kotlinlang #multiplatform

hi everyone, small, what feels like a newbie question. I'm looking into using kotlin multiplatform to build some libraries for android/ios and javascript. I'm getting stuck on the gradle JS setup for our unit tests though. It seems most docs online use kotlin2js for doing things like installing mocha and populating nodemodules, but adding the kotlin2JS module with the multiplatform module returns the following error

Cannot add extension with name 'kotlin', as there is an extension already registered with that name.

This link, https://youtrack.jetbrains.com/issue/KT-32137?_ga=2.97965660.2132659469.1572979841-1716587075.1572304917, seems to suggest that support docs for multiplatform JS gradle is getting updated. Does anyone know if this is still accessible (I can't seem to connect to it via slack) or has an example gradle file that uses multiplatform to trigger a mocha run? Thank you!

Shan

11/08/2019, 4:32 AM

Anyone had any experience using Jitpack with a multiplatform library? Gradle is refusing to resolve my snapshots despite seemingly producing the correct artifacts and maven components.

Sylvain Patenaude

11/08/2019, 4:57 PM

I turned on system diagnostics on my macOS-10.14 cloud agent and by looking at the generated build files, I noticed that the following outputs were identified as directories rather than files: - .../build/bin/ios/debugFramework/MySDK.framework (directory) - .../build/bin/ios/releaseFramework/MySDK.framework (directory) Any idea?

Dmitri Sh

11/09/2019, 5:26 AM

JB guys - I know this question was asked before (I know because I checked), but have to ask it again. When are we going to have KTOR iOS client Websockets library? Someone from JB said "ASAP" like six months ago. I know all is relative, but six months for ASAP is kind of... long 😥

Jérôme Gully

11/09/2019, 11:48 AM

Hi, is there a kotlin multiplatform gradle plugin reference somewhere ? like the ones for the android gradle plugin(http://google.github.io/android-gradle-dsl/current/). I searched but no result.

Andy Gibel

11/09/2019, 7:48 PM

Since top level functions are turned into static calls via Objective C headers - Is there a clean way to consolodate all my files under a singular "static class" instead of having names correlating to each of the files the functions are defined in?

basher

11/10/2019, 8:42 PM

We're interested to know if other teams used autodesk/Coroutineworker to help temporarily fill the Kotlin/Native multithreaded coroutines gap in their mpp projects. DM's open as well (if you want to be known privately and not listed in the readme). As MPP grows, there will likely be more opportunity to open source projects like this, which will eventually be deprecated with JB support/libraries https://twitter.com/benasher44/status/1193625968268591104?s=20

❤️ 1

nrobi

11/11/2019, 8:20 AM

Anyone with some help, why I can’t reference my classes in my common module from my backend module?

Kurt Renzo Acosta

11/11/2019, 9:56 AM

Hi, guys! How do you declare flavors for Kotlin/Native? In Android I have two release types (Debug and Release) and two flavors (Dev and Production) so I have: - devDebug - devRelease - productionDebug - productionRelease I wanted to have these in iOS too but I can't seem to find any configuration so I only have Debug and Release for it. If I'm missing something, please do point me in the right direction. Many thanks!

Anastasia Finogenova

11/11/2019, 10:45 PM

Hey, is there a way to use K/N and Flutter together in my cross platform app at the moment?

nrobi

11/12/2019, 8:07 AM

Hey, in my common I have three targets: iOS, android, jvm(for backend). For some reason I’m getting multiple errors, related to

kotlin-stdlib

, however in my

commonMain

sourceSet I’ve added the dependency. Anyone with some help?

Sergio Casero

11/12/2019, 6:58 PM

Hello guys, I'm getting a strange behaviour when trying to catch error. The thing is, I have this function to handle errors with views:

protected fun onRetry(error: Error, retry: () -> Unit): Unit =  view.showRetry(errorHandler.convert(error)) { retry() }

Where

view

is an interface that

activities

view controllers

implement On android everything work as expected, the showRetry() function is called, but... on iOS, the app doesn't crash but

showRetry()

is not called The thing is that xCode detects the function, and I need to implement it as expected, but the function is never called

mbonnin

11/13/2019, 6:13 PM

Is there a MPP equivalent to

ByteArrayOutputStream

? Something that: • I can write to • Grows automatically • I can get a

ByteArray

from once I'm done

Brandon Saunders

11/13/2019, 7:49 PM

Hi multiplatform, I'm trying to get a multiplatform setup similar to a co-worker who is also working on the same codebase. we have a MP kotlin module that has been built, grabbed the iOS framework file and dropped that into a swift host project to consume it. I've booted up AppCode and dropped in the kotlin source to the host project and am attempting to set breakpoints. The project runs, the kotlin code is being executed, I can set breakpoints, but upon start the breakpoints show up as unable to be hit. Per my co-worker for him it just magically worked when the source files were dropped in. Is there something I'm missing to make the link between the framework file and the underlying source?

