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# typescript

sparse-intern-71089

04/02/2021, 10:18 AM

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little-cartoon-10569

04/03/2021, 6:09 AM

I don't think you can do this by casting or wrapping: the type of a

pulumi.output(x as Promise<X>)

is going to be an

Output<Promise<X>

. Rather, everywhere that you might use an Output or Promise actually takes an Input, which is a union type including both the Output and the Promise. So you can just ignore the requirement for an Output, and use the Promise directly.

little-cartoon-10569

04/03/2021, 6:11 AM

So you could rewrite your example code as

Copy code

const output = new Promise<Map<string, string>>((resolve, reject) => new Map<string, string>());

And use that output variable anywhere that needs an Input.

gifted-island-55702

04/06/2021, 7:24 AM

Thank you @little-cartoon-10569. The issue is I want to expose that value as an output property of my ComponentResource class. My understanding is that I should use pulumi.Output type in such cases.

little-cartoon-10569

04/06/2021, 8:44 PM

You can use any type. Things that you can pass an Output<x> to (almost) always take an Input<x>, which is a union type defined as

x | Promise<x> | Output<x>

. You can export strings, Promises of lists, Outputs of numbers.. whatever you like.

little-cartoon-10569

04/06/2021, 8:47 PM

And "outputs" of ComponentResources are just properties, there is no magic to them. The only "output" variables are those exported from Pulumi projects / stacks. Any public properties of ComponentResources, of any time, can be exported and Pulumi will handle it. (With the gotcha that there is no marshalling / unmarshalling, so if you're exporting non-primitives, you're going to have to marshal / unmarshall them yourself).

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