Is it possible to configure separate browser and nodejs sourceSets within a single js target? Thinking about a multiplatform context where they want to share some code but not all.

How do I 'copy' my resources over to the webpack directory? Under 'build/js/packages/<project>'? I'm trying to use the HtmlWebpackPlugin with a template index.ejs but I don't know how I can pass the index.ejs from my resources folder into that project dir? It just places it under 'processedResources' which I do not want.

I am experimenting with Kotlin 1.4-M1, and live reload with the IR compiler. On a "Hello, World" project reload takes ~1 second on my laptop, which is really nice. However, if I add some code (~5K lines), the reload takes ~10 to 20 seconds, even if I change only one line in the main class (i.e. code with no relevant dependencies). Is this expected, or should I get faster reload times? For reference, the generated JavaScript file is approximately 1Mb in size. I am asking, because I am trying to decide whether I should make the frontend application in React/TypeScript and leave some critical code in Kotlin, or whether I can do all frontend development in Kotlin (which would, of course, be preferable).

With gradle kts dsl, there are generated sources that are very useful. so that instead of doing

"implementation"("dependency")

we can do

implementation("dependency")

. Does anyone (maybe from JB) knows if there are plans to, similarly, generate type safe mappings from npm dependencies on Kt JS? It would make it significantly easier to interop with js without having to create all the mappings manually (or wait for someone else to make a wrapper 🙃)

Hello, did someone manage to use the generated

d.ts

file in a react app for example? Basically, what I don’t understand is that it declares the root project as a

namespace

instead of a

module

so when I try to import use the

d.ts

and import my module I get the error

lib.d.ts is not a module

.

Is there a way to have the DCE task run but without minifying? I want to get the least needed readable code possible!

Can someone point me to kotlin browser side websockets? Google searching turns up lots of server side code and tutorials which use regular javascript on the browser side. I am finding it extremely challenging to find information about kotlin js, in fact I don't even know if that is a thing. I am using the html DSL in a create-kotlin-react project. Maybe I came to this party too late. Need a break through.

Using React, is it possible to have a function in an RState interface that modifies additional state based on logic? I'm converting a JS example to Kotlin and they wrap all the state in a custom hook with at least 1 inner function that conditionally set some state values based on logic. I tried doing that in Kotlin and it didn't seem to work. Not a big deal but seems like a cleaner way to separate code by having state logic directly in the interface that defines it. An example below. setState { someFunction(newValue) // member of RState interface that sets 1 or more values }

In a gradle multi-module setup with the kotlin js plugin executing tests from Idea does not work. Running gradle tasks from the ui does not work either. Both work fine on the command line. Both print the following error when run from the IDE

Build file '.../hydrants/hydrants-cloud-functions/build.gradle.kts' line: 1
* What went wrong:
Plugin [id: 'org.jetbrains.kotlin.js'] was not found in any of the following sources:
- Gradle Core Plugins (plugin is not in 'org.gradle' namespace)
- Plugin Repositories (plugin dependency must include a version number for this source)

line 1 of is

_kotlin_(*“js”*)

inside the plugins block. It is almost as if Idea tried to parse the gradle file as if it was a standalone project

Hi everyone, I'm having some issues building a Kotlin/JS React app in production mode (it works when running it locally in dev mode), if anyone can give me a hand it'd be greatly appreciated as I'm quite new with JS. I wrote a post in the Kotlin forum (https://discuss.kotlinlang.org/t/kotlin-js-project-doesnt-build-properly-for-production/17022) as it's a lot of text to put here.

hey guys, i posted this in #multiplatform yesterday, and i’m guessing that i’m running into issues here because js doesn’t support non-local returns? does anyone know how I can write this in a manner that will work on js? function:

inline fun <reified T> withResult(
    method: Result<T>,
    onFailure: (errors: List<Throwable>) -> Unit
): T {
        @Suppress("IMPLICIT_CAST_TO_ANY")
        val methodResult = when (method) {
            is Result.Success -> { method.t }
            is Result.Failure -> { onFailure.invoke(method.errors) }
        }
        return methodResult as T
}

usage:

val r = withResult(method) { return Result.Failure(it) }

i can get this function to work on jvm, however it does not work on js. it results in a

ClassCastException

the transpiled js appears to show that instead of invoking

onFailure

it is only assigned to

methodResult

. also, this is a custom sealed class

Result

not

kotlin.Result

I have been working on an app with one JS client and the server. I have split that into two separate clients, each as their own JS application, using the js plugin. However, with both in the same gradle root project (each are a subproject), I am getting “NPM Dependencies already resolved and installed” when building. If I build them separately, they each build fine, but when run as part of a larger build process, I get that error. Any insights?

Is making a “node exec” task generally available part of the js plugin plan (for running things installed by an npm dependency)? I have a few node programs I need to run, but to do that in gradle right now I’m juggling both the kotlin auto-installed node and the “com.github.node-gradle.node” plugin… which seems silly and causes multiple node installs.

