Hi Is there a way to make data classes with default parameter values work properly in Swift? Example:

data class State @JvmOverloads constructor(
    val loading: Boolean = false,
    val data: ResponseBody? = null,
    val error: ApiError? = null
)

In Swift, it is resolved to

init(loading: Bool, data: ResponseBody?, error: ApiError?)

Neither with overloads or default values

Is this a bug or an expected limitation with inline classes vs. companion objects vs. Parcelable?

Anyone have managed to use

@JsonTypeInfo

from jackson in the common source of MPP project? I have tried to create expected annotation like this:

expect annotation class JsonTypeInfo(val use: Id, val property: String) {
    enum class Id {
        CLASS
    }
}

but

actual typealias JsonTypeInfo = com.fasterxml.jackson.annotation.JsonTypeInfo

doesn't compile (fails with the Id enum class)

I'm having a weird dependency issue when I try to include a multiplatform project in another multiplatform project's js source set (both projects use JS IR) via

implementation(project(...))

. The dependency block looks like:

val jsMain by getting {
    dependencies {
        implementation(project(":krosstalk-ktor-client"))
    }
}

but causes (in

kotlinNpmInstall

)

Error: Couldn't find package "krosstalk-krosstalk-ktor-client@1.0.3-ALPHA" required by "krosstalk-fullstack-sample@1.0.3-ALPHA" on the "npm" registry.
    at MessageError.ExtendableBuiltin (C:\Users\jimne\.gradle\yarn\yarn-v1.22.4\lib\cli.js:721:66)
    at new MessageError (C:\Users\jimne\.gradle\yarn\yarn-v1.22.4\lib\cli.js:750:123)
    at PackageRequest.<anonymous> (C:\Users\jimne\.gradle\yarn\yarn-v1.22.4\lib\cli.js:36539:17)
    at Generator.throw (<anonymous>)
    at step (C:\Users\jimne\.gradle\yarn\yarn-v1.22.4\lib\cli.js:310:30)
    at C:\Users\jimne\.gradle\yarn\yarn-v1.22.4\lib\cli.js:323:13
    at processTicksAndRejections (internal/process/task_queues.js:97:5)

This was working fine before I published the package, and it works fine when I include it without using

project

(i.e.

implementation("com.rnett.krosstalk:krosstalk-ktor-client:$krosstalk_version")

)

Hi there, Not found an answer - now I’m building a library for android/ios and plan to distribute it for iOS via cocoapods. I managed to made that locally as wrote in documentations. But what if I want to distribute it via remote repository. How to do that? And is it possible to do taht without have a link to target application podfile inside library. It looks weird to have it here, especially in case I have no knowledge about who will use ny project.

Just crossposting here great news from KMM plugin: now we have a compatibility with Xcode 12 (iOS 14) on Android Studios 4.1 and 4.2. The update is also compatible with Xcode 11.3.1, as well as both Kotlin 1.4.10 and 1.4.20-M1. Looking forward to hear your feedback! 🙂

Hi there. Just created an empty Kotlin Multiplatform Mobile library project and there is no gradlew or gradlew.bat even though 'Use Gradle wrapper' option selected. Is it normal? Also, I can see that gradle->wrapper was created.

Has anyone built (or seen) a Kotlin Multiplatform library for compressing data? I need to compress and decompress strings on iOS and JVM. Both of those platforms seem to have their own GZIP implementations, but if someone has already created something like this, I'd be inclined to check it out before writing it myself.

Are there any secure storage solutions for KMP? Doesn’t look like https://github.com/netguru/Kissme is maintained anymore.

I'm new to Kotlin Multiplatform. Is there a good place to find multi-platform compatible libraries? Some wiki or community-curated list? I know about the official kotlinx projects, but I've had a hard time discovering libraries and tools available in the ecosystem outside of the official set.

Does anyone as already had an issue with sqldelight encode with adapter? I'm trying to serialize a simple object, it's working fine on android, but crashes on ios....