Dmitri Sh

11/14/2019, 3:21 AM

How do we represent Date in kotlinx serializable model in common code?

nrobi

11/14/2019, 7:07 AM

Is there a way to exclude a target from an

expected

class declaration? Or we should stick to modularizing more our common code?

akapanina

11/14/2019, 11:54 AM

Hi folks! We are working on new Kotlin website version - and there will be more info about Kotlin Multiplatform for new users. Right now we are looking for some github projects that we could show. Some examples are really well known - like DroidCon app by Touchlab, or SQLDelight library. I've also met many lovely pet projects (Galway Bus app is my personal favourite, probably because I'm a little bit obsessed with Ireland). But there is a huge chance we've missed something, and I would like to ask for your help to fix it 🙂 If you know some cool Kotlin MPP projects (as I mentioned above, hobby projects are also important) - please, share them in this thread. If you have Kotlin MPP in your production app, it's not published on github, but you would like to share its name and a little background - what feature was implemented with MPP - it also will be helpful. Our team would be extremely grateful to you.

👍 27

+11

Sylvain Patenaude

11/15/2019, 9:52 PM

Slowly but surely. When I build on iOS with

gradlew build iosTest

, I get an error like this:

Task 'iosTest' is ambiguous in root project 'MySDK'. Candidates are: 'iosTestBinaries', 'iosTestKlibrary', 'iosTestProcessResources'.

The iOS part of my build.gradle looks like this: kotlin { iosX64("ios") { binaries { framework() } } sourceSets { commonMain { dependencies { implementation kotlin('stdlib-common') } } iosMain { } iosTest { } } }

Akhil Sunny

11/16/2019, 2:14 AM

Hi folks - I am a newbie to kotlin - trying to test kotlinjs output with mocha framework - tests are running , but the html report file generated is showing 0 tests(/build/classess/reports/tests/test/index.html). Can anyone pls help out here ? looking for a report in html/xml format. Thanks!!

compileKotlin2Js {
    kotlinOptions {
        metaInfo = true
        outputFile = "${project.buildDir.path}/classes/main/${project.name}.js"
        sourceMap = true
        sourceMapEmbedSources = "always"
        moduleKind = 'umd'
    }
}
compileTestKotlin2Js { kotlinOptions.moduleKind = 'umd' }
task populateNodeModules(type: Copy, dependsOn: compileTestKotlin2Js) {
    from compileKotlin2Js.destinationDir
    configurations.testCompile.each {
        from zipTree(it.absolutePath).matching { include '*.js' }
    }
    into "${buildDir}/node_modules"
}
node {
    download = true
}
task installMocha(type: NpmTask) {
    args = ['install', 'mocha']
}
task yarnInstall(type: YarnTask) {
    args = ['install']
}
task runMocha(type: NodeTask, dependsOn: [compileTestKotlin2Js, populateNodeModules,yarnInstall, installMocha]) {
    script = file('node_modules/mocha/bin/mocha')
    args = [compileTestKotlin2Js.outputFile]
}
task runTest {
    dependsOn runMocha
}
test.dependsOn runTest

altavir

11/16/2019, 2:29 PM

Does anybody know if current MPP plugin works with JUnit5? I tried it, but did not manage it to work.

darkmoon_uk

11/17/2019, 3:33 AM

Returned to working on iOS/MP after some time away and found the situation with AppCode/Xcode/MPP compatibility has become complicated. What version of each are people using successfully at the moment?

➕ 1

bod

11/17/2019, 4:55 PM

Hello, World! I'm trying to use an extension fun from Swift and it looks like it's exported as a method that takes the receiver as its first argument (so, not usable as an extension in Swift). Is that normal / a known limitation, or am I doing something wrong? (note: it's an extension on an Interface, if that changes anything)

matej

11/18/2019, 1:44 PM

I've been thinking, one of the big advantages of Kotlin over traditional multiplatform frameworks, like Xamarin, React Native etc., seems to be that it isn't a big idea solution that wants you to marry it, "till death do us part" style. In theory, you could find out that KMP is not for your team, or your project, and relatively painlessly move to a classical native mobile approach, or even something completely different - which is not at all the case for those other frameworks. So, please correct me if I'm wrong, but on iOS, you just have the framework that gets generated, and you could keep that but ditch the KMP toolchain entirely, and piecewise replace what's in the framework, or leave it as it is and use it as a library for as long as it works. But what about Android, is there a similar route that can be taken, or, if you want to use what's in the common code, do you have to drag KMP along with you forever?

Kris Wong

11/18/2019, 3:54 PM

it seems like there is no string formatting functionality in stdlib-common. has anyone found that?