Hi, I have a problem with webpack build within a multiplatform project. The frontend build fails with the following error:

Execution failed for task ':jsBrowserProductionWebpack'.
>                 Process 'webpack' returns 2

I've narrowed the problem down to the usage of

io.ktor.client.HttpClient

class. This error appears if I instantiate it or obtain its reflection descriptor in any part of the js source set and goes away if I remove all references of this class from the source set. My Kotlin multiplatform plugin version is

1.3.71

and Ktor version is

1.3.2

. I have dependencies on both

io.ktor:ktor-client-core

and

io.ktor:ktor-client-js

in my jsMain source set. Any help is appreciated - maybe anyone has ideas on why this is happening or at least how to gain more insight into what is happening during the webpack build.

Is anybody else having big memory usage spikes when running the browserTest task?

guys - i convinved my company to write a big piece of their app in kotlin/js and we are going to release soon - everything is working fine, but I am scared - did I make a big mistake :/

For someone that’s only using the community edition of Intellij for a personal project, what’s the best way to write a Kotlin/JS project that can utilize a nice REPL style? My first thought was to try and run the code via node.js during development/debugging, but that doesn’t seem like it’s an option? My next thought was to just build it as a multiplatform jvm/js project, and just run the jvm version during development, and deploy the js at the end? Is there a better way, given I don’t actually want to target the jvm? ^^

Is there any way to force a specific version of npm dependency globally? If I specify the version explicitly in gradle it's being used inside a "local"

node_modules

, but I need to force this in "project" `node_modules' (

built/js/node_modules

).

Hello, World! I'm having trouble with

is

returning false when it should return true 😛 I'm using a

sealed class

for a state, which has a few `object`s and `data class`es as subclasses, and a

when

like so:

when (state) {
    is Foo -> doSomethingFoo()
    is Bar -> doSomethingBar()
}

etc. Any suggestions?

Here’s a codesample anyway: https://github.com/yousuf-haque/kotlin-js-subdirectory-example

Hi everyone, I was wondering if there is a way to create different build variants in Gradle for a Kotlin/JS project? I come from an Android background so I'm looking for something similar to "product flavors" where I can have a different configuration for a development and a production build (e.g., using different API base URLs). I know that we can use development and production runs with

browserDevelopmentRun

and

browserProductionRun

but that feels like a "debug" and "release" thing where the former doesn't do any optimisations and the latter does.

Hi again, is there an easy way to convert Kotlin data classes (or normal classes) to JS objects? I have tried the

Any.asJsObject()

functions but that doesn't seem to do the trick. My use case is that I'm trying to use the Firestore JS library to save some data but it only receives JS objects as input when trying to save data and I'm using normal Kotlin classes to handle this same data in the we app logic.

Is there anything special about enum support in kotlin.js? I've been having some issues where enums seem to "devolve" into strings, which leads to errors when accessing their properties or using when statements on them

HI everyone, I'm preparing an a demo application for the purpose giving a talk, then i'm getting issues saying kotlin-styled is not being loaded, full details to the issue are mentioned in the below link, Kotlin-Styled not loading in the app, could you please help me to solve this. Thank you

Is there a way to change the name of the js file/lib that Kotlin Multiplatform build creates?

Hello. I went over the tuturial available at https://play.kotlinlang.org/hands-on/Building%20Web%20Applications%20with%20React%20and%20Kotlin%20JS/01_Introduction and after reading it my first exercise was to use one of the components available in the react bootstrap lib (https://react-bootstrap.github.io/getting-started/introduction). I created a

.kt

file for the

Alert

component and everything works fine exept importing the CSS resources. For now I dealt with this by importing the CSS file directly in html but I am wondering what would be the proper way of saying the following:

{/* The following line can be included in your src/index.js or App.js file*/}

import 'bootstrap/dist/css/bootstrap.min.css';

hello guys, is there any Static Content Generator built in kotlin-js ?

Hello People, I am working on a multiplatform project (kotlin version 1.3.61) and I am unable to access the indexedDb. Is indexedDb natively supported? If anyone has any insight on this and can share I would be very grateful 🙏

Hi! Is there a reason why properties on classes exported to JS are not enumerable? I noticed in 1.4-M1, if I have:

@JsExport
class UIComponent {
    val tagName: String = "h1"
}

It creates the following JS:

function UIComponent() {
  this._tagName = 'h1';
}
UIComponent.prototype._get_tagName_ = function () {
  return this._tagName;
};
Object.defineProperty(UIComponent.prototype, 'tagName', {
  get: UIComponent.prototype._get_tagName_
});

Consuming the JS with:

const h1 = new UIComponent(); Object.keys(h1);

only gives me the underscore prepended property

["_tagName"]

and

for (let p in h1)

will enumerate through the

_tagName

and

_get_tagName_

properties but skip over the property I want,

tagName

. I was expecting the opposite, where

_tagName

is not enumerable and

tagName

is enumerable. The reason is lots of JS libs rely on

hasOwnProperty()

and being able to enumerate through properties on an object considered its own. My specific use case is

Ember.Component.extend(new UIComponent())

doesn’t work because it cannot enumerate and find the properties I have defined. I think at the very least,

enumerable: true

should be added to

defineProperty()

or even better, the public properties get set in the constructor and the behind the scenes ones use

defineProperty()

and keep the default

enumerable: false

. But maybe there is a reason they are the way they are. Thanks!