@Serializable
data class AccessModel(
    val isAccessible: Boolean = false,
    val conditions: List<ConditionModel>? = null
)

@Serializable
data class ConditionModel(
    val id: Int,
    val value: List<String>? = null,
    val min: Float? = null,
    val max: Float? = null
)

It's crashing here:

bindString(1, visibility?.let { database.FieldAdapter.accessModelAdapter.encode(it) })

fun accessModelToString(item: AccessModel): String = Json.encodeToString(AccessModel.serializer(), item)

val accessModelAdapter = object : ColumnAdapter<AccessModel, String> {
    override fun encode(value: AccessModel): String = SharedJSONConverter.accessModelToString(value)
}

Here the object that's crashing.

{"conditions":[{"id":321,"value":["40"]}]}

Hi! 👋 I'm currently trying to implement Ktor at my company, but I get a really weird error and I really don't know how to debug it. I was hoping someone here might have experienced the same or had any ideas 🙏 Full description on YouTrack

Hey folks, I am porting an android library using

ktor

&

kotlinx.serialization

to a multiplatform library, but I am not sure which version of the multiplatform dependencies I should use. The android consumer of that library uses Kotlin

1.3.72

and I can't change that to

1.4.x

, yet. My android library uses ktor

1.3.1

and kotlinx.serialization

0.20.0

, but if I apply those versions to the multiplatform dependencies, I am running into an Kotlin/Native error:

e: Could not find "/Users/X/.gradle/caches/modules-2/files-2.1/io.ktor/ktor-client-serialization-iosx64/1.3.1/df889ad1b8cc9fc91850d7d320b61e95597b1ce7/ktor-client-serialization.klib" in [/Users/X/Documents/repos/multiplatform-graph, /Users/X/.konan/klib, /Users/X/.konan/kotlin-native-macos-1.3.70/klib/common, /Users/X/.konan/kotlin-native-macos-1.3.70/klib/platform/ios_x64].

Thanks in advance!

I’ve got a “resources” abstraction in my KMP library that uses expect/actual declarations to do the actual work of “get the localized string” and “build a color value from HSL/RGB” etc. Works pretty well. I’m trying to add some unit tests for this code and running into the limitation of expect/actual (that you can’t swap it out for a dummy impl in tests). What do other people do for this sort of thing? Use an interface instead?

Hello everyone, I just have started exploring Kotlin multiplatform and created the Hello World! project. I can run the Android project on emulator but I don't see the option to run the iOS app. Even iOS simulator option is also not visible. I must have missed something. How to run the iOS app in Kotlin Multiplatform project? Can someone please help me to solve this query?

Anyone have any pointers for testing suspend functions in commonTest? I've tried depending on

kotlinx-coroutines-test

to help me with this, but unfortunately I ended up getting an error.

val commonMain by getting {
    dependencies {
        implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.9")
        implementation("io.ktor:ktor-client-core:1.4.0")
    }
}
val commonTest by getting {
    dependencies {
        implementation("org.jetbrains.kotlinx:kotlinx-coroutines-test:1.3.9")
        implementation(kotlin("test-common"))
        implementation(kotlin("test-annotations-common"))
    }
}

Error:

