Really struggling with a stackreference/output typing issue trying to reference an array from my central config stack - my typescript isn't the best. Providing a slightly simplified version of my scenario - tried a bunch of things, including trying to JSON.stringify the output and then parse it back on the other side, but I can't seem to turn it back into an array of strings that I can iterate over: Stack A - Config: Exports a bunch of core GCP config values for use in other stacks like so

export const gcpConfig = {
  regions: config.requireObject<Array<string>>('gcp-regions'),
};

offending config value looks like

myconfig:gcp-regions:
  - us-east1

Stack B - Infra: Utilizes a custom resource that creates a GCP network and a bunch of subnets

const envConfig = new pulumi.StackReference('yadayada');
const gcpConfig = envConfig.getOutput('gcpConfig');
const regions = gcpConfig.apply((v) => v.regions);

Unfortunately I can't figure out any way to manipulate

regions

back into an array of strings I can iterate over. Can someone please help?

I suspect your problem is that you’re trying to convert an Output back to a raw value (list of strings), which isn’t possible.

I need to be able to pass the output into a customresource as an argument and iterate over its values there. If I were iterating over it outside of the resource I'd probably be fine - but I thing a lot of my struggle is figuring out what the type of the arguement for the CR should be. I've been trying

string[]

which obv. doesn't work, and

pulumi.Input<string[]>

but that doesn't give me the ability to apply or iterate. Does it make sense for my custom resource to accept a

pulumi.Output

as an argument? feels wrong, but maybe I'm getting hung up on naming

In this case, you’d likely want a

pulumi.Input<string[]>

, which can handle Outputs as well as raw values. If you need to interact with that value in the custom resource logic, then you can do something like

pulumi.output(myInputValue).apply(x => {...})

Would you not then be trying to create some resources (the ones that uses

const regions

) inside an

.apply()

? That doesn't work, I think?