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# general
s
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l
If you run this before the provider is resolved, it will be 
undefined
forever, won't it? It's resolved immediately.
You need to use 
this.clusterOidcProviderId = cluster.core.oidcProvider.id
m
Thanks for the reply @little-cartoon-10569 - but since oidcProvider is an optional field for 
new eks.Cluster({})
, Typescript is throwing an error. So I tried 
const clusterOidcProvider = cluster.core.oidcProvider as any
and then 
this.eksHash = clusterOidcProvider.id.apply((oidcProviderId: any) => oidcProviderId.split('/').slice(-1)[0])
but it’s still undefined.
Also, even if 
oidcProvider
is optional, wouldn’t the apply run as a callback when the 
oidcProvider
value is eventually resolved? If that’s the case, 
this.eksHash
should resolve to the right value, no?
l
Then you're going to have to postpone getting the value until you know it is there. There is a problem in that you're using the same code to handle two different cases: one where the provider will never be there, and one where it will be there but isn't there yet.
The apply runs when the Output is resolved. But the code you have can run even if the variable doesn't have an Output, in which case, the id will be immediately undefined.
You could try 
if (cluster.core.oidcProvider != undefined) { this.eksHash = this.clusterOidcProviderId?.apply(oidcProviderId => oidcProviderId.split('/').slice(-1)[0]); }
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