📦✨ your favorite rust -> wasm workflow tool!
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Add three build profiles and infrastructure for their toml config
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📦✨ wasm-pack

Your favorite rust -> wasm workflow tool!

Build Status Build status

This tool seeks to be a one-stop shop for building and working with rust- generated WebAssembly that you would like to interop with JavaScript, in the browser or with Node.js. wasm-pack helps you build and publish rust-generated WebAssembly to the npm registry to be used alongside any other javascript package in workflows that you already use, such as webpack or greenkeeper.

This project is a part of the rust-wasm group. You can find more info by visiting that repo!


🔮 Prerequisities

This project requires Rust 1.30.0 or later.

🎙️ Commands

  • init (⚠️ DEPRECATED): This command has been deprecated since release 0.5.0, in favor of build. 0.4.2 and previous use this command.
  • build: Generate an npm wasm pkg from a rustwasm crate
  • pack and publish: Create a tarball of your rustwasm pkg and/or publish to a registry

📝 Logging

We generate a wasm-pack.log file if wasm-pack errors on you, and you can customize the log verbosity using the verbosity flag.

Verbosity Result
-v All Info, Warn, and Errors are logged
-vv All Debug, Info, Warn, and Errors are logged
-vvv All Trace, Debug, Info, Warn, and Errors are logged

👯 Contributing

Read our guide on getting up and running for developing wasm-pack, and check out our contribution policy.

⚡ Quickstart Guide

  1. Write a crate in Rust.
  2. Add wasm-bindgen to your Cargo.toml:
crate-type = ["cdylib"]

wasm-bindgen = "0.2"
  1. Add this to the top of your src/lib.rs:
extern crate wasm_bindgen;

use wasm_bindgen::prelude::*;
  1. Annotate your public functions with #[wasm_bindgen], for example:
extern {
    pub fn alert(s: &str);

pub fn greet(name: &str) {
    alert(&format!("Hello, {}!", name));
  1. Install this tool: cargo install wasm-pack
  2. Run wasm-pack build, optionally, pass a path to a dir or a scope (see above for details)
  3. This tool generates files in a pkg dir
  4. To publish to npm, run wasm-pack publish. You may need to login to the registry you want to publish to. You can login using wasm-pack login.