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What is the type of `instances`? And are you wanting to write the file to your local machine?

instances is an array of `new aws.ec2.Instance`

Yes, I want to write the file to my local machine

Something like this should work:
```pulumi.all(sshConfigFragments).apply(f =&gt; fs.writeFileSync("~/.ssh/config", f.join("\n\n")));```


You'll have an array of `Output` values that you need to wait on and `pulumi.all` does that. Similar to `Promise.all` . Note that `pulumi` in my snippet is just an import alias for `@pulumi/pulumi`.

...and `fs` is an import alias for Node's native `fs` module.