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You’ll have to resolve the input with an Output/apply since the value might not be known otherwise. Something like:

const foo: pulumi.Input<string> = "possibly-unknown-value"
pulumi.output(foo).apply(foo => {
  if (foo === "bar") {
     console.log("it's a bar")
  }
})

and I’m allowed to create new resources inside the `if (foo === …`block? Like instantiate my kubernetes.Chart resource?

It’s possible to create resource inside an

apply

, but can cause inaccurate previews, and isn’t recommended if you can avoid it. https://www.pulumi.com/docs/intro/concepts/programming-model/#apply

my usecase is: if the cluster that I’m configuring is using Ambassador as gateway (ingress), I need to remove the Ingress created by a Helm chart and add a Mapping (Ambassador CRD)