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Looks like an import thing:

import {Bucket} from "@pulumi/aws/s3";

, doesn't work, but

import * as aws from "@pulumi/aws";

and subsequently using aws.s3.Bucket does.

I think

import {s3} from "@pulumi/aws"

and then

s3.Bucket

should also work. As you’ve discovered, imports appear to only work at the top level or the module level.