build.gradle

buildscript {
    ext.kotlin_version = '1.3.21'

    repositories {
        jcenter()
        maven { url 'https://dl.bintray.com/kotlin/kotlin-eap' }
    }

    dependencies {
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        classpath "org.jetbrains.kotlin:kotlin-frontend-plugin:0.0.45"
    }
}

group = 'org.jetbrains.kotlin.example'
version = '0.0.1-SNAPSHOT'

apply plugin: 'kotlin2js'
apply plugin: 'kotlin-dce-js'
apply plugin: 'org.jetbrains.kotlin.frontend'

repositories {
    jcenter()
}

dependencies {
    compile "org.jetbrains.kotlin:kotlin-stdlib-js:$kotlin_version"
    testCompile "org.jetbrains.kotlin:kotlin-test-js:$kotlin_version"
}

kotlinFrontend {
    downloadNodeJsVersion = "latest"

    npm {
//        dependency("kotlin", "1.1.0")
        dependency "style-loader"

        devDependency("karma")
    }

    webpackBundle {
        bundleName = "main"
        contentPath = file('src/main/web')
//        mode = 'development'
        mode = 'production'
    }

    define "PRODUCTION", false
    define "X", false

//    rollupBundle {
//        bundleName = "rolledUp"
//    }

//    allBundles {
//        /* set properties for all bundles */
//    }

//    bundle("someBundler") {
//        ....
//    }
}

compileKotlin2Js {
    kotlinOptions.metaInfo = true
    kotlinOptions.outputFile = "$project.buildDir.path/js/${project.name}.js"
    kotlinOptions.sourceMap = true
    kotlinOptions.moduleKind = 'commonjs'
    kotlinOptions.main = "call"
}

compileTestKotlin2Js {
    kotlinOptions.metaInfo = true
    kotlinOptions.outputFile = "$project.buildDir.path/js-tests/${project.name}-tests.js"
    kotlinOptions.sourceMap = true
    kotlinOptions.moduleKind = 'commonjs'
//    kotlinOptions.moduleName = project.name + "-test"
    kotlinOptions.main = "call"
}