What's the corresponding of a TS class with static...

# javascript

[Edoardo Luppi]

What's the corresponding of a TS class with static methods in Kotlin?
Is KotlinJS able to generate those?

[Chris Lee]

Seems like you are after Companion Objects:

class Foo {
	companion object {
		fun something() : Boolean {
			return true
		}
	}
}

[Edoardo Luppi]

@Chris Lee unfortunately this is what gets generated for TS

export declare class Foo {
    constructor();
    static get Companion(): {
        something(): boolean;
    };
}

[Chris Lee]

Why is that unfortunate? It’s semantically equivalent. You can name the companion object as you like.

[Edoardo Luppi]

I would prefer something like

export declare class Foo {
    constructor();
    static something(): boolean
}

Which is much more usable from the TS side.

[Edoardo Luppi]

The JVM has JvmStatic for this reason, for example.

[Chris Lee]

You can’t have both - the Kotlin-generated JS code is designed to work for Kotlin and be interoperable with TS (via Companion object). If you had raw JS it wouldn’t be interoperable with Kotlin.
@JvmStatic maintains the Kotlin interop and eases the Java interop, in ways that are specific to the JVM.

[Jeff Lockhart]

This would be similar to something like this for Kotlin/Native. Maybe @JsStatic for Kotlin/JS.