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You can get the outputs for a stack with `Stack.outputs()` or `LocalWorkspace.stackOutputs()` . You can check the outputs before running `Stack.up()` to achieve what you want.

We generally create a dynamic resource for this.

Here is a gist of our LeastUsedLoadbalancer component which picks the load balancer with the least amount of rules specified from a pool, then uses that.
But after it makes that choice it can’t change

<https://gist.github.com/JakeGinnivan/c40c24b93463ea5949ce441a21a8a0f4>