Kurt Renzo Acosta

11/19/2019, 12:56 AM

Does anyone know if there's a compiled list of the updates for MPP on 1.3.60?

thana

11/19/2019, 9:08 AM

is there any current documentation about how to set up an mpp nowadays? https://kotlinlang.org/docs/reference/building-mpp-with-gradle.html seems to be pretty putdated

Kurt Renzo Acosta

11/20/2019, 8:36 AM

Anyone having issues with cocoapods? The generated doesn't seem to generate the framework for my native module. It runs a

generateDummyFramework

and generates this

dummy.h

//! Project version number for dummy.
FOUNDATION_EXPORT double dummyVersionNumber;

//! Project version string for dummy.
FOUNDATION_EXPORT const unsigned char dummyVersionString[];

mzgreen

11/20/2019, 10:05 AM

After updating to 1.3.60 my project stopped downloading dependencies for

ios

and

macos

targets.

steenooo

11/20/2019, 12:08 PM

is it possible to have multiple multiplatform uhm... implementations that all target the same jvm version? But differ in implementation (fx for reusing code between plugins for different apps)

Cristián Arenas

11/20/2019, 12:57 PM

Hello everybody! I'm new here. How can I generate a

.framework

that works in both an iOS device and the simulator? Right now I'm changing 2 lines in my

build.gradle

every time I want to switch between targeting iosX64 (simulator) and iosArm64 (actual device).

Title

Cristián Arenas

11/20/2019, 12:57 PM

Hello everybody! I'm new here. How can I generate a

.framework

that works in both an iOS device and the simulator? Right now I'm changing 2 lines in my

build.gradle

every time I want to switch between targeting iosX64 (simulator) and iosArm64 (actual device).

These are the 2 lines I change, just in case it's relevant:

-    iosX64("ios") {
+    iosArm64("ios") {

-                implementation "io.ktor:ktor-client-serialization-iosx64:${versions.ktor}"
+                implementation "io.ktor:ktor-client-serialization-iosarm64:${versions.ktor}"

vanniktech

11/20/2019, 1:10 PM

//select iOS target platform depending on the Xcode environment variables
  val iOSTarget: (String, KotlinNativeTarget.() -> Unit) -> KotlinNativeTarget = if (System.getenv("SDK_NAME")?.startsWith("iphoneos") == true) ::iosArm64 else ::iosX64

  iOSTarget("ios") {

  }

Cristián Arenas

11/20/2019, 1:15 PM

OK, if I understand that correctly, that’ll help me automate this change, to generate the correct framework. But that does not generate a

.framework

that works on both platforms, I need to distribute the framework so it should include appropriate binaries for both architectures. Do you know how to achieve this?

vanniktech

11/20/2019, 1:16 PM

Nope. Just started with multiplatform this Sunday

Cristián Arenas

11/20/2019, 1:17 PM

Oh OK, don’t worry then 🙂

I may end up using that if I can’t figure it out 😅 It’s better than doing it manually

Artyom Degtyarev [JB]

11/20/2019, 1:34 PM

Are you talking about something like described here(https://kotlinlang.org/docs/reference/building-mpp-with-gradle.html#building-final-native-binaries) in the Building universal frameworks section*?*

Cristián Arenas

11/20/2019, 1:35 PM

Oh, I think that’s exactly what I want! I didn’t know they were called “universal frameworks”. Thanks! ❤️

tylerwilson

11/20/2019, 2:15 PM

If you are already using Cocoapods in your project, I would suggest going that route: use the cocoapods plugin that generates a podspec which you link to from your Xcode project. Then when you build your project, it will rebuild the framework (if needed) using the correct current architecture. (https://kotlinlang.org/docs/reference/native/cocoapods.html)

Konstantin Petrukhnov

11/21/2019, 4:27 AM

@Cristián Arenas One way to build universal framework: https://github.com/Ekahau/khtf-iosapp-fw/ You may also need to have bitcode enabled and making your framework dynamic.

mkojadinovic

11/22/2019, 8:31 AM

I do something like this:

iosArm64 {
        binaries {
            framework('Logger')
        }
    }

    iosX64 {
        binaries {
            framework('Logger')
        }
    }
// Create a task building a fat framework.
    task fatFramework(type: FatFrameworkTask) {
        def buildType = project.findProperty('kotlin.build.type') ?: 'DEBUG'
        baseName = "Logger"

        final File frameworkDir = new File(buildDir, "xcode-frameworks")
        destinationDir = frameworkDir

        from(
                targets.iosArm64.binaries.getFramework('Logger', buildType),
                targets.iosX64.binaries.getFramework('Logger', buildType)
        )
    }

