Stripped down example: I have a list of bucket in

buckets

variables, and I want to generate the string:

["arn:aws:s3:::${bucket1.id}", "arn:aws:s3:::${bucket2.id}",...]

I believe this should work.

pulumi.all(buckets.map(b => b.id.apply(id => `arn:aws:s3:::${id}`)))

The upside is that there is ultimately a lot of flexibility, but you are right that these cases can be subtle. We’re looking into a few ways to simplify many common cases further here.

Ha ! I didn't know about

pulumi.all

!

Yes -

Output

is effectively a promise (it is actually a promise along with resource dependency information). Re: launch a function of your own - you can use

.apply(JSON.stringify)

off the previous answer to compute a

Output<string>

.

ok ! I have everything I need now !