Setup development environment for Scala.js

To write Golem components in Scala.js, a special version of wit-bindgen needs to be installed, as well as the sbt build tool and Node.js and npm.

Install WebAssembly tooling

First of all, to install wit-bindgen-scalajs via cargo, you need to install the latest stable version of Rust. The recommended way to do so is using https://rustup.rs (opens in a new tab):

curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh

rustup install stable && rustup default stable

rustup target add wasm32-wasip1

cargo install --git https://github.com/vigoo/wit-bindgen-scalajs wit-bindgen-cli --locked

wit-bindgen-scalajs --version
wit-bindgen-cli 0.37.0 (f30fdae38 2025-02-23)

Install Node.js and npm

Install Node.js and npm to your system by following the official instructions (opens in a new tab).

Install sbt

Follow the official instructions (opens in a new tab) to install sbt.