fix(sglang): give the lazily exported handlers real types

components/src/dynamo/sglang/request_handlers/__init__.py

@@ -2,7 +2,23 @@
 # SPDX-License-Identifier: Apache-2.0
 
 from importlib import import_module
-from typing import Any
+from typing import TYPE_CHECKING, Any
+
+if TYPE_CHECKING:
+    # Declared, not imported at runtime. These mirror `_EXPORTS` below; without
+    # them the module-level `__getattr__` is the only thing that resolves the
+    # handlers, and hiding it from the type checker would make them all look
+    # missing.
+    from .embedding import EmbeddingWorkerHandler
+    from .handler_base import BaseGenerativeHandler, BaseWorkerHandler
+    from .image_diffusion import ImageDiffusionWorkerHandler
+    from .llm import DecodeWorkerHandler, DiffusionWorkerHandler, PrefillWorkerHandler
+    from .multimodal import (
+        MultimodalEncodeWorkerHandler,
+        MultimodalPrefillWorkerHandler,
+        MultimodalWorkerHandler,
+    )
+    from .video_generation import VideoGenerationWorkerHandler
 
 _EXPORTS = {
     # Base handlers
@@ -25,14 +41,22 @@
 }
 
 
-def __getattr__(name: str) -> Any:
-    if name not in _EXPORTS:
-        raise AttributeError(f"module {__name__!r} has no attribute {name!r}")
+# Hidden from the type checker on purpose. A module-level `__getattr__` tells
+# mypy this package may have any attribute, so a typo such as
+# `from ... request_handlers import DecodeWorkerHandlr` would check clean in
+# every module that imports from here, and the real handlers resolve as `Any`.
+# The `TYPE_CHECKING` block above declares them, so the checker gains their
+# actual types and loses nothing.
+if not TYPE_CHECKING:
+
+    def __getattr__(name: str) -> Any:
+        if name not in _EXPORTS:
+            raise AttributeError(f"module {__name__!r} has no attribute {name!r}")
 
-    module = import_module(_EXPORTS[name], __name__)
-    value = getattr(module, name)
-    globals()[name] = value
-    return value
+        module = import_module(_EXPORTS[name], __name__)
+        value = getattr(module, name)
+        globals()[name] = value
+        return value
 
 
 __all__ = [