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Try

vpcStack.getOutput("publicSubnetIds").apply(toArray)

that gives me a compiler error

That's a good error in a sense that it shows the problem at compile time. It looks like the type of

publicSubnetIds

is not great - it doesn't allow an

Output

. Try

toArray(vpcStack.getOutputSync("publicSubnetIds"))

?

that appears to be working… thanks! I’ll keep going and see what happens