wasm-pack/docs/prerequisites.md

Prerequisites

Rust and npm

Before installing wasm-pack, you should make sure that you have already installed Rust and npm. You can confirm that these are installed using the following commands:

# Check if Rust is installed.
cargo --version

# Check if npm is installed.
npm --version

You can find more information about installing Rust here and more information about installing npm here.

Sign Up For npm

You will need to create an npm account if you plan on publishing your package to the npm public registry. You can find information about signing up for npm here.