Js interop question. How do I get a reference to a...

# javascript

[spand]

Js interop question. How do I get a reference to a kotlin class constructor that javascript can call new on ?

class KotlinClass extends ExternalClass {
    constructor(p1 : Context) : super(p1) {
    }
}

When I pass KotlinClass::class.js it will pass the KotlinClass in javascript land.. but the super call is placed in the function KotlinClass_init() which seems to ever only be called from Kotlin.
I tried getting a reference to KotlinClass_init but doing ::KotlinClass in kotlin land doesnt work either. I think its because it is wrapped in a function leading to a loss of the this value. Ultimately I cannot see how javascript can ever new a Kotlin class that needs to pass parameters to its super constructor.

It seems to me that it is a compiler flaw that the kotlin constructor body is not placed in the native javascript constructor instead of this init function.

[Svyatoslav Kuzmich [JB]]

Kotlin can have multiple secondary constructors while JS supports only a single one. Thus all secondary constructors are implemented as separate functions.

However KotlinClass::class.js should work when using primary Kotlin constructor, instead of a secondary one:

class KotlinClass(p1: Context) : ExternalClass(p1) {
}

In these cases, when possible, I prefer wrapping constructor calls with a regular function, so you can call it without new from JS:

fun createKotlinClass(p1: Context) = KotlinClass(p1)

[spand]

Thank you. That was my first attempt but I must have gotten confused since that turned out not to be my issue.

[spand]

Turns out we needed to emulate inheritance of statics. Yet another funky part of js interop