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You should probably return a value from

doAsyncStuff

and assign it to

output

.

export let output = doAsyncStuff();
async function doAsyncStuff(() => {
  ...
  return`${someResource.ingressHost}`;
});

ah, so an output can be a promise, and that promise's resolve value will be the value of the output?

yes. You can also wrap a promise into

pulumi.output

if you need to use it for inputs to other resources.