Build, bundle & ship your Rust WASM application to the web

”Pack your things, we’re going on an adventure!”
~ Ferris

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Trunk is a WASM web application bundler for Rust. Trunk uses a simple, optional-config pattern for building & bundling WASM, JS snippets & other assets (images, css, scss) via a source HTML file.

Getting Started


First, install Trunk via one of the following options.

Plain cargo

Download the sources and build them yourself:

cargo install --locked trunk

You can also toggle some features using the --features flag:

rustls (default)
Use rustls for client and server sockets
Enable the use of the system native TLS stack for client sockets, and `openssl` for server sockets
update_check (default)
Enable the update check on startup

NOTE: If both rustls and native-tls are enabled, rustls will be used. You can disable the default rustls using --no-default-features.

Cargo binstall

You can download a released binary from GitHub releases through binstall.

cargo binstall trunk

GitHub release download

Fetch and unpack a released binary from the release page.

For example (be sure to check for the most recent version):

wget -qO- | tar -xzf-


nix-env -i trunk


brew install trunk

Additional tools

Any additional tools like wasm-bindgen and wasm-opt are automatically downloaded and managed by trunk. Therefore, no further steps required 🎉.

Note: Until wasm-bindgen has pre-built binaries for Apple M1, M1 users will need to install wasm-bindgen manually.

cargo install --locked wasm-bindgen-cli

App Setup

Any wasm-bindgen-based framework will work with Trunk. If you're new to frontend development in Rust, Yew and Leptos are two popular options.

The easiest way to ensure that your application launches properly is to setup your app as an executable with a standard main function:

fn main() {
    // ... your app setup code here ...

Trunk uses a source HTML file to drive all asset building and bundling. Trunk also uses the official dart-sass, so let's get started with the following example. Copy this HTML to the root of your project's repo as index.html:

    <link data-trunk rel="scss" href="path/to/index.scss"/>

trunk build will produce the following HTML at dist/index.html, along with the compiled scss, WASM & the JS loader for the WASM:

    <link rel="stylesheet" href="/index-c920ca43256fdcb9.css">
    <link rel="preload" href="/index-7eeee8fa37b7636a_bg.wasm" as="fetch" type="application/wasm" crossorigin="">
    <link rel="modulepreload" href="/index-7eeee8fa37b7636a.js">
    <script type="module">
      import init, * as bindings from '/index-7eeee8fa37b7636a.js';
      window.wasmBindings = bindings;

The contents of your dist dir are now ready to be served on the web.

Next Steps

That's not all! Trunk has even more useful features. Head on over to the following sections to learn more about how to use Trunk effectively.


Anyone and everyone is welcome to contribute! Please review the document for more details. The best way to get started is to find an open issue, and then start hacking on implementing it. Letting other folks know that you are working on it, and sharing progress is a great approach. Open pull requests early and often, and please use GitHub's draft pull request feature.


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trunk is licensed under the terms of the MIT License or the Apache License 2.0, at your choosing.