# Kotlin Toolchain 0.12: Multiplatform Library Publishing, Wasm Apps, and More

DevFeed: [Kotlin Toolchain 0.12: Multiplatform Library Publishing, Wasm Apps, and More](<https://devfeed.tech/articles/kotlin-toolchain-0-12-multiplatform-library-publishing-wasm-apps-and-more-8794.md>)

Original publisher: [Read original article](<https://blog.jetbrains.com/kotlin/2026/09/kotlin-toolchain-0-12-multiplatform-library-publishing-wasm-apps-and-more/>)

Author: Joffrey Bion

Published: 2026-09-03T10:40:05Z

Content type: release

Language: en

Sources: [Kotlin : A concise multiplatform language developed by JetBrains | The JetBrains Blog](<https://devfeed.tech/sources/kotlin-a-concise-multiplatform-language-developed-by-jetbrains-the-jetbrains-blog.md>)

Topics: [toolchain](<https://devfeed.tech/topics/toolchain.md>), [multiplatform](<https://devfeed.tech/topics/multiplatform.md>), [compose-hot-reload](<https://devfeed.tech/topics/compose-hot-reload.md>), [web applications](<https://devfeed.tech/topics/web-applications.md>), [Spring Boot 4](<https://devfeed.tech/topics/spring-boot-4.md>)

Tags: [compose-hot-reload](<https://devfeed.tech/tags/compose-hot-reload.md>), [gradle](<https://devfeed.tech/tags/gradle.md>), [intellij-idea](<https://devfeed.tech/tags/intellij-idea.md>), [kotlin](<https://devfeed.tech/tags/kotlin.md>), [multiplatform](<https://devfeed.tech/tags/multiplatform.md>), [news](<https://devfeed.tech/tags/news.md>), [publication](<https://devfeed.tech/tags/publication.md>), [releases](<https://devfeed.tech/tags/releases.md>), [toolchain](<https://devfeed.tech/tags/toolchain.md>), [toolchains](<https://devfeed.tech/tags/toolchains.md>), [wasm](<https://devfeed.tech/tags/wasm.md>)

## AI overview

Kotlin Toolchain 0.12.0 adds multiplatform library publishing and previews support for building Wasm modules as web applications. It also includes command-line Compose Hot Reload and changes intended to reduce Maven Central publication files.

## Source excerpt

Kotlin Toolchain 0.12.0 is out. This release brings some long-awaited features: multiplatform libraries publication, a preview of Wasm application support, Compose Hot Reload from the command line, and more. Read on for the details, and check the release notes for the full list of changes and bug fixes. Additionally, klibs.io now uses the Kotlin Toolchain [...]