JetBrains releases Kotlin Toolchain 0.12: New multi-platform libraries and Wasm build capabilities
2026-09-07 08:23Products & Apps🔥 47.3 heat score
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On September 7, 2026, JetBrains officially released Kotlin Toolchain version 0.12. This version supports JVM, Android, iOS, and WebAssembly (Wasm) platforms. Compared to the previous version that only supported JVM, version 0.11, it enables automatic generation and unified configuration of multi-platform library files. Developers no longer need to manually select interfaces or library files; the toolchain automatically retrieves shared resources and generates corresponding versions for each target platform. Additionally, this version supports direct building and running of Wasm web applications, and is compatible with custom index.html files and npm dependencies. Meanwhile, JetBrains updated Compose Multiplatform to include a command-line Hot Reload function for runtime interface hot updates, as well as introduced the MCP server function, allowing AI agents to interact with running Compose applications.
On September 7, 2026, JetBrains officially released Kotlin Toolchain 0.12, which added multi-platform library release and Wasm application building capabilities. This version supports JVM, Android, iOS, and WebAssembly (Wasm) platforms. Compared to version 0.11, which only supported JVM, 0.12 can automatically generate library files, source code, and metadata for each platform. The build tools automatically match according to the target platform. Additionally, the toolchain supports directly building and running Wasm applications, and is compatible with custom index.html and npm dependencies. The Compose Multiplatform update also includes support for Hot Reload and MCP servers, enabling real-time interaction with AI agents.
JetBrains released Kotlin Toolchain 0.12, which adds multi-platform library publishing capabilities and supports the direct building and running of Wasm web applications. This version covers JVM, Android, iOS, and WebAssembly platforms, allowing developers to configure and generate versions for each platform using the same set of tools. During building, shared interfaces, library files, source code, and platform identification information are automatically retrieved, without the need for manual selection. Kotlin Toolchain 0.12 can directly build and run Wasm applications, supports customizing index.html and other web resources, and automatically retrieves dependent npm packages. The official version also updates Compose Multiplatform, enabling Hot Reload in the command line to load interface modifications at runtime, and adds a function to start the MCP server, allowing AI agents to interact with running Compose applications, including reloading, restarting, and obtaining window…