pulumi-community #general

elegant-dress-88912

12/12/2019, 5:04 AM

Hello! What is the best practice to create conditional resources and outputs? I need to create service account and export its private key if stack has option like

createServiceAccount: true

elegant-dress-88912

12/12/2019, 5:10 AM

basic approach with

Copy code

// somewhere in index.ts
if (config.createServiceAccount) {
  const serviceAccount = new ...
  const serviceAccountKey = new ...
  export const serviceAccountPrivateKey = serviceAccountKey.PrivateKey
}

won't work, because 1. later I would need to access object props of, say, serviceAccount, but this variable scope is limited by

if

block 2. `export`'s seems to be not allowed in nested blocks in typescript

elegant-dress-88912

12/12/2019, 5:11 AM

for the 1st issue, I use declaration

let serviceAccount: type

before

if

block, but not sure what to do with the 2nd

ambitious-ram-5811

12/12/2019, 5:13 AM

Something like this should work:

Copy code

let serviceAccountPrivateKey: TypeOfThePrivateKeyType;

if (config.createServiceAccount) { ... }

export serviceAccountPrivateKey;

elegant-dress-88912

12/12/2019, 5:18 AM

@ambitious-ram-5811 thanks, I was close 🙂

elegant-dress-88912

12/12/2019, 5:22 AM

@ambitious-ram-5811 unfortunately, IDE complains about

export

after

if

saying 'variable is used before assignment'

elegant-dress-88912

12/12/2019, 5:22 AM

I have

let serviceAccountPrivateKey: pulumi.Output<string>

before

if

elegant-dress-88912

12/12/2019, 5:24 AM

I guess I need some default assignment first (empty output)

bored-jackal-93148

12/12/2019, 5:24 AM

declare

let serviceAccountPrivateKey: pulumi.Output<string | undefined>

ambitious-ram-5811

12/12/2019, 5:24 AM

let serviceAccountPrivateKey = default(ThatType)

bored-jackal-93148

12/12/2019, 5:25 AM

let serviceAccountPrivateKey: pulumi.Output<string> | undefined depending on where in the onion you are

ambitious-ram-5811

12/12/2019, 5:25 AM

No, you actually have to set it

ambitious-ram-5811

12/12/2019, 5:25 AM

It's not a type issue

bored-jackal-93148

12/12/2019, 5:26 AM

if it has to be set then the above code wont work … andrew says is’t a conditional resource

bored-jackal-93148

12/12/2019, 5:27 AM

if create …. ggive me the created … otherwise ???

bored-jackal-93148

12/12/2019, 5:27 AM

undefined is as valid as default(foo)

bored-jackal-93148

12/12/2019, 5:28 AM

you shouldn’t need assignment if you don’t need a value

elegant-dress-88912

12/12/2019, 5:28 AM

@ambitious-ram-5811 not clear how do I create default instance of type pulumi.Output<string>

elegant-dress-88912

12/12/2019, 5:29 AM

default(pulumi.Output<string>)

looks invalid expr

ambitious-ram-5811

12/12/2019, 5:29 AM

But when you say

let foo: [anything you type here]

, it doesn't actually assign it

elegant-dress-88912

12/12/2019, 5:29 AM

yep, it's declaration

elegant-dress-88912

12/12/2019, 5:30 AM

export requires assignment

bored-jackal-93148

12/12/2019, 5:30 AM

right … hence

| undefined

bored-jackal-93148

12/12/2019, 5:30 AM

no it doesn’t

bored-jackal-93148

12/12/2019, 5:30 AM

export const foo = undefined

bored-jackal-93148

12/12/2019, 5:30 AM

let x: string | undefined

elegant-dress-88912

12/12/2019, 5:30 AM

here you have assignment

bored-jackal-93148

12/12/2019, 5:30 AM

export x

will work

ambitious-ram-5811

12/12/2019, 5:30 AM

I could've sworn

default(Type)

was a thing but oh well - just write

let serviceAccountPrivateKey: pulumi.Output<string>? = undefined

bored-jackal-93148

12/12/2019, 5:31 AM

undeinfed is imlicitly assigned