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Guessing that is `pulumi.Output&lt;pulumi.Output&lt;string&gt;[]&gt;`

helps to `import {Output} from '@pulumi/pulumi'` to shorten it up

oh yes, stack.getOutput returns `Output&lt;any&gt;`, I was thinking Input types

That results in a similar message:
```
TS2740: Type 'Output&lt;Output&lt;string&gt;[]&gt;' is missing the following properties from type 'Input&lt;string&gt;[]': length, pop, push, concat, and 26 more.
```

Fairly certain the type is Output&lt;string[]&gt; from `getOutput`. If I do
```
myStack.getOutput("subnetIds").apply(x =&gt; { console.log(x); return x;})```
`x` is printed as an array.

I think the `getOutput` return type is overly vague since it could be one of many.  It could possibly be parameterized to allow a return type, like `getOutput&lt;string[]&gt;` to provide a better dev experience.  As-is it is a cast either way to what you want to use.

FWIW, I'm trying to create a vpc from the output:
```
let subnetIds = myStack.getOutput("subnetIds") as pulumi.Output&lt;string[]&gt;;
const vpc = awsx.ec2.Vpc.fromExistingIds("infra-vpc", {
    vpcId: vpcId,
    publicSubnetIds: subnetIds,
});
```
and the error is on the `publicSubnetIds` line.

I can convert it to a `Output&lt;Output&lt;string&gt;[]&gt;` but `publicSubnetIds` doesn't like that either.

I would love to help you.  And i will!  But i'm oof for a few days.

However, let me say this: you should never have Outputs in other Outputs

You can have `Input&lt;Input&lt;string&gt;[]&gt;`

you could also have `Output&lt;string[]&gt;`

do go from the former to the latter, you just call `pulumi.output(the_inputs)`