The following tools are required or optionally usable for most the supported guest languages.

First of all, to install wasm-tools via cargo, you need to install the latest stable version of Rust. The recommended way to do so is using https://rustup.rs:

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


rustup install stable && rustup default stable


rustup target add wasm32-wasi

Then install the supported version of the wasm-tools tool via cargo:

cargo install wasm-tools@1.0.40


wasm-tools --version


wasm-tools 1.0.40

For Tier 2 guest languages you also need wit-bindgen (except for Rust where it is encapsulated by cargo-component):

cargo install wit-bindgen-cli@0.11.0


wit-bindgen --version


wit-bindgen-cli 0.11.0

An optional tool for making the wasm modules smaller (recommended for Swift) is wasm-opt

First you need to install the latest version of Go:

brew install golang

Then use it to install wasm-opt:

go install github.com/gonowa/wasm-opt@latest