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The publicSubnetIds array is automatically lifted. Don't use `apply()`. `subnetId: vpc.publicSubnetIds[0]` works fine.

I tried but it says `1. Element implicitly has an 'any' type because expression of type '0' can't be used to index type 'Promise&lt;Output&lt;string&gt;[]&gt;'.`
     `Property '0' does not exist on type 'Promise&lt;Output&lt;string&gt;[]&gt;'.`

Ah, that's awsx for you. Promises instead of outputs. Is there an equivalent method / member that gives outputs?

If not, then you can wrap the value in an output. That'll allow Pulumi to lift the values correctly.

I think this should do it?
```subnetId: pulumi.output(vpc.publicSubnetIds)[0]```