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When you say “return a generated output” what exactly do you mean?

i'm calling an API and it generates a token, i wanted to expose that as a property of the dynamic resource

but then i remembered i've had this before - and it needs a public readonly memberName: pulumi.Output&lt;string&gt;; on the resource class

and it gets filled out automatically, provided you pass that in as the input block to the provider constructor

Got it. If you have a repro of what you did that triggered that error originally - I’d love to see it. At the very least it should be a better error message. 

i think its actually related to a confusing type annotation on child_process.spawnSync - the return type has stdout: string on it, but in reality it's a Buffer

so i was returning that buffer to the pulumi.Output&lt;string&gt; and then getting a protobuf fail