yaml.serialize_all(..., stream) overload

same as for dump_all()

Author: pmhahn

third_party/2and3/yaml/__init__.pyi

@@ -20,7 +20,12 @@ def load_all(stream: Union[str, IO[str]], Loader=...) -> Iterator[Any]: ...
 def safe_load(stream: Union[str, IO[str]]) -> Any: ...
 def safe_load_all(stream: Union[str, IO[str]]) -> Iterator[Any]: ...
 def emit(events, stream=..., Dumper=..., canonical=..., indent=..., width=..., allow_unicode=..., line_break=...): ...
-def serialize_all(nodes, stream=..., Dumper=..., canonical=..., indent=..., width=..., allow_unicode=..., line_break=..., encoding=..., explicit_start=..., explicit_end=..., version=..., tags=...): ...
+
+@overload
+def serialize_all(nodes, stream: None=..., Dumper=..., canonical=..., indent=..., width=..., allow_unicode=..., line_break=..., encoding=..., explicit_start=..., explicit_end=..., version=..., tags=...) -> AnyStr: ...
+@overload
+def serialize_all(nodes, stream: IO[str], Dumper=..., canonical=..., indent=..., width=..., allow_unicode=..., line_break=..., encoding=..., explicit_start=..., explicit_end=..., version=..., tags=...) -> None: ...
+
 def serialize(node, stream=..., Dumper=..., **kwds): ...
 
 @overload