This symbol is a type alias.
Source:
JsonableType = Union[
bool,
float,
int,
tfx.utils.json_utils.Jsonable,
google.protobuf.message.Message,
str,
Type,
ForwardRef('JsonableType'),
list[Union[bool, float, int, tfx.utils.json_utils.Jsonable, google.protobuf.message.Message, str, Type, ForwardRef('JsonableType')]],
dict[str, Union[bool, float, int, tfx.utils.json_utils.Jsonable, google.protobuf.message.Message, str, Type, ForwardRef('JsonableType'), list[Union[bool, float, int, tfx.utils.json_utils.Jsonable, google.protobuf.message.Message, str, Type, ForwardRef('JsonableType')]]]]
]