Introduction: Sample multiplatform library in Kotlin with tests and publishing
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This project contains a no-op multiplatform library targeting JVM, JS and Native, along with tests and publishing set up. It has a common module with expect declarations and common tests, platform-specific actual implementations and tests and corresponding Gradle build files.

You can use it as a reference for how one can do some tasks that are not ready out of the box with Kotlin Multiplatform Technology, namely:

  • Run JavaScript tests with Mocha
  • Publish multiplatform libraries to Bintray

Not implemented yet:

  • Integrate with dokka to produce JavaDoc artifacts for JVM
  • Publish sources jar

Using in your library project

Add dependencies and repositories to the buildscript section:

buildscript {
    repositories {
        maven { url "" }
    dependencies {
        classpath "com.moowork.gradle:gradle-node-plugin:$gradle_node_version"
        classpath "com.jfrog.bintray.gradle:gradle-bintray-plugin:$bintray_plugin_version"

Apply maven-publish plugin

apply plugin: 'maven-publish'

Copy these files from gradle directory of this project to your project

  • node-js.gradle – installs node and sets up node_modules directory
  • pom.gradle – configures pom.xml for publishing
  • publish.gradle – creates publishing tasks
  • test-mocha-js.gradle – creates tasks for running JS tests with Mocha

Import these files into your Gradle file after the kotlin section with targets and source sets:

apply from: rootProject.file("gradle/publish.gradle")
apply from: rootProject.file('gradle/node-js.gradle')
apply from: rootProject.file('gradle/test-mocha-js.gradle')

Enable Gradle Metadata (experimental feature) in settings.gradle:


Consult file in this project for what you need to configure for testing and publishing. Pay special attention to a section about at the end of it.

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