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According to the documentation, `Output`s can only be used post-deployment, not as part of a deployment. Are you trying to do the latter? Documentation I'm referencing I pulled from the code for

Output<T>.get(): T

/**
     * Retrieves the underlying value of this dependency.
     *
     * This function is only callable in code that runs in the cloud post-deployment.  At this
     * point all Output values will be known and can be safely retrieved. During pulumi deployment
     * or preview execution this must not be called (and will throw).  This is because doing so
     * would allow Output values to flow into Resources while losing the data that would allow
     * the dependency graph to be changed.
     */

Yes, I want to use the region specified in

Pulumi.dev.yaml

config in the s3 bucket name during creation of pulumi stack. In pulumi/aws v1.x package, we could retrieve it as a string using just

aws.getRegion().name

How do I retrieve and use this value in the latest version?

Hi @agreeable-machine-73141, consider this example:

import * as pulumi from '@pulumi/pulumi';
import * as aws from '@pulumi/aws';
import { interpolate } from '@pulumi/pulumi';

const region = pulumi.output(aws.getRegion({}, { async: true})).name;
const prefix = interpolate`${region}-dev-data`
const devDataBucket = new aws.s3.Bucket('devDataBucket', {
  bucket: prefix
});

Thanks. It worked with some changes.

import * as pulumi from '@pulumi/pulumi';
import * as aws from '@pulumi/aws';
import { interpolate } from '@pulumi/pulumi';

const region = pulumi.output(aws.getRegion({}, { async: true})).name;
const prefix = interpolate`${region}-dev-data`
const devDataBucket = prefix.apply(p => {
  return new aws.s3.Bucket(p, {
    bucket: p
  })
});

The prefix has other qualifiers. I provided a simplified code snippet here.