Caused by: org.gradle.internal.resolve.ModuleVersionResolveException: Could not resolve org.jetbrains.kotlinx:kotlinx-coroutines-test:1.3.9.
Required by:
    project :
Caused by: org.gradle.internal.component.NoMatchingConfigurationSelectionException: No matching variant of org.jetbrains.kotlinx:kotlinx-coroutines-test:1.3.9 was found. The consumer was configured to find a usage of 'kotlin-runtime' of a component, as well as attribute 'org.jetbrains.kotlin.platform.type' with value 'js', attribute 'org.jetbrains.kotlin.js.compiler' with value 'legacy' but:
  - Variant 'apiElements' capability org.jetbrains.kotlinx:kotlinx-coroutines-test:1.3.9:
      - Incompatible because this component declares an API of a component, as well as attribute 'org.jetbrains.kotlin.platform.type' with value 'jvm' and the consumer needed a usage of 'kotlin-runtime' of a component, as well as attribute 'org.jetbrains.kotlin.platform.type' with value 'js'
      - Other compatible attribute:
          - Doesn't say anything about org.jetbrains.kotlin.js.compiler (required 'legacy')
  - Variant 'runtimeElements' capability org.jetbrains.kotlinx:kotlinx-coroutines-test:1.3.9 declares a runtime of a component:
      - Incompatible because this component declares a component, as well as attribute 'org.jetbrains.kotlin.platform.type' with value 'jvm' and the consumer needed a component, as well as attribute 'org.jetbrains.kotlin.platform.type' with value 'js'
      - Other compatible attribute:
          - Doesn't say anything about org.jetbrains.kotlin.js.compiler (required 'legacy')

I've just published a first preview version of the gradle plugin I've been working for past couple days. It enables publishing to NPM repositories in a similar way

maven-publish

does for maven repsitories. It also setups your publications automatically from your JS compilations, yet allows for custom publications too. Give it a goo and let me know what you think! https://gitlab.com/lt.petuska/kpm-publish/-/releases/v0.0.2 Slack Conversation

@kpgalligan, I noticed the comment in the KaMPKit project saying

// Revert to just ios() when gradle plugin can properly resolve it

for adding the ios source set. Applying your “workaround” fixed my unresolved reference issues in iosMain. Do you know when the plugin will be fixed, or a ticket for the plugin I can follow the progress?

Hi, I’m trying to call a kotlin code from ios non main thread and I’m getting the following error:

########### make call
first
second
Uncaught Kotlin exception: kotlin.native.IncorrectDereferenceException: illegal attempt to access non-shared AsyncCalc.$makeCall$lambda-0$FUNCTION_REFERENCE$0@9d0328 from other thread

Kotlin Code:

interface ApiCall {
    fun get(url: String, success: (String) -> Unit)
}

class AsyncCalc(private val apiCall: ApiCall) {

    fun makeCall() {
        apiCall.freeze()
        println("########### make call")
        apiCall.get("<http://www.example.com|www.example.com>") {
            println("########### $it")
        }.freeze()
    }
}

iOS impl:

let queue = DispatchQueue(label: "com.test.queue")

class ApiCalcImpl: ApiCall {
    func get(url: String, success: @escaping (String) -> Void) {
        print("first")
        queue.async {
            print("second")
            success("hello")
            print("third")
        }
    }
}

@main
internal class AppDelegate: UIResponder, UIApplicationDelegate {
    let test = ApiCalcImpl()

    internal func application(
        _ application: UIApplication,
        didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
    ) -> Bool {
        AsyncCalc(apiCall: test).makeCall()

        return true
    }
...

I created a multiplatform app using the Full-stack Web Application template and want to dockerize it. Using Jib to create the Docker Image. It works fine for the Jvm parts but i dont get the .js file provided by the jsBrowserProductionWebpack task in my docker container. Anyone have any experience using jib with multiplatform?

Does anybody know how to get around this error?

Initialization script ‘/private/var/folders/wp/jsq85rms0tsf2h7x_9kqfztr0000gn/T/MigrationKt_main__.gradle’ line: 27

> Could not create task ‘raptorMigrationKt.main()’.

> Could not get unknown property ‘sourceSets’ for project ‘:raptor’ of type org.gradle.api.Project.

It’s when I run a

main

function from IDE. The project is a JVM project and depends on a multi-module multiplatform library (

raptor

) which is an included Gradle build. Here’s the offending code generated by the IDE (the

else

branch):

In Kotlin JVM,

.kt

and

.java

files can exist side-by-side in the file system and you can access Kotlin functions from the Java file and vice versa. Are there any examples of doing that with JS? I'm talking within the same source set and file structure. I can't seem to figure it out.

