Hello, What is the alternative to @JsExport a function with a [Mutable]Map<String, String>? I...

# multiplatform

[Alfred Lopez]

Hello,

What is the alternative to @JsExport a function with a [Mutable]Map<String, String>? I'm getting a

Exported declaration uses non-exportable parameter type: Map<String, String>

error on functions that have Map as parameters.

Thanks

[Trevor Stone]

https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.js/json.html

[Alfred Lopez]

Thanks! The only problem with Pair is that it doesn't store a set of data. Just one Pair. I would have to create my own Map using a combination of Array and Pair somehow.

[Alfred Lopez]

Actually, I see your point with using json. Let me look into this.

[ankushg]

You can also use the Record type from here : https://github.com/JetBrains/kotlin-wrappers/blob/master/kotlin-extensions/src/main/kotlin/kotlinext/js/Record.kt

Corresponds with: https://www.typescriptlang.org/docs/handbook/utility-types.html#recordkeys-type

[Alfred Lopez]

@ankushg Tried using the kotlin-wrappers, but it doesn't seem like Gradle is loading them. In fact, it seems to break my code. Can I use this in a multiplatform project? Do I put the dependencies in the common code or in the JS target?

Thanks

[ankushg]

Ah I've copied the definition of Record into my jsMain sourceset, and then (in my jsMain sourceset) wrap my Map-using method in one that converts to/from Record

[Alfred Lopez]

I see. So this is really for JavaScript to Kotlin interoperability. I'm actually building a MPP that targets the JVM and JS. So I need it in my common code.

[ankushg]

Yeah it's definitely painful — we have a ton of common code using maps and data classes for JVM and Native, and then need to wrap everything for JS :-/

[Alfred Lopez]

@ankushg question: do you know why when I use @file:JsExport on a class that extends another, the overridden methods don't get exported?