hi all, trying to create some resources inside an AWS VPC defined by another stack. I’m using the

awsx.ec2.Vpc.fromExistingIds()

method but can’t quite figure out how to supply the right IDs. here’s what I’ve got so far:

function toArray<T>(v: T | T[]) {
    return Array.isArray(v) ? v : [v];
}

const cfg = new pulumi.Config();

// Grab the VPC ID from the existing VPC stack
const vpcStack = new pulumi.StackReference(cfg.require("vpcStack"));

// Now create a VPC object from the id
const vpc = awsx.ec2.Vpc.fromExistingIds("vpc", {
    vpcId: vpcStack.getOutput("vpcId"),
    publicSubnetIds: toArray(vpcStack.getOutput("publicSubnetIds"))
});

however when running pulumi up, i get the below error message. I’m pretty new to typescript so my guess is I’m not handling the

Output<T>

type returned from

getOutput()

properly. the output should be an array of subnet IDs, eg:

[
    "subnet-abcdefg123456",
    "subnet-foobah12345",
    "subnet-blahblahblah"
]

however it appears its not making it through properly.

Try

vpcStack.getOutput("publicSubnetIds").apply(toArray)

that gives me a compiler error

That's a good error in a sense that it shows the problem at compile time. It looks like the type of

publicSubnetIds

is not great - it doesn't allow an

Output

. Try

toArray(vpcStack.getOutputSync("publicSubnetIds"))

?

that appears to be working… thanks! I’ll keep going and see what happens