how do I use a

Promise

as an

input

in pulumi? Example I want to use:

get privateSubnetIds(): Promise<pulumi.Output<string>[]>;

from a `Vpc`:

const vpc = new awsx.ec2.Vpc(..., {
  ...
});

in a `NetworkAssociation`:

const networkAssociation = new aws.ec2clientvpn.NetworkAssociation(`...`, {
      subnetId: vpc.privateSubnetIds[0],
  });

A Promise is an Input without doing anything. The issue here is probably that this Promise is wrapping another Output. What problem are you seeing, and what code is it happening in?

yep that seems to be the case. How would I unwrap the Promise? The code sample is above. I'm creating a new VPC, and then trying to use its

privateSubnetIds[0]

as an input in a

clientvpn

NetworkAssociation

There's a couple of ways. I recommend doing everything you can to avoid creating any resource in an

apply()

or

then()

, so let's do that.

yup! That more or less ended up working!!

const defaultPrivateSubnetId = pulumi
      .output(vpc.privateSubnetIds)
      .apply((ids) => ids[0]);

    const defaultPrivateSubnetCidrBlock = pulumi
      .output(vpc.privateSubnets)
      .apply((subnet) => subnet[0].subnet.cidrBlock);

 const networkAssociation = new aws.ec2clientvpn.NetworkAssociation(
      `${name}-network-association`,
      {
        clientVpnEndpointId: endpoint.id,
        subnetId: defaultPrivateSubnetId,
      },
    );

    // allows the following subnet groups to access these subnets
    const authorizationRule = new aws.ec2clientvpn.AuthorizationRule(
      `${name}-authorization-rule`,
      {
        clientVpnEndpointId: endpoint.id,
        targetNetworkCidr: defaultPrivateSubnetCidrBlock,
        authorizeAllGroups: true,
      },
    );

Do you need this?

const defaultPrivateSubnetId = pulumi.output(vpc.privateSubnetIds).apply((ids) => ids[0]);

If you do it inline (i.e., eliminate the

defaultPrivateSubnetId

variable), then I think that Pulumi's output promotion will handle it for you.

subnetId: pulumi.output(vpc.privateSubnetIds)[0]

Hopefully awsx will return an output version of all those promises, at some point in the future.

yeah! that worked 🙂 thanks!