First, we need to install Rust. Though it is possible to install it using Homebrew, we recommend installing rustup using the approach on the Rust homepage:

https://www.rust-lang.org/tools/install

It will most likely involve simply running:

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

Once you have rustup and Rust, we need to install dependencies for building Rust Wasm.

rustup target add wasm32-unknown-unknown
cargo install wasm-pack

Building

Run the following script inside spark-internal/rust:

./build_rust_wasm.sh

You can also build it manually by running these commands:

cd spark-internal-rs
wasm-pack build --target web

The generated files will be in the pkg/ subdirectory, which is already symlinked in spark-internal/package.json.