Good day, all. I'm writing an SDK in Kotlin/JS for...

# arrow

[Andromadus Naruto]

Good day, all. I'm writing an SDK in Kotlin/JS for an API (Ktor) with lots of common code. Basically a Kotlin Multiplatform project. The SDK is to be consumed by a Typescript project soon.

I've run into two issues:
1. I can't seem to use the Either type to represent error/success state in my SDK as I keep getting a warning: Exported declaration uses non-exportable return type: Either<DomainError, TodoDto>. I understand that the Either type isn't annotated with @JsExport that's why I get the warning. Is there a way to workaround this?
2. How would you recommend I use Arrow's suspending functions in a situation where suspending functions can't be used in a context with the @JsExport?
Thanks in advance... 🙏🏾

[CLOVIS]

Sorry, I don't know about point 1.

For point 2, the simplest way is probably to declare helper methods/objects in jsMain that return promises. For example, if your common code looks like this:

class Foo(
    val a: Int,
) {
    suspend fun foo(): Bar
}

you can create a wrapper for use by JS libraries:

@JsName("Foo")
class FooJs internal constructor(
    private val wrapper: Foo,
) {

    constructor(a: Int) : this(Foo(a))

    fun foo() = promise { wrapper.foo() }
}

[Andromadus Naruto]

Thank you very much, @CLOVIS. I'll try it out soon. 👍🏾