diff --git a/third_party/2and3/mypy_extensions.pyi b/third_party/2and3/mypy_extensions.pyi
new file mode 100644
index 000000000..6c57954d8
--- /dev/null
+++ b/third_party/2and3/mypy_extensions.pyi
@@ -0,0 +1,6 @@
+from typing import Dict, Type, TypeVar
+
+T = TypeVar('T')
+
+
+def TypedDict(typename: str, fields: Dict[str, Type[T]]) -> Type[dict]: ...