I have a Kotlin Multiplatform library I'm trying to use from

.js

as a npm package. I can call normal functions just fine in JS, but

suspend

functions are a bit of an enigma from the

.js

side. I know I can create a wrapper in

jsMain

but I'd rather not manually do that for every suspend function. Is there any way to call a suspend function in JS and get a promise back (even if it requires a little helper function?) Here is a modified version of the Base64 library example to show what I'm trying to do. Kotlin Implementation

interface Base64Encoder {
    @JsName("encode")
    fun encode(src: ByteArray): ByteArray

    @JsName("encodeToString")
    fun encodeToString(src: ByteArray): String {
        return encode(src).let { encoded ->
            buildString(encoded.size) {
                encoded.forEach { append(it.toChar()) }
            }
        }
    }

    suspend fun downloadAndEncodeToString(url: String): String {
        return HttpClient().use {
            it.get<HttpResponse>(url = Url(url)).readText()
        }
    }
}

JS Usage (see image below)

Hello guys, I have a question, I created project with standart Android Studio KMM plugin. And then I added also my

backend

module into project as

jvm

target but surprisingly backend Module is not seeing

commonJvm

rather it sees

commonAndroid

expected values. Also I can not reach the class in

commonMain

from

backend

module. Did anyone had similar issue ? You can see the gradle.kts files in thread

Hi, it seams that

MutableStateFlow

is not suitable for MPP when multi-threading, since it will be frozen and crash. Any good replacement or knowledge if it will work eventually? My case is that I would like on Native (iOS) watch for value changes and be able to notify kotlin code when Native would like to change value. It's would be okay to have two fields, one for reading and second for writing.

For iOS KMP, are the generated methods shorter when invoking from Swift than from Obj-C?

Hey guys, I’m investigating for the company I work for if we can upgrade to Kotlin 1.4 (we are using Kotlin 1.3.70 right now), but when updating for 1.4.10 or even 1.4.20-M1 I get the following on iOS (we are building a multiplatform project):

Thread 1: EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0)

Does anyone knows what might be causing this? This is not happening on our current implementation using 1.3.70, so it might be something that might’ve changed in this new release. Any help would be really nice! Thanks in advance!

Hey everyone, I created a Gradle plugin that generates an XCFramework and a Package.swift file so that you can distribute your multiplatform library as a binary target for Apple platforms. You can find all the details on Github. Please give it a shot and let me know what you think. Looking forward for your feedback. https://github.com/ge-org/multiplatform-swiftpackage

I’m testing the just released Android Studio KMM plugin (0.1.3-release-54-Studio4.0). The announcement article says:

For both the application and tests you can set breakpoints and debug your code on iOS.

I created a new project and added a single iOS test in the shared module. Stopping on breakpoints isn’t working.

import kotlin.test.Test
import kotlin.test.assertTrue

class IosTest {
    @Test
    fun test() {
        assertTrue(false) // breakpoint here
    }
}

Hi there! I have a problem that I have spent mutliple hours on now, but I could not find a solution. So we have this situation: We are using a multiplatform library, which is published through bintray. On my machine everything works fine. On my colleagues machine it does not. One curious thing is the following. On my machine i can see in IntelliJ that all dependencies are loaded, especially the "commonmp-metadata" ... Please compare the two screenshot I attached. On my colleagues machine this some does not seem to be fetched properly and therefore things do not compile. He sees lot's of errors of unresolved symbols in the IDE while I do not. Basically non of the packages and classses from the library are recognized. What is even more strange is that "./gradlew build" does work for him, but "./gradlew assemble" does not. When running assemble the failing gradle task is "compileKotlinMetadata" on the subproject using the multiplatform lib. We have tried to see what is different in the setups of our systems. Java version 1..8.0_265 is the same. Nodejs 10.19.0 is the same. Npm 6.14.4 is the same. The only difference we can spot is that I am running Pop!Os and he runs Ubuntu. Another colleague with Ubuntu has the same issue by the way. Sooooo... long text. Does anyone have an idea what to look for? Thanks a lot.