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And here's what the code looks like:

```export const loadBalancer = new aws.lb.LoadBalancer("app", {
  internal: false,
  loadBalancerType: "application",
  securityGroups: [securityGroups.allowHttps.id, securityGroups.allowHttp.id],
  subnetMappings: [
    { subnetId: vpc.publicSubnetIds, allocationId: eip.ipAddress.id }
  ]
});```

subnetIds is an array, so you need to specify an index

```export const loadBalancer = new aws.lb.LoadBalancer("app", {
  internal: false,
  loadBalancerType: "application",
  securityGroups: [securityGroups.allowHttps.id, securityGroups.allowHttp.id],
  subnetMappings: [
    { subnetId: vpc.publicSubnetIds[0], allocationId: eip.ipAddress.id }
  ]
});```
eg

```vpc.publicSubnetIds.then(subnetIds =&gt; {
  pulumi.all(subnetIds).apply(subnetIds =&gt; {
    const subnetMappings = subnetIds.map(id =&gt; {
      return {
        subnetId: id,
        allocationId: eip.ipAddress.publicIp
      }
    });

    new awsx.lb.ApplicationLoadBalancer("app", {
      securityGroups: [securityGroups.allowHttps.id, securityGroups.allowHttp.id],
      subnetMappings: subnetMappings
    });
  });
});```

But I just learned you cannot assign elastic ips to application load balancers.

You need a different EIP for each Subnet too - and yeah might need a NLB instead.

If you're using Cloudflare in front, a CNAME/ALIAS should be fine.

Huh, can Cloudflare do that? Going to see.

Is there a way to move the new application load balancer out of the promise?

So that way I can export it from the file?