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When it comes to stack references, what are people doing to enforce that an output exists before continuing? From my tests i simply get a `nil` value if I reference an output that doesn't exist.

Also, if I have a folder structure like this:

```root
  infra
  app```
And my `app` project references resources from the `infra` project, is there a way I can `pulumi up` the entire directory rather than running it from the individual folders/projects? Or would I need to look into the automation API for that?

you can check the value inside an `apply` and then exit the program is it's not resolved