Hello I am porting part of our Android app to JS via the Multiplatform set up. Its pretty awesome but I am having one issue with the expect/actual set up in JS. I am trying to port over my Json Serialization layer. So I created an Expect Json class like:

expect class Json {
    fun getInt(id: String): Int

But with JS, the native Json class is only an interface so implementing it like:

actual class Json: kotlin.js.Json {
    actual fun getInt(id: String): Int {
        return this[id] as? Int ?: 0
    }

Does not work. Any suggestions?

Can anyone get JSON.parse to work with their actual/expect classes or is it impossible? It doesn’t seem like you can have a cross JVM-JS JSON.

Subclassing XMLHttpRequest?

class Request(): XMLHttpRequest() {}

This throws an error because the compiled code doesn’t call the XMLHttpRequest constructor

can i use kotlin/js without gradle?

im going to be using OnsenUI react components in my app, anyone know how to use a 3rd party component like that with the Kotlin react wrapper?

you can't use the dash

-

character

Now I receive error "Could not find org.jetbrains.kotlin-react:16.2.1-pre.19-kotlin-1.2.30:.". Are last semicolon and dot unwanted?

Okey, one more question. I am trying to convert javascript object to kotlin class. I.e.

data class Book(val bookId: Int)
val obj = js("{ bookId: 10 }")
val book = obj as Book

Last line fails with

ClassCastException

(of course). What is the correct way to do it?

I'm trying to use https://github.com/lightningtgc/MProgress.js in my KotlinJS project. I'm using

org.jetbrains.kotlin.frontend

and have "mprogress" as a

dependency

. I've set up this external class:

external class Mprogress(params: Json) {
    fun start()
    fun end()
    fun set(percent: Double)
    fun inc()
}

However, when I try to create a new Mprogress object, it says it can't locate Mprogress' JS definition. How can I make sure it's included?

@robstoll maybe as dynamic, then:

val body = document.querySelector("body").asDynamic()
    body.foo = Foo(42)
    println(body.foo)

Does anybody know how to access values of

.env

in Kotlin (used create-react-kotlin-app with yarn)?

I’ve tried to figure this out on my own to avoid being a bother but can someone give me just a short example of how to use the kotlin-css package to make a stylesheet? I cannot for the life of me figure this out for some reason. @Leonid Khachaturov

Is there functionality like

webpack.config.d

for

webpack-dev-server-run.js

, or a way to otherwise manually configure the server for the kotlin frontend gradle plugin?

Hey, I receive error

duplicate target file will be created for 'build/node_modules/kotlin-compiler/lib/kotlin-stdlib-js.jar!kotlin.js' and 'build/node_modules/kotlin-compiler/lib/kotlin-jslib.jar!kotlin.js'

(step

:runDceKotlinJs'

) when trying to build my project on Ubuntu. I can build it on Windows. Kotlin version is 1.2.30. Where can be a problem?

How to implement Stripe API in Javascript on Firebase cloud server?

Is there a way to split kotlin-js apps up into multiple bundles?

I am trying to add the "class" attribute to a third party component I imported into my kotlin-react project. How can I do that since "class" is a reserved word and attrs["class"] = "myclass" is not possible since RClass has 'attrs' defined as a function that takes a lambda

Anyone tried using the kotlin-css library for building stylesheets yet? https://github.com/JetBrains/kotlin-wrappers/tree/master/kotlin-css

the grandle build fine, but IDEA still mark as unresolved reference

@danfma is there a reason to use kodando over kotlin-wrappers or vice-versa?

Has anyone experience of using Kotlin code in JavaScript when building with webpack and npm? That is, I don't want to write JavaScript-code in Kotlin, I want to use my Kotlin-code in JavaScript

I've setup a project with npm and Vue.JS and when I try to import my code using

require("path/to/mykotlinlib-js")

then I get "These dependencies were not found: kotlin in path/to/mykotlinlib.js", and also such an error about klogging as I'm trying to use the KLogging library for Kotlin.

Do you know how can I get a JS object with the same proto as plain JS object from a data class (

Object.getPrototypeOf(input) === Object.prototype

) ?

When I use Ef.create() ,it return a

ef.create(str)

in Javascript. But I want to get a

new (ef.create(str))()

, how I can do for this?

I wrote an article about uses Kotlin to develop your Firebase Cloud Functions (NodeJS app based on ExpressJS). https://medium.com/@martial.maillot/firebase-with-kotlin-introduction-part-1-of-2-39541a3fa87b Thanks to the team for the help!

I see this bug still opened. https://youtrack.jetbrains.com/issue/KT-15957 What is the current status of incremental compilation in Kotlin/JS? Is it coming with all the IR work?

Maybe you could ‘steal’ some things they changed to clojurescript recently, all the non-project stuff is cashed.

I'm getting an unresolved reference to kotlinx despite everything seeming to be in order?