We're writing classes in Kotlin which are (1) reliant on enums, and (2) heavily nested. We want to ...

# javascript

[ankushg]

We're writing classes in Kotlin which are (1) reliant on enums, and (2) heavily nested.

We want to call methods that use/return these classes from our Typescript codebase, where enums are defined as a named set of constants: https://www.typescriptlang.org/docs/handbook/enums.html

We find ourselves using kotlinx.serialization almost exclusively to map from Kotlin Enum Classes to `Int`/`String`s for JS, because our deeply nested classes make it difficult to handwrite methods that accept primitives and map them to Kotlin enum classes.

• Is there any way to have Kotlin expose enum class es as `String`/`Int` values in JS, instead of generated Kotlin classes?
• Will 1.4 be able to expose Kotlin enums as legit Typescript enum constants?
• Is this something that we need `inline enum class`es to solve?

[turansky]

Custom serializer can solve problem TS Int <-> Kotlin enum

[turansky]

You can create special interface for enums to simplify converting:

interface JsEnum {
    val data:Int
}

enum class MyEnum(
    override data:Int
)JsEnum {
    UP(1),
    DOWN(2),
    // ...
}

[ankushg]

In JS/TS MyEnum.UP is still exposed as an object containing { data: 1 } and not a raw integer literal 1, right?

I already have custom kotlinx.serialization Serializers defined to go from int/string to enums, but it feels like a nontrivial amount of overhead…

[turansky]

Convertation Int -> Enum -> Int - responsibility of custom serializer