Just declare extension function for that:

fun Any.hasOwnProperty(property: String): Boolean {
    return asDynamic().hasOwnProperty(property) == true
}

Or even

infix fun String.`in`(obj: Any): Boolean {
    return obj.asDynamic().hasOwnProperty(this) == true
}
// "ontouchstart" `in` window

but I like first option more

Unfortunately`js("p in this")` translates to

p in this

, not to

p in $receiver

. Thus the temporary

obj

variable.

I wish I could make the chrome console execute kotlin/js

Are there any plans to support Kotlin/JS expression execution in IDEA during js debugging? Same way as you use Kotlin during JVM debugging

I have a problem to run my tests with method names with spaces inside backticks. I get the following error from gradle:

e: $PATH: Name contains illegal chars that can't appear in JavaScript identifier
:js:compileTestKotlin2Js FAILED

From the style guide: https://kotlinlang.org/docs/reference/coding-conventions.html#names-for-test-methods

In tests (and only in tests), it's acceptable to use method names with spaces enclosed in backticks. (Note that such method names are currently not supported by the Android runtime.) Underscores in method names are also allowed in test code.

It only mentions that this is not working in Android so I assume it should work in JS. Am I doing something wrong or are they not supported at the moment? Using Kotlin 1.2.20

I have a Gradle-based JavaScript project I started in IntelliJ. It “works” in the sense that I can type

./gradle build

and it builds but in IntelliJ itself, when I’m in the Kotlin file, it says, in a greenish bar, “Kotlin not configured” and I can’t figure out what isn’t configured.

alrighty. It appears the other computer was using 1.2.10. After upgrading to 1.2.20; it now appears to be working…very strange indeed.

I found a community supported react-native bundler that uses webpack instead of facebooks custom bundler: https://github.com/callstack/haul . How do I get webpack to recognize and pull in my sourcemaps?

Not sure if reported already (bad code generation in 1.2.20, related to longs and ranges): https://github.com/korlibs/korio/blob/01d5ef0b03094620ae5fa8194c0b0848d04d7170/korio/common/src/main/kotlin/com/soywiz/korio/stream/SyncStream.kt#L169

MemorySyncStreamBase.prototype.read_4m9kcn$ = function (position, buffer, offset, len) {
    var tmp$;
    this.checkPosition_s8cxhz$(position);
    tmp$ = this.length;
    if (!((0).lessThanOrEqual(position) && position.lessThan(tmp$)))
      return 0;
    var end = min(Math_0, this.length, position.add(Kotlin.Long.fromInt(len)));
    var a = end.subtract(position).toInt();
    var actualLen = Math_0.max(a, 0);
    arraycopy(this.data.data, position.toInt(), buffer, offset, actualLen);
    return actualLen;
  };

0.lessThanOrEqual(position) <--

if (!((0).lessThanOrEqual(position) && position.lessThan(tmp$)))
return 0;

TypeError: 0.lessThanOrEqual is not a function
      at MemorySyncStreamBase.read_4m9kcn$ (korio-js.js:23710:15)
      at SliceSyncStreamBase.read_4m9kcn$ (korio-js.js:23581:30)
      at SyncStream.read_mj6st8$ (korio-js.js:23499:26)
      at readBytes_0 (korio-js.js:23847:36)
      at readString_0 (korio-js.js:23805:23)
      at ImageFormats.readImage_1ooaqm$$default (korim-js.js:6284:85)
      at ImageFormats.ImageFormat.readImage_1ooaqm$ (korim-js.js:5666:65)
      at ImageFormats.ImageFormat.read_zdd1ed$ (korim-js.js:5759:17)
      at Coroutine$ImageFormat$decodeInWorker$lambda.doResume (korim-js.js:5933:48)
      at korim-js.js:5911:25
      at KorioNative.executeInWorker_lnyleu$ (korio-js.js:38407:12)
      at executeInWorker (korio-js.js:6831:38)
      at ImageFormats.ImageFormat.decodeInWorker_nwlife$ (korim-js.js:5953:12)
      at Coroutine$readBitmapNoNative_0.doResume (korim-js.js:9536:48)
      at Coroutine$readBitmapNoNative_0.CoroutineImpl.doResumeWrapper_0 (kotlin.js:3630:27)

