Add import compat layer to __init__

propcache/__init__.py

@@ -1,6 +1,30 @@
 """propcache: An accelerated property cache for Python classes."""
 
+from typing import TYPE_CHECKING, List
+
 __version__ = "1.0.0"
 
 # Imports have moved to `propcache.api` in 1.0.0+.
-__all__ = ()
+# This module is now a facade for the API.
+if TYPE_CHECKING:
+    from .api import cached_property, under_cached_property
+
+__all__ = ("cached_property", "under_cached_property")
+
+
+def _import_facade(attr: str) -> object:
+    """Import the public API from the `api` module."""
+    if attr in __all__:
+        from . import api  # pylint: disable=import-outside-toplevel
+
+        return getattr(api, attr)
+    raise AttributeError(f"module 'propcache' has no attribute '{attr}'")
+
+
+def _dir_facade() -> List[str]:
+    """Include the public API in the module's dir() output."""
+    return [*__all__, *globals().keys()]
+
+
+__getattr__ = _import_facade
+__dir__ = _dir_facade