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Pulumi exports it as a type

import { Region } from "@pulumi/aws";
const region = new pulumi.Config("aws").require('region') as Region

You will run into runtime errors if the region in the config isn't actually a valid region, but this will pass compile checks

Is there a difference/preference between using ‘as’ and specifying the type on the variable? eg:

const region: aws.Region = new pulumi.Config("aws").require('region')

in this specific case, no. both will work fine. though i think what you have above is preferred in most cases