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`ec2.Vpc.getSubnets` returns a `Promise&lt;ec2.Subnet[]&gt;`  as opposed to an `Output&lt;ec2.Subnet&gt;[]` . Is this safe to use as an arg (Input) to a subsequent resource where I need to provide a subnet id?

we have the new `ec2.Vpc.getSubnetsOutput` which might be more helpful in this scenario

Ah, doesn't look like it's on my version awsx.Vpc (sorry should've mentioned this is awsx)

and no, you can't pass a promise to an Output, you'll need to await it and then build an output, which won't be fun

yeah sounds like bad things will occur :sweat_smile:

```vpc.id.apply(() =&gt; vpc.publicSubnets)```

wrap in a relateed output to maintain dependency data, return promise to subnets which should resolve _some time after_ vpc.id

What <@U02MP794J9E> suggested worked as a charm :heart:

```const publicSubnetsIds = vpc.id.apply(async () =&gt; vpc.getSubnetsIds("public"));```
and then I use it like this:

```const alb = new aws.lb.LoadBalancer(`${name}-alb`, {
      internal: false,
      loadBalancerType: "application",
      securityGroups: [albSecGroup.id],
      subnets: publicSubnetsIds.apply((ids) =&gt; ids),
    });```
Thanks a bunch, <@U02MP794J9E>!

`publicSubnetsIds.apply((ids) =&gt; ids),` is the same as just `publicSubnetsIds`

Screenshot 2022-03-28 at 20.38.54.png

Screenshot 2022-03-28 at 20.39.21.png

hmhmh, this confuses me

my IDEA says something else:

does this not work?
```const alb = new aws.lb.LoadBalancer(`${name}-alb`, {
      internal: false,
      loadBalancerType: "application",
      securityGroups: [albSecGroup.id],
      subnets: publicSubnetsIds
    });```