Add dependencies on Kotlin libraries to Kotlin/Wasm project

You can use the Kotlin standard library (stdlib) and test library (kotlin.test) in Kotlin/Wasm out of the box. The version of these libraries is the same as the version of the kotlin-multiplatform plugin.

Other official Kotlin (kotlinx) and multiplatform libraries are not fully supported yet. You can try experimental versions of such libraries by adding the Kotlin experimental repository to your Gradle project.

Supported Kotlin libraries for Kotlin/Wasm

You can use one of the following repositories to add Kotlin libraries to your project:

Maven Central for stdlib and kotlin.test libraries:
// build.gradle.kts repositories { mavenCentral() }
Custom Maven repository for experimental Kotlin/Wasm artifacts:
// build.gradle.kts repositories { maven("https://maven.pkg.jetbrains.space/kotlin/p/wasm/experimental") }
Custom Maven repository for Compose Multiplatform dev artifacts:
// build.gradle.kts repositories { maven("https://maven.pkg.jetbrains.space/public/p/compose/dev/") }

Library	Version	Repository
stdlib	1.9.21	Maven Central
kotlin-test	1.9.21	Maven Central
kotlinx-coroutines	1.7.2-wasm3	Custom for experimental Kotlin/Wasm artifacts
Compose Multiplatform	1.5.10-dev-wasm02	Custom for experimental Kotlin/Wasm artifacts
Compose Compiler	1.5.3	Maven Central
kotlinx-serialization	1.6.1-wasm0	Custom for experimental Kotlin/Wasm artifacts
Ktor	3.0.0-wasm1	Custom for experimental Kotlin/Wasm artifacts
kotlinx-atomicfu	0.22.0-wasm2	Custom for experimental Kotlin/Wasm artifacts
kotlinx-collections-immutable	0.4-wasm1	Custom for experimental Kotlin/Wasm artifacts
kotlinx-datetime	0.4.1-wasm1	Custom for experimental Kotlin/Wasm artifacts
skiko	0.0.7.85-wasm01	Custom for Compose Multiplatform dev artifacts

Enable libraries in your project

To set a dependency on a library, such as kotlinx.serilization and kotlinx.coroutines, update your build.gradle.kts file:

// `build.gradle.kts`

repositories {
    maven("https://maven.pkg.jetbrains.space/kotlin/p/wasm/experimental")
}

kotlin {
    sourceSets {
        val wasmMain by getting {
            dependencies {
                implementation("org.jetbrains.kotlinx:kotlinx-serialization-core-wasm:1.5.1-wasm0")
                implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core-wasm:1.6.4-wasm0")
                implementation("io.ktor:ktor-client-core-wasm:2.3.1-wasm0")
            }
        }
    }
}

What's next?

Explore the Kotlin/Wasm interoperability with JavaScript

Last modified: 03 November 2023