ref: Define types at runtime (#2914)

Set types in sentry_sdk.types to None at runtime. This allows the types to be imported from outside if TYPE_CHECKING guards.

Fixes GH-2909

Co-authored-by: Anton Pirker <anton.pirker@sentry.io>
Co-authored-by: anthony sottile <103459774+asottile-sentry@users.noreply.github.com>

sentry_sdk/types.py

@@ -11,6 +11,11 @@
 from typing import TYPE_CHECKING
 
 if TYPE_CHECKING:
-    from sentry_sdk._types import Event, Hint  # noqa: F401
+    from sentry_sdk._types import Event, Hint
+else:
+    # The lines below allow the types to be imported from outside `if TYPE_CHECKING`
+    # guards. The types in this module are only intended to be used for type hints.
+    Event = None
+    Hint = None
 
-    __all__ = ["Event", "Hint"]
+__all__ = ("Event", "Hint")