Are there any KMM sample projects that have a nested multi module library architecture like so: • Repository (KMM Library) ◦ Local (KMM Library) ◦ Remote (KMM Library) where each KMM module/library can be published as a maven repository while also making development comparatively easy (in terms of switching between published maven artefact and sourcecode during development)

Swift offers the possibility to omit argument names when calling a function if the function is declared like

func foo(_ arg: Bar) {}

. I.e., you can just

foo(myArg)

instead of having to

foo(arg: myArg)

It’s probably not possible to declare a function in kotlin that behaves the same way at the swift callsite, right?

What is the recommended project structure for KMM applications? 1. One single git project containing both native apps as well as their shared logic. 2. Two git projects - one containing android native and shared and other containing iOS native (We currently have this) 3. Three git projects one for each Android, iOS and shared. Is this even possible?

Hello guys, what IDE are you using for KMM applications?

Hi all!. Not sure if anyone has done this before, but I’m trying to consume a

Flow<State>

from a shared

ViewModel

, in a Typescript react app (not using kotlin react wrappers). This is how that looks like

// View.tsx
export function View() {
    const viewModel = new JsViewModel()
    const [state, setState] = useState(viewModel.initialState)

    useEffect(() => {
        viewModel.subscribe((state) => { setState(state) })
    })
    
    return ( 
        <p>{state.value}</p>
    )
}

// ViewModel.kt
@JsExport
class JsViewModel {
  ...
  private val viewModel: ViewModel by viewModel()

  fun subscribe(
    onChange: (state: State) -> Unit,
  ) {
    viewModel.launch {
      viewModel.states.collect { state -> onChange(state) }
    }
  }
}

This pretty much works, but there’s a

collect

launched, which is technically not managed. Is there a better way to hookup the kotlin flow with the react hook?

I've started a tutorial/blog 🤓 I hope it will help beginners on their journey in the world of Kotlin Multiplatform! https://hlnstepanova.github.io/kmpizza/

Hey all. What is the actual way to set different artifact IDs when publishing a KMP project?

publishing {
    publications.withType<MavenPublication> {
        artifactId = "custom-name"
        configureMavenPom(project)
        signing { if (isRelease) sign(this@withType) }
    }
}

This will create a publication with the right name for the artifact but appears to be causing a bug when actually trying to use it. Someone is having the same issue here: https://stackoverflow.com/questions/70489135/unable-to-use-published-kmp-library-due-[…]o-error-detecting-cycle-in-external-va/70490150?noredirect=1 So my IDE can detect the dependency that I published (above), but Gradle cannot seem to resolve it. The actual error message:

Detecting cycle in external variants for :
my.dependency:dependency:version: //<---- the one i published (above)
  - my.other.project:other:version
Dependency resolution has ignored the cycle to produce a result. It is recommended to resolve the cycle by upgrading one or more dependencies.

Working on understanding the overall setup for KMM, currently working on the Android portion. Two questions I have (which I believe are related): • What's the difference between the

/androidApp

portion and the

/shared/src/androidMain

? • Is it possible for an

expect

declaration in the shared code (

/shared/src/commonMain

) to find its

actual

implementation in the

/androidApp

portion?

Hello! I have a project which is multiplatform (all code is in src/commonMain). Now, I'm not actually interested in mobile or iOS, or even native maybe, and I'd like to add a JVM library to the project. I've added the dependency in gradle (`implementation("io.github.quillraven.fleks:Fleks:1.0-RC1")`and IntelliJ has downloaded the code from mavenCentral to "external libraries". But neither IntelliJ nor gradle can build the project, which the confusing error message "Unresolved reference: com". The "com" in

import com.github.quillraven.fleks.World

is highlighted red too. So.... what do I do?

Hi guys, I have one doubt regarding the Kotlin Multiplatform framework, I want to create a library that can be used on most platforms, mainly targeting: • js (node, to be used with react-native or a front-end framework) • Android • iOS Is Kotlin Multiplatform a viable option to it? What would be the artifacts generated for each of those options and does anyone have an example? (edited)

Hi, is it safe to use

kotlin Number

type to represent monetary value?

Hi, getting following error when trying to share a jvm target in desktop and android targets

Could not determine the dependencies of task ':desktop:run'.
> Could not resolve all task dependencies for configuration ':desktop:jvmRuntimeClasspath'.
   > Could not resolve project :common.
     Required by:
         project :desktop
      > The consumer was configured to find a runtime of a component, as well as attribute 'org.jetbrains.kotlin.platform.type' with value 'jvm'. However we cannot choose between the following variants of project :common:
          - commonJvmDefault
          - commonJvmRuntimeElements
          - desktopDefault
          - desktopRuntimeElements

gradle files posted in thread.

