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I believe "StackReference" is how you lookup a stack, and then you can retrieve outputs from that stack and determine if hte output exists.

Yes, I can get the outputs from different stacks, but that was not my question. How can I know if a particular output exists or not? Even the nulls that GetOutput returns are Outputs, so I can't use them in an if statement.

unfortunately there isn't a way without having to check within an

apply