UnionType import fix

src/viser/infra/_typescript_interface_gen.py

@@ -1,6 +1,6 @@
 import dataclasses
+import types
 from collections import defaultdict
-from types import UnionType
 from typing import Any, Type, Union, cast
 
 import numpy as np
@@ -49,6 +49,7 @@ def _get_ts_type(typ: Type[Any]) -> str:
         origin_typ = args[0]
 
     # Automatic Python => TypeScript conversion.
+    UnionType = getattr(types, "UnionType", Union)
     if origin_typ is tuple:
         args = get_args(typ)
         if len(args) == 2 and args[1] == ...: