_func)
-        def wrapper_function(*args: Any, **kwargs: Any) -> Any:
-            return vd.call(*args, **kwargs)
-
-        wrapper_function.vd = vd  # type: ignore
-        wrapper_function.raw_function = vd.raw_function  # type: ignore
-        wrapper_function.model = vd.model  # type: ignore
-        return cast('Callable', wrapper_function)
-
-    if func:
-        return validate(func)
-    else:
-        return cast('Callable', validate)
+    wrapper_function.vd = vd  # type: ignore
+    wrapper_function.raw_function = vd.raw_function  # type: ignore
+    wrapper_function.model = vd.model  # type: ignore
+    return cast('Callable', wrapper_function)
 
 
 ALT_V_ARGS = 'v__args'
@@ -43,7 +36,7 @@ V_POSITIONAL_ONLY_NAME = 'v__positional_only'
 
 
 class ValidatedFunction:
-    def __init__(self, function: 'Callable', **config_params: Any):
+    def __init__(self, function: 'Callable'):
         from inspect import signature, Parameter
 
         parameters: Mapping[str, Parameter] = signature(function).parameters
@@ -107,7 +100,7 @@ class ValidatedFunction:
             # same with kwargs
             fields[self.v_kwargs_name] = Dict[Any, Any], None
 
-        self.create_model(fields, takes_args, takes_kwargs, **config_params)
+        self.create_model(fields, takes_args, takes_kwargs)
 
     def call(self, *args: Any, **kwargs: Any) -> Any:
         values = self.build_values(args, kwargs)
@@ -177,17 +170,9 @@ class ValidatedFunction:
         else:
             return self.raw_function(**d)
 
-    def create_model(self, fields: Dict[str, Any], takes_args: bool, takes_kwargs: bool, **config_params: Any) -> None:
+    def create_model(self, fields: Dict[str, Any], takes_args: bool, takes_kwargs: bool) -> None:
         pos_args = len(self.arg_mapping)
 
-        if TYPE_CHECKING:
-
-            class CustomConfig:
-                pass
-
-        else:
-            CustomConfig = type('Config', (), config_params)
-
         class DecoratorBaseModel(BaseModel):
             @validator(self.v_args_name, check_fields=False, allow_reuse=True)
             def check_args(cls, v: List[Any]) -> List[Any]:
@@ -211,7 +196,7 @@ class ValidatedFunction:
                 keys = ', '.join(map(repr, v))
                 raise TypeError(f'positional-only argument{plural} passed as keyword argument{plural}: {keys}')
 
-            class Config(CustomConfig):
+            class Config:
                 extra = Extra.forbid
 
         self.model = create_model(to_camel(self.raw_function.__name__), __base__=DecoratorBaseModel, **fields)