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from what I understand, you probably want to use methods like `.apply` that are available in `pulumi.Output` objects

<https://www.pulumi.com/docs/intro/concepts/inputs-outputs/#apply>

if you need to modify the Pulumi Output, you cannot directly operate on it (as you said, `Output&lt;string[]&gt;` is not `string[]`)

however, you can transform it within function passed to `apply` method

This joins an Outout&lt;string[]&gt; to a string[]:
```outputStringArray = outputStringArray.apply(oa =&gt; oa.concat(stringArray));```