Pkl is a new programming language for writing configuration files. The language outputs to JSON, YAML, XML, and other common formats used for configuration files. It builds on the typical experience (doing it by hand) through the inclusion of Intellisense, loops and classes, Type Safety, and the ability to impose constraints on values… and the constraints syntax and capabilities both look like they rule.
Example Pkl code:
email: String = "example@example.com"
port: Int(this > 1000) = 90Here port would throw an error for not fitting to its constraint.