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You probably need an "apply", nice blog post about here https://leebriggs.co.uk/blog/2021/05/09/pulumi-apply or the official docs about outputs at https://www.pulumi.com/docs/concepts/inputs-outputs/

Thanks @echoing-dinner-19531 for response but i tried with apply which does not work, Here is the code

const iapProtectedEmailId = iamStack.getOutput("iapProtectedAdditionalEmail")
const emailIDD = iapProtectedEmailId.apply(x => `${iapProtectedEmailId}`);
additionalIapMembers.push(emailIDD) ;

additionalIapMembers is an string array and it does not allow emailIDD

const emailIDD = iapProtectedEmailId.apply(x => `${iapProtectedEmailId}`);

That looks wrong. "apply" must always return an output, you can't use an apply call to remove the outputness of a value. If iamStack is a stack reference you can probably use getOutputDetails instead here to make it easier to work with.

Also using Stack References. I just created await-able wrappers for them. e.g.

export const vpc = async (): Promise<aws.ec2.Vpc> =>
  new Promise(resolve => account.getOutput('vpc').apply(v => resolve(v)))

Then used like:

{
   vpcId: (await vpc()).id,
}