Experiments with compiling Kotlin to Wasm Component, linking it with an example component written in Rust, transpiling it to JS + Core Wasm using jco, and running the result in Node.js.

Checkout skuzmich/cm-prototype branch of Kotlin somewhere and install it to mavenLocal:

cd path/to/kotlin
./gradlew install --parallel

Install recent Rust toolchain and add wasm32-unknown-unknown target:

rustup target add wasm32-unknown-unknown

Install wasm-tools

cargo install wasm-tools

Install Node.js with canary V8 with WasmGC support, for example via NVM:

NVM_NODEJS_ORG_MIRROR=https://nodejs.org/download/v8-canary nvm install 21.0.0-v8-canary20231019bd785be450

Install jco and preview2-shim

npm install

Install the latest experimental wit-bindgen CLI with Kotlin support via cargo:

cargo install wit-bindgen-cli --git https://github.com/skuzmich/wit-bindgen --branch kotlin

./run.sh