ResourceOptions.dependsOn only accepts Resources and not Output<Resource>

[swgillespie]

Working through the issues in pulumi/pulumi-cloud#404 discovered that it's not possible to use Output<Resource> with dependsOn, since there is no way to get an Output's list of resource dependencies. We may want to consider allowing Output<Resource> for dependsOn so that this works correctly.

[brandonbloom]

I just ran in to this. Assumed it would work, but got scolded by tsc. I ran in to this because I was using another Output's apply method to get a parameter for a resource.

[brandonbloom]

Also just figured out a workaround: Use another apply call.

[brandonbloom]

Now that I have a bit more experience, a warning for onlookers: Additional apply calls makes preview less useful. It's advisable to avoid creating resources in apply for that reason.

[brandonbloom]

Here's another workaround that depends on internals:

let outputDeps = <T>(output: pulumi.Output<T>) => {
  return (<any>output).resources() as Iterable<pulumi.Resource>;
};

You can use it like:

{dependsOn: [...outputDeps(someOutput)]}