I wonder if kotlinx.serialization can be used to "serialize" it to a JS object and "deserialize" it from a JS object

is there a npm package for coroutines? I’m failing at the google

Hello, i’m new to kotlinx.html dsl library, but spend quite some time to understand how to write styling in production with create-react-kotlin-app I’ve a big scss/SASS files that i would like to port for the most Kotlin-inspired-way in terms of styling. I’ve heard that guys at Jetbrains are using it for the products, so what’s the best approach? Go back to css? Write jsx with js = {} I’ve big amount of classes in scss like : “.mainheader { &__content” so it doesn’t seem to work with classes as a Set<String>

What's the best way to make an external binding for a javascript function that takes a js object as a parameter?

Platform.select({
  ios: 'iOS',
  android: 'android',
});

I created an example of a working react-native application that uses Kotlin-js in case anyone else wanted kotlin w/ react-native: https://github.com/ScottPierce/kotlin-react-native

I'd rather not have to manually copy the script to my web-application every time i build it...

Idk if what I'm saying makes any sense, but I want the artifact to be built automatically when I change the source code. I'd rather not have to keep pressing "build" to make the artifact build every time I change the source code...

I see that function names like:

fun `This is my function name`() {}

are not allowed in JS. Are they going to be?

Hi! I try to create firebase HTTP trigger function with Kotlin. Firebase uses expressjs and I want to wrap this lib in Kotlin. Do you have any resources to explain how to do that ?

Is there any way to silence this compiler error?

Error (51, 5): Kotlin: Overriding `external` function with optional parameters

Hi! I'm trying to create a button that returns a user to the top of the webpage. document.documentElement?.scrollTop = 0.0 is the slightly edited code I'm using from https://www.w3schools.com/howto/howto_js_scroll_to_top.asp but I'm having trouble implementing in Kotlin. Have you got any ideas?

Is the Kotlin-frontend-plugin still in active development? Just submitted a pull request to fix it for 1.2.20, but it seems somewhat dormant.

For external modules, you don't need to declare acctual class See https://github.com/JetBrains/kotlin-wrappers/blob/master/examples/src/main/kotlin/example/Quill.kt#L13-L19 for sample usage

how do i add an

 

into an element? it keeps appearing as normal text😞

is there an up to date guide on how to get the dce plugin working with the frontend plugin?

Does Kotlin work well with Polymer or Angular Elements?

I try to develop firebase function with Kotlin in place of JS. In first place, I want to wrap expressjs (used by firebase to create endpoint). This is my code :

val expressLib = require("express")

class Express(val app: dynamic = expressLib()) {

    fun get(route: String, callback: (req: Request, res: Response) -> Unit) {
        app.get(route, { req, res ->
            val request = Request(req)
            val response = Response(res)
            callback(request, response)
        });
    }

}

class Response(private val responseJs: dynamic) {

    fun send(data: String): Response {
        return Response(responseJs.send(data))
    }

    fun json(data: Any): Response {
        return Response(responseJs.send(data))
    }

}

Is it a good approach ?

Is there a way to do code-coverage with Kotlin-js tests?

I think I have a bug on kotlin js:

fun main(args: Array<String>) {
	sayHello().talk()   
}

fun  sayHello() = HelloGenerator().apply {
    //talk = this::helloFunction // <- OK on jvz and js
    talk = ::helloFunction  // <- OK on jvm, KO on js
}

class HelloGenerator {
    var talk: () -> Unit = ::helloFunction
    fun helloFunction() { println("hello world") }
}

How do I split up my app into multiple separate modules? I tried moving my external definitions into libraries, and then compile them into my main module, and I'm getting errors running my code now. If I move it all back into 1 module, the error goes away.