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I believe `getOutput` returns an object of type `Output`

You could either try using `getOutputValue` instead or do `pubsub.apply(value =&gt; { // your code that uses the value[0] here })`

```const pubsub = stackMon.getOutput("publicSubnetIds");

const grafana = pulumi.all(pubsub).apply(([subnet1, subnet2])=&gt; {
        return new k8s.helm.v3.Release("grafana", {
...
                values: {
...
                        ingress: {
...
                                annotations: {
...
                                        '<http://alb.ingress.kubernetes.io/subnets|alb.ingress.kubernetes.io/subnets>': `${subnet1}, ${subnet2}`,
                                },
                        },```
I've removed some static config lines to make it clearer.
Now pubsub is an Output&lt;any&gt; which contains and array of 2 strings, or will contain that at runtime when it's looked up.
and when I try and run this I get
```    index.ts(132,28): error TS2769: No overload matches this call.
      The last overload gave the following error.
        Argument of type 'Output&lt;any&gt;' is not assignable to parameter of type 'unknown[]'.
          Type 'OutputInstance&lt;any&gt;' is missing the following properties from type 'unknown[]': length, pop, push, concat, and 29 more.
    index.ts(132,44): error TS7031: Binding element 'subnet1' implicitly has an 'any' type.
    index.ts(132,53): error TS7031: Binding element 'subnet2' implicitly has an 'any' type.```
any ideas?

`const publicSubnetIds = pubsub.apply(list =&gt; list.join(','));`

Ah no, that gives me
`Calling [toString] on an [Output&lt;T&gt;] is not supported.`

Ok for the sake of anyone who ends up looking for the answer here:
```const pubsub = stackMon.getOutput("publicSubnetIds");
...
const pubsubId = pubsub.apply((l: Array&lt;string&gt;) =&gt; {
        return l.map(a =&gt; `${a}`).join(",");
});
const grafana = new k8s.helm.v3.Release("grafana", {
...
        values: {
                ingress: {
                        annotations: {
                                '<http://alb.ingress.kubernetes.io/subnets|alb.ingress.kubernetes.io/subnets>': pulumi.interpolate `${pubsubId}`,```
Is what actually manages to get the annotation to work :D