Choose web-sys or stdweb

Introduction

Yew apps can be built with either web-sys or stdweb. These two crates provide the bindings between Rust and Web APIs. You'll need to choose one or the other when adding yew to your cargo dependencies:

{% code title="Cargo.toml" %}

#![allow(unused_variables)]
fn main() {
Choose `web-sys`
yew = "0.15"

Choose `stdweb`
yew = { version = "0.15", package = "yew-stdweb" }
}

{% endcode %}

We recommend using web-sys due to its support from the Rust / Wasm Working Group.

Example Usage

#![allow(unused_variables)]
fn main() {
// web-sys
let window: web_sys::Window = web_sys::window().expect("window not available");
window.alert_with_message("hello from wasm!").expect("alert failed");

// stdweb
let window: stdweb::web::Window = stdweb::web::window();
window.alert("hello from wasm!");

// stdweb with js! macro
use stdweb::js;
use stdweb::unstable::TryFrom;
use stdweb::web::Window;

let window_val: stdweb::Value = js!{ return window; }; // <- JS syntax inside!
let window = Window::try_from(window_val).expect("conversion to window failed");
window.alert("hello from wasm!");
}

The APIs for the two crates differ slightly but they serve roughly the same purpose with similar functionality.

Choosing One

There are a few different angles to consider when choosing between using web-sys and stdweb for your app. Note, it's possible to use both in one app, but to minimize the binary size of your compiled .wasm it's best to choose one or the other.