Add a with_config decorator to comply with typing spec

pydantic/__init__.py

@@ -19,7 +19,7 @@
     from ._internal._generate_schema import GenerateSchema as GenerateSchema
     from .aliases import AliasChoices, AliasGenerator, AliasPath
     from .annotated_handlers import GetCoreSchemaHandler, GetJsonSchemaHandler
-    from .config import ConfigDict
+    from .config import ConfigDict, with_config
     from .errors import *
     from .fields import Field, PrivateAttr, computed_field
     from .functional_serializers import (
@@ -80,6 +80,7 @@
     'WrapSerializer',
     # config
     'ConfigDict',
+    'with_config',
     # deprecated V1 config, these are imported via `__getattr__` below
     'BaseConfig',
     'Extra',
@@ -234,6 +235,7 @@
     'WrapSerializer': (__package__, '.functional_serializers'),
     # config
     'ConfigDict': (__package__, '.config'),
+    'with_config': (__package__, '.config'),
     # validate call
     'validate_call': (__package__, '.validate_call_decorator'),
     # errors

pydantic/config.py

@@ -1,7 +1,7 @@
 """Configuration for Pydantic models."""
 from __future__ import annotations as _annotations
 
-from typing import TYPE_CHECKING, Any, Callable, Dict, List, Type, Union
+from typing import TYPE_CHECKING, Any, Callable, Dict, List, Type, TypeVar, Union
 
 from typing_extensions import Literal, TypeAlias, TypedDict
 
@@ -11,7 +11,7 @@
 if TYPE_CHECKING:
     from ._internal._generate_schema import GenerateSchema as _GenerateSchema
 
-__all__ = ('ConfigDict',)
+__all__ = ('ConfigDict', 'with_config')
 
 
 JsonValue: TypeAlias = Union[int, float, str, bool, None, List['JsonValue'], 'JsonDict']
@@ -909,4 +909,17 @@ class Model(BaseModel):
     """
 
 
+_TypeT = TypeVar('_TypeT', bound=type)
+
+
+def with_config(config: ConfigDict) -> Callable[[_TypeT], _TypeT]:
+    """A convenience decorator to set a Pydantic configuration on a `TypedDict`."""
+
+    def inner(typed_dict: _TypeT, /) -> _TypeT:
+        setattr(typed_dict, '__pydantic_config__', config)
+        return typed_dict
+
+    return inner
+
+
 __getattr__ = getattr_migration(__name__)

tests/test_types_typeddict.py

@@ -20,6 +20,7 @@
     PositiveInt,
     PydanticUserError,
     ValidationError,
+    with_config,
 )
 from pydantic._internal._decorators import get_attribute_from_bases
 from pydantic.functional_serializers import field_serializer, model_serializer
@@ -919,3 +920,13 @@ class C(B):
         pass
 
     assert get_attribute_from_bases(C, 'x') == 2
+
+
+def test_typeddict_with_config_decorator():
+    @with_config(ConfigDict(str_to_lower=True))
+    class Model(TypedDict):
+        x: str
+
+    ta = TypeAdapter(Model)
+
+    assert ta.validate_python({'x': 'ABC'}) == {'x': 'abc'}