How to make switch required?

option().switch(...).required() does not compile, neither does option().required().switch(...).

[ajalt]

There isn’t a required() extension for flag/switch options. You can write your own like this:

fun <T : Any> FlagOption<T?>.required(): FlagOption<T> {
    return copy(
            transformEnvvar = { transformEnvvar(it) ?: throw MissingOption(option) },
            transformAll = { transformAll(it) ?: throw MissingOption(option) },
            validator = validator,
    )
}

Since we already have a default() extension, I think it would make sense to add this as a built in extension.

[ajalt]

That’s the plan.