sorry, I mean a pulumi.output

pretty sure there isn't a simple way to "extract" the underlying value from an output. You can do

myOutput.apply(val => {
    console.log(val)
})

inside the apply you can access underlying. However for most pulumi stuff you can just pass outputs to Inputs and everything is dandy

Indeed - as the pinned message in this channel notes:

If your query is related to Output, the answer is generally to use apply. 🙂

This section in the docs has more details: https://www.pulumi.com/docs/intro/concepts/programming-model/#outputs The key point is that an Output may not yet have a value (until a cloud resource has been created or updated), so you cannot just get its value. You need to provide a callback that will run when it’s value does become available (possibly never in the case of a preview).