Added pyi

lark-stubs/ast_utils.pyi

@@ -0,0 +1,17 @@
+import types
+from typing import Optional
+
+from .visitors import Transformer
+
+class Ast(object):
+    pass
+
+class AsList(object):
+    pass
+
+
+def create_transformer(
+        ast_module: types.ModuleType,
+        transformer: Optional[Transformer]=None
+) -> Transformer:
+    ...