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Have you looked at CUE? (https://cuelang.org/docs/concept/the-logic-of-cue/)

CUE is also pragmatic in that it has integrations with yaml, json, jsonschema, openapi, protobuf

I've tried out Pkl which is similar in spirit, and I think it's a real solution for k8s manifests. The only thing holding it back is industry adoption imo. It's leagues better than Helm, and mostly better than Kustomize.

See also: KCL, which is very similar and might _actually_ be "the winner". Time will tell.

I don't expect a winner personally, rather that there will be dozens of alternatives always. Like build systems, deployments are quite bespoke to organizations and legacy has a way of sticking around for a long time

Having used CUE, mainly outside of Kubernetes, I cannot see myself switching to KCL. I really like having a configuration language that isn't so tied to a specific system and which I can use with the Go SDK

So whats your take on https://github.com/stripe/skycfg do you also have experience with it?

No, I went with CUE instead of Starlark

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