Fixes typing guard inside classes

src/sphinx_autodoc_typehints/__init__.py

@@ -289,7 +289,12 @@ def _resolve_type_guarded_imports(obj: Any) -> None:
                     for (_, part) in _TYPE_GUARD_IMPORT_RE.findall(module_code):
                         guarded_code = textwrap.dedent(part)
                         try:
-                            exec(guarded_code, obj.__globals__)
+                            # Some objects doesn't have the `__globals__` attribute like
+                            # classes, so we need to check before trying to access it.
+                            if hasattr(guarded_code, "__globals__"):
+                                exec(guarded_code, obj.__globals__)
+                            else:
+                                exec(guarded_code)
                         except Exception as exc:
                             _LOGGER.warning(f"Failed guarded type import with {exc!r}")
 

tests/roots/test-resolve-typing-guard/demo_typing_guard.py

@@ -29,6 +29,15 @@ def a(f: Decimal, s: AnyStr) -> Sequence[AnyStr | Decimal]:
     return [f, s]
 
 
+class SomeClass:
+    """This class do something."""
+
+    if TYPE_CHECKING:  # Classes doesn't have `__globals__` attribute
+
+        def __getattr__(self, attrname: str):
+            """This method do something."""
+
+
 __all__ = [
     "a",
     "ValueError",