Also, you have to add next:

iosMain {
            dependencies {
                implementation deps.coroutineNative
                implementation deps.kotlinxSerRuntimeNative

                implementation deps.ktoriOS
                implementation deps.ktorSerializationNative

                // SQL Delight
                implementation deps.sqlDelightiOS
            }
        }
        iosX64Main {
            dependsOn iosMain
            kotlin.srcDirs += project.file("src/iosMain/kotlin")
        }

        iosArm64Main {
            dependsOn iosMain
            kotlin.srcDirs += project.file("src/iosMain/kotlin")
        }

Konstantin Petrukhnov

11/25/2019, 6:06 AM

@mkojadinovic could you please share full example of build.gradle?

mkojadinovic

11/25/2019, 7:21 AM

import org.jetbrains.kotlin.gradle.tasks.FatFrameworkTask

apply plugin: "kotlin-multiplatform"
apply plugin: 'com.android.library'
apply plugin: 'kotlinx-serialization'
apply plugin: "com.squareup.sqldelight"
apply plugin: 'kotlin-kapt'

android {
    defaultConfig {
        minSdkVersion minSdk
        compileSdkVersion compileSdk
    }
    packagingOptions {
        exclude "META-INF/*"
    }

    testOptions {
        unitTests.returnDefaultValues = true
    }
}

kotlin {
    iosArm64 {
        binaries {
            framework('Logger')
        }
    }

    iosX64 {
        binaries {
            framework('Logger')
        }
    }


    // Create a task building a fat framework.
    task fatFramework(type: FatFrameworkTask) {
        def buildType = project.findProperty('kotlin.build.type') ?: 'DEBUG'
        baseName = "Logger"

        final File frameworkDir = new File(buildDir, "xcode-frameworks")
        destinationDir = frameworkDir

        from(
                targets.iosArm64.binaries.getFramework('Logger', buildType),
                targets.iosX64.binaries.getFramework('Logger', buildType)
        )
    }

    android()

    sourceSets {
        all {
            languageSettings {
                useExperimentalAnnotation('kotlin.Experimental')
            }
        }
        commonMain {
            dependencies {
                implementation deps.kotlinCommon
                implementation deps.coroutineCommon
                implementation deps.kotlinxSerRuntimeCommon

                implementation deps.ktorCore
                implementation deps.ktorSerialization

                // SQL Delight
                implementation deps.sqlDelightJVM

                implementation deps.kodeinErased
            }
        }
        commonTest {
            dependencies {
                implementation deps.kotlinReflect
                implementation deps.test.mockkCommon

                implementation deps.test.kotlinTestCommon
                implementation deps.test.kotlinAnnotCommon

                api deps.sqlDelightJVM
                api deps.test.ktorMock
            }
        }
        androidMain {
            dependencies {
                implementation deps.kotlin
                implementation deps.coroutineAndroid
                implementation deps.kotlinxSerRuntime

                implementation deps.ktorAndroid
                implementation deps.ktorSerializationJvm

                //Crashlytics
                implementation deps.crashlytics

                implementation deps.network.gson
                implementation deps.network.retrofit
                implementation deps.network.okhttp

                // SQL Delight
                implementation deps.sqlDelightAndroid

                implementation deps.kodeinErased
            }
        }
        androidTest {
            dependencies {
                implementation deps.test.kotlinTest
                implementation deps.test.kotlinTestJunit

                api deps.sqlDelightJVM

                implementation deps.test.ktorMockJvm
                implementation deps.test.kotlinTestJunit
                implementation deps.test.kotlinTest
                implementation deps.test.mockk
            }
        }
        iosMain {
            dependencies {
                implementation deps.coroutineNative
                implementation deps.kotlinxSerRuntimeNative

                implementation deps.ktoriOS
                implementation deps.ktorSerializationNative

                // SQL Delight
                implementation deps.sqlDelightiOS
            }
        }
        iosTest {
            dependencies {
                api deps.sqlDelightiOS

                api deps.test.ktorMockNative
            }
        }
        iosX64Main {
            dependsOn iosMain
            kotlin.srcDirs += project.file("src/iosMain/kotlin")
        }

        iosArm64Main {
            dependsOn iosMain
            kotlin.srcDirs += project.file("src/iosMain/kotlin")
        }
    }
}

sqldelight {
    LoggerDatabase {
        packageName = "com.example.logger"
    }
}

configurations {
    compileClasspath
}

tasks.build.dependsOn fatFramework


kapt {
    correctErrorTypes = true
    mapDiagnosticLocations = true
}

tasks.withType(org.jetbrains.kotlin.gradle.tasks.KotlinCompile).all {
    sourceCompatibility = JavaVersion.VERSION_1_8
    targetCompatibility = JavaVersion.VERSION_1_8

    kotlinOptions {
        jvmTarget = '1.8'
    }
}

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