I have published a library to our maven (tried maven local too), and it has one transitive dependency. The consuming project does not see this transitive dependency and fails to compile. Although I can see that both "library.pom" and "library-jvm.pom" list this library under

<dependencies>

section. Does anyone know why this can happen and how to fix this? Adding the dependency directly to a consuming project works, but I'd like to avoid requiring users of my library do that manually.

Hey guys, what is a possible reason of this build failure?

e: Compilation failed: null

 * Source files: 
 * Compiler version info: Konan: 1.6.10 / Kotlin: 1.6.10
 * Output kind: FRAMEWORK

e: java.lang.NullPointerException
	at org.jetbrains.kotlin.backend.konan.optimizations.DataFlowIR$SymbolTable.mapClassReferenceType(DataFlowIR.kt:520) ...

I got it when trying to execute linkMultiplatformAppReleaseFrameworkIosArm64 gradle task

Has anyone benchmarked the new Kotlin native memory model vs the old one? I’d be curious.

Hi Guys , How do you handle caching in shared kmm modules ?

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Hi, want to get your opinion about documentation best practices with multiplatform code. Do you document both expect/actual classes? If yes, do you document functions in expect/actual as well? Note. By documenting, I mean kdoc.

Hi guys 🙂, I’m not able to configure KMM project so it uses

native-mt

coroutines and works on apple silicon ios simulator. Did anybody make it work please ?

Who knows if

gradle 7.3.3

is supported by KMM plugin? I've found that unit tests for native platform can't be run.

How do framework names on iOS map to Platform specific app packages ? For e.g. I am trying to find

os_signpost_emit_with_type

, and I can't seem to find it. https://developer.apple.com/documentation/os/os_signpost_emit_with_type?language=objc

Hey so tried to follow most of the multi-platform instructions (https://play.kotlinlang.org/hands-on/Full Stack Web App with Kotlin Multiplatform) and I was able get my app working locally.. The problem that I am seeming to have is that my index.html uses a line

<script src="myJS.js"></script>

but when my frontend tries to request that JS file from my Ktor server it response with 404 .. (the request made is http//:host:port/myJs.js)I followed the steps to copy myJr.js into my jar file but still seems like the file can't be found.. Also to be clear when I run jsBrowser[Development/Production]Run everything works correctly. But that is likely because webpack dev server is serving js file Also I would like to mention that when I manually create an endpoint get("/myJs.js") and return static resource myJs.js all seems to work as expected not sure what I am missing .. any help or suggestions would be appreciated

Hi! Does anyone have example projects that build Objective-C directly into an iOS target? Is it possible to just include a handful of

.m

and

.h

files that way so I can use them in some

actual

implementations? Or do I have to somehow build a library of the

.m

files and link against that? I'm trying to follow the Gradle examples here but my iOS build is failing to find my header. Not sure if I have to adjust my Xcode project to include the header file or what. Any help is greatly appreciated!

i am trying to opt-in for

@ExperimentalTime

in my multi-platform module - but the following doesnt work :

sourceSets {
    all {
        languageSettings.optIn("kotlin.time.ExperimentalTime")
    }
}

languageSettings

cant be found

languageSettings.optIn("kotlin.time.ExperimentalTime")
                   ^ Unresolved reference: languageSettings

anyine know what am i missing? this seems to be exactly as per the documentation page https://kotlinlang.org/docs/opt-in-requirements.html#module-wide-opt-in i'm updating to

1.6.10

Hi folks, there is anyway to have

expect interface

with a

expect val property: String

that should be defined with

actual get() =

? The currently interface I want to move to multiplatform looks something like this:

interface Screen : Serializable {
  val key: String
     get() = this::class.qualiedName ?: error()
}

So it was

Serializable

, I'm expect/actual for the JVM version to have Serializable (Android need it), and the key I'm not able to use expect/actual.

Can I use value classes in shared code from Swift? I defined in my shared code this:

@JvmInline
value class PhotoUri(val value: String)

In Swift

PhotoUri

is not defined according to the error message. Attributes that use it seem to be of type

Any

now. If I change that to an data class it's available. How can I use value classes with Kotlin v1.6.10?

Hi, is it possible to include a KMM Library (target Android and iOS) into a plain Android Application using Gradle Composite Builds (using

includeBuild

)? If yes, are there any working examples?

Does anybody know a workaround to create a fat framework on macOS? https://youtrack.jetbrains.com/issue/KT-47355

val xcf = XCFramework()
fun KotlinNativeTarget.config() {
    binaries {
        framework {
            baseName = "shared"
            export("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.6.0")
            xcf.add(this)
        }
    }
}
iosArm64 { config() }
iosSimulatorArm64 { config() }
macosArm64 { config() }
macosX64 { config() }

iOS targets work without any problem, macOS fails with `Fat frameworks are not supported for platform `macos_arm64``

Hey folks! I'm observing strange behaviour when running

./gradlew connectedAndroidTest

where my shared module unit tests inside

src/commonTest/kotlin

also run as part of the Android instrumented tests. Anyone experienced this before? 🤔 More details in 🧵