DiffSync deprecation fix

Author: abates

diffsync/__init__.py

@@ -28,6 +28,7 @@
     Any,
     Set,
 )
+from typing_extensions import deprecated
 import warnings
 
 from pydantic import ConfigDict, BaseModel, PrivateAttr
@@ -894,15 +895,10 @@ def count(self, model: Union[StrType, "DiffSyncModel", Type["DiffSyncModel"], No
         return self.store.count(model=model)
 
 
-def DiffSync(*args: Any, **kwargs: Any) -> Adapter:  # noqa  pylint: disable=invalid-name
+@deprecated("'diffsync.DiffSync' is deprecated and will be removed with 2.1, use 'diffsync.Adapter' instead.")
+class DiffSync(Adapter):
     """For backwards-compatibility, keep around the old name."""
 
-    warnings.warn(
-        "'diffsync.DiffSync' is deprecated and will be removed with 2.1, use 'diffsync.Adapter' instead.",
-        DeprecationWarning,
-    )
-    return Adapter(*args, **kwargs)
-
 
 # DiffSyncModel references Adapter and Adapter references DiffSyncModel. Break the typing loop:
 DiffSyncModel.model_rebuild()

tests/unit/test_deprecation.py

@@ -0,0 +1,10 @@
+
+from diffsync import DiffSync
+
+import pytest
+
+def test_diffsync_deprecation_warning():
+    with pytest.deprecated_call():
+        class TestAdapter(DiffSync):
+            pass
+        TestAdapter()