This is mainly useful for authoring libraries that are compatible with both backends, see below. BOTH compiles your project with the new IR compiler as well as the default compiler backend.LEGACY uses the default compiler backend.IR uses the new IR compiler backend for Kotlin/JS.To enable it in your project, pass a compiler type to the js function in your Gradle build script: The IR compiler backend is available starting with Kotlin 1.4.0 through the Kotlin/JS Gradle plugin.
Kotlin klib code#
For Kotlin/JS, this enables aggressive optimizations, and allows improvements on pain points that were present in the previous compiler, such as generated code size (through dead code elimination), and JavaScript and TypeScript ecosystem interoperability, to name some examples. Kotlin source code is first transformed into a Kotlin intermediate representation (IR), which is subsequently compiled into JavaScript. Rather than directly generating JavaScript code from Kotlin source code, the Kotlin/JS IR compiler backend leverages a new approach. The Kotlin/JS IR compiler backend is the main focus of innovation around Kotlin/JS, and paves the way forward for the technology. You are welcome to use the IR compiler backend, but all of the functionality, language and tooling features described in this document are subject to change in future Kotlin versions. As of Kotlin 1.4.0, the Kotlin/JS IR compiler has Alpha stability level.
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