How to read an environment variable in Kotlin?

I'd like to get a certain value from an environment variable in my Kotlin app, but I can't find anything about reading environment variables in the core libraries documentation.

I'd expect it to be under kotlin.system but there's really not that much there.

It is really easy to get a environment value if it exists or a default value by using the elvis operator in kotlin:

var envVar: String = System.getenv("varname") ?: "default_value"

You could always go down this approach:

val envVar : String? = System.getenv("varname")

Though, to be fair, this doesn't feel particularly idiomatic, as you're leveraging Java's System class, not Kotlin's.