Hi. Isn't is possible to use `JsReadonlyMap` on th...

# javascript

[Felix]

Hi. Isn't is possible to use JsReadonlyMap on the public interface of a JsExport class? IDEA show the "Exported declaration uses non-exportable ...". I would assume that this type was created exactly for this interoperability purpose.

[turansky]

It was created for interop.
At the same moment it what already exists in browser typings.
Problems:
1. No possiblity to avoid duplication with existed ReadonlyMap
2. Exported ReadonlyMap from Kotlin/JS will be broken, because of export limitations

[Felix]

Thanks. Not sure I understood the response.
• My goal is exactly interop, namely consume KT from JS/TS.
• How hours I expose a readonly map for JS/TS consumers

[Edoardo Luppi]

You mean like this?

import kotlin.js.collections.JsReadonlyMap

@OptIn(ExperimentalJsCollectionsApi::class)
interface I {
    val map: JsReadonlyMap<String, String>
}

@JsExport
@OptIn(ExperimentalJsExport::class, ExperimentalJsCollectionsApi::class)
class C(override val map: JsReadonlyMap<String, String>) : I

[Felix]

Yes, similar to that.

@JsExport
class SomeClass (...){
   val someProp: JsReadonlyMap<String, SomeExportableClass>
}

[Edoardo Luppi]

I don't see any warning here