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-react16.2.1 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?

i'm trying to convert firebase ts declarations with ts2kt lib, and got tons of

@nativeGetter

in code which is deprecated and message is: "Use inline extension function with body using dynamic" which i don't fully understand. the code looks like:

@nativeGetter
    operator fun get(name: String): FirebaseServiceFactory?
    @nativeSetter
    operator fun set(name: String, value: FirebaseServiceFactory)