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Are you saying that when you use `allowPostgresSgRule` later, its value is possibly undefined? Because it is. You're conditionally creating it.

If env isn't `prod` or tfCCCRdsPostgresSg is falsy, then allowPostgresSgRule will be undefined.

Can I suggest changing that to use more traditional if-statements? Or maybe just not make it conditional? SGs are free, just make it no matter what.