Add PEP 613 TypeAlias stub to typing_extensions (#4243)

east825 · web-flow · commit 30bbf02cf11a · 2020-06-19T14:49:04.000+02:00
diff --git a/third_party/2and3/typing_extensions.pyi b/third_party/2and3/typing_extensions.pyi
@@ -71,3 +71,6 @@ def get_type_hints(
 
 Annotated: _SpecialForm = ...
 _AnnotatedAlias: Any = ...  # undocumented
+
+# TypeAlias is a (non-subscriptable) special form.
+TypeAlias: object
