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Looking at this blog post (<https://www.pulumi.com/blog/get-up-and-running-with-azure-synapse-and-pulumi/>) and the spec of synapse.Workspace - it's similar to the  output spec of compute.DiskEncryptionSet and a lot of others in that the `identity` field is not listed in the output (as it is an input), but is still accessible (because all inputs are), and has the same *IdentityResponse type - meaning that it should expose principalId and tenantId.  The example uses the `workspace.identity.principalId`though as far as I can tell - typescript will go bananas at the thought of using it (as it does with me). Is this an issue with type declarations or something?

```Property 'principalId' does not exist on type 'Output&lt;EncryptionSetIdentityResponse | undefined&gt;'.```


Considering it's sunday and all, and I don't expect Mikhail to be everywhere all at once - I'll open a github issue on this one as that error does seem to indicate a bug for me :wink:

Once again Mikhail is sortof debugging this even in his absence - looking through existing issues, there's one related to RoleAssignmentName (<https://github.com/pulumi/pulumi-azure-native/issues/625>) in which he links to a c# example where he uses random..

in that code - right below - he's using chained `.apply`'s to get the principalId out of the identity <https://github.com/pulumi/examples/blob/2e9e18b36a9720dd0e691f2bfe883bbfd46bd512/azure-cs-synapse/MyStack.cs#L79>

Yes, you need `apply`. Responded in the issue.

so.. taking that c# and putting it into ts makes that line look like this for me:
`principalId: diskEncryption.identity.apply(identity =&gt; identity?.principalId).apply(principalId =&gt; principalId ?? "&lt;preview&gt;")`

Thanks Mikhail - closing issue and finally able to deal with real problems :wink: