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Today, you will have to "go async" to do this. That unfortunately can be complex depending on your use case. You can get a

Promise<string[]>

like this:

async function getSubnetIds(vpcId: string): Promise<string[]> {
    const res = await aws.ec2.getSubnetIds({ vpcId: "123" });
    return res.ids;
}

But then if you want to loop over these in your code, you'll need to write that loop inside an

async

function or a

then

callback on the promise. For stack exports - the code you shared above works for me as written - and produces:

+ subnetIds: {
      + id   : "vpc-c93b06ae"
      + ids  : [
      +     [0]: "subnet-00412149"
      +     [1]: "subnet-fd19eaa6"
      +     [2]: "subnet-ba4009dd"
      +     [3]: "subnet-8a599ba1"
        ]
      + vpcId: "vpc-c93b06ae"
    }

let me create a more stripped down repro -

vpcId

is from config so there's a bit of complex that it picks up along the way

Ahh - yes. I believe you can do:

export let ccsubnetIds;
if ( config.createVpc == false ) {
    ccsubnetIds = pulumi.concat(aws.ec2.getSubnetIds({ vpcId: vpcId, }));
}

async function getSubnetIds(vpcId: string): Promise<string[]> {
    const res = await aws.ec2.getSubnetIds({ vpcId: vpcId });
    return res.ids;
};
export const subnetIds = getSubnetIds(config.vpcId!);

let vpc2_manual = awsx.ec2.Vpc.fromExistingIds("vpc2_manual", {
        vpcId: vpcId,
        // this doesnt get populated automatically, and -fargateservice- only reads this from cluster.vpc.[pubic|private]....
        publicSubnetIds: subnetIds
        // privateSubnetIds: ...
});

is the consumer attempt and

publicSubnetIds: subnetIds

returns:

error TS2740: Type 'Promise<string[]>' is missing the following properties from type 'Input<string>[]': length, pop, push, concat, and 26 more.

Ahh - I see. That is subtle - in that the

publicSubnetIds

property is apparently

Input<string>[]

instead of

Input<string[]>

. I believe you will truly have to "go async" here. That is - put all of your code that creates resources dependent on these subnets inside an asynchronous callback. Possibly by putting it all inside a function which you only call from inside a

then

or

async

function. Note that we're exploring being able to expose synchronous versions of these

get*

methods to significantly simplify this in the future - see https://github.com/pulumi/pulumi-terraform/issues/387.

that would be nice. anything that can be done to make this easier is positive! for now, I've bailed on this and I'm just having to feed these in manually through config after human extraction.