Is there a way to specify a

typing.Union

return type from an

@op

that doesn’t cause Dagster to raise a

DagsterInvalidDefinitionError

? I have an

op

that should return one of two custom types depending on some of the config passed, but specifying it in the return type signature or

Out(Union[type1, type2])

raises this error. The workaround I found was to define another output type (below) but it feels unnecessary for this type of use case.

type1_or_type2 = DagsterType(
    name="type1_or_type2",
    type_check_fn=lambda _, x: isinstance(x, type1) or isinstance(x, type2),
)