While trunk tries to fetch tools automatically as needed (unless you're running with --offline), some pre-requisites may be required, depending on your environment.


It might be obvious, but trunk requires an installation of Rust. Not only when installing trunk itself from sources, but also for compiling the Rust-based projects to WebAssembly.

The instructions of installing Rust may vary based on your operating system, a reasonable default comes from the Rust project:

Once installed, you should have the following tools available on your command line:

  • rustup
  • cargo

WebAssembly target

By default, the Rust installation will only install the target for your current machine. However, in this case, we want to cross-compile to WebAssembly. Therefore, it is required to install the target wasm32-unknown-unknown. Assuming you have installed Rust using the standard process and can use rustup, you can add the target using:

rustup target add wasm32-unknown-unknown