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What about something like https://github.com/dhall-lang/dhall-kubernetes ?

Interesting, this is similar to jsonnet. Does it support deep merging?

For example, in our case we do `default_deployment.libsonnet` to which we add arbitrary overrides like `default_deployment + dev` or `default_dep + us_central1_overrides` depending on the cluster. And in these case we don't need to pre-specify what can be overriden in the `default_deployment` which makes it really powerful (also can come bite you in the arse though).

I'm not sure how it would work with this, since I've never used it, but Dhall does have some kind of recursive merge operator that might work https://docs.dhall-lang.org/references/Built-in-types.html#i....

You might have to overload it somehow to make it work the way you're describing though.

As far as I understand Dhall, you have the choice between writing specific types in order to have a safe, actually decent to use interface (which is kind of the point of Dhall), or you can just use a key-value map in order to cut corners while writing.

But honestly, if you're going for the latter, might as well just use Kustomize and accept the chaos.

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