fix: Remove lazy loading of vertexai.types module to enable from vertexai.types import TypeName

PiperOrigin-RevId: 834811652

Author: sararob

vertexai/__init__.py

@@ -44,14 +44,6 @@ def __getattr__(name):  # type: ignore[no-untyped-def]
             _genai_client = importlib.import_module("._genai.client", __name__)
         return getattr(_genai_client, name)
 
-    if name == "types":
-        global _genai_types
-        if _genai_types is None:
-            _genai_types = importlib.import_module("._genai.types", __name__)
-        if "vertexai.types" not in sys.modules:
-            sys.modules["vertexai.types"] = _genai_types
-        return _genai_types
-
     raise AttributeError(f"module '{__name__}' has no attribute '{name}'")
 
 

vertexai/_genai/types.py

@@ -0,0 +1,35 @@
+# Copyright 2025 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+"""A proxy module for lazy-loading the vertexai.types module."""
+
+import importlib
+import sys
+
+_LAZY_LOADED_TYPES_MODULE = "google.cloud.aiplatform.vertexai._genai.types"
+
+_module = None
+
+
+# PEP 562: Lazy loading of submodules
+def __getattr__(name: str):
+    """Lazily load attributes from the `types` module."""
+    global _module
+    if _module is None:
+        _module = importlib.import_module(_LAZY_LOADED_TYPES_MODULE)
+        # After the first access, we replace this proxy module with the real module
+        # in sys.modules. This makes subsequent imports faster.
+        sys.modules[__name__] = _module
+
+    return getattr(_module, name)