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how can I get an Output value from StackReference? When I try to use get() on it, there is an error 'Error: Cannot call '.get' during update or preview.', but it doesn't make sense to me, why it's not possible to do that?

have you tried using `.apply(f)`? At update time, f will be called with the realized value. eg: `stackref.apply((actualStackRef) =&gt; { do_something_with(actualStackRef) })`

But the result is still of the type Output, isn't it? So I still can't get the underlying value from it

I just don't understand why it's not possible to get values from the Outputs of another stack (which are already fully known and the start of 'pulumi up')

`Output.apply()` will call the function with the real value

but i'm guessing what you actually mean is "`StackReference.get()` throws an error instead of returning an `Output`)