Hello all. I am writing a script that will create a GCP Cloud Storage bucket for each tenant fetched as an output from another stack. The script looks like this:

import * as pulumi from "@pulumi/pulumi";
import { Output } from "@pulumi/pulumi";
import * as gcp from "@pulumi/gcp";

export = async () => {
	const environment = pulumi.getStack();
	const clusterConfig = new pulumi.StackReference(`xyz/cluster-config/${environment}`);
	const tenantIds = await clusterConfig.requireOutput("tenantIds").apply(value => value as string[]);
	const config = new pulumi.Config();
	const project = config.require('project');
	const location = config.require('location');
	const storageClass = config.require('storageClass');

	const bucketUrls = new Array();;

	for (let tenantId of tenantIds) {
		const tenantName = tenantId.split('-')[0];
		const bucketName = `xyz-${environment}-${tenantId}`;
		const bucket = new gcp.storage.Bucket(bucketName, {
			name: bucketName,
			project,
			location,
			storageClass,
			labels: {
				'tenant': tenantName,
				'env': environment,
			},
		});
		bucketUrls.push(bucket.url);
	}

	return {
		bucketUrls
	};
};

However, when I run

pulumi up

I get this error:

index.ts(16,23): error TS2488: Type 'Output<string[]>' must have a '[Symbol.iterator]()' method that returns an iterator

because of this line:

const tenantIds = await clusterConfig.requireOutput("tenantIds").apply(value => value as string[]);

What’s the proper way to convert

Ouptput<any>

to

string[]

and iterate the list of strings?

Try `pulumi.interpolate`My string with {output}``

I am probably missing something here, but I fail to see how

interpolate

can help me here.

Sorry, I dashed that message off a bit quickly, and it's not right at all! It's been a while since I've used the Nodejs SDK, but I (now) think the issue lies in what you're casting. Try casting the

Output<any>

to

Output<string[]>

first, like so:

const tenantIds = await clusterConfig.requireOutput("tenantIds") as Output<string[]>

tenantIds.apply(ids => {
  // ...
  for (let tenantId of ids) {
    // ...
  }
}

Okay, thank you!

Note that if you do that with this code, you'll be creating buckets inside an apply, which is almost certainly not what you want.

Thank you @little-cartoon-10569. I ended up using

requireOutputValue

.