Is there any way to write a "static" (i.e. companion object) extension fun or val for a Java class? ...

# getting-started

[Jonathan Lennox]

Is there any way to write a "static" (i.e. companion object) extension fun or val for a Java class? I want to write something like

import java.time.Duration

private val durationMax: Duration = Duration.ofSeconds(Long.MAX_VALUE)
val Duration.Companion.MAX: Duration
    get() = durationMax

but there's no java.time.Duration.Companion of course. Is there a decent idiomatic equivalent way to do this?

[Jonathan Lennox]

I could of course just make the val durationMax public but it doesn't feel as idiomatic, especially since ktlint won't let me capitalize it.

[Adam S]

No, not yet. But watch this space... https://youtrack.jetbrains.com/issue/KT-11968/Research-and-prototype-namespace-based-solution-for-statics-and-static-extensions

[CLOVIS]

It's been moved to https://github.com/Kotlin/KEEP/issues/348