Built with ?? by The Rust and WebAssembly Working Group
Example
Import JavaScript things into Rust and export Rust things to JavaScript.
use wasm_bindgen::prelude::*;
// Import the `window.alert` function from the Web.
#[wasm_bindgen]
extern "C" {
fn alert(s: &str);
}
// Export a `greet` function from Rust to JavaScript, that alerts a
// hello message.
#[wasm_bindgen]
pub fn greet(name: &str) {
alert(&format!("Hello, {}!", name));
}
Use exported Rust things from JavaScript with ECMAScript modules!
import { greet } from "./hello_world";
greet("World!");
Features
-
Lightweight. Only pay for what you use.
wasm-bindgenonly generates
bindings and glue for the JavaScript imports you actually use and Rust
functionality that you export. For example, importing and using the
document.querySelectormethod doesn't causeNode.prototype.appendChildor
window.alertto be included in the bindings as well. -
ECMAScript modules. Just import WebAssembly modules the same way you would
import JavaScript modules. Future compatible with WebAssembly modules and
ECMAScript modules integration. -
Designed with the "Web IDL bindings" proposal in mind.
Eventually, there won't be any JavaScript shims between Rust-generated wasm
functions and native DOM methods. Because the wasm functions are statically
type checked, some of those native methods' dynamic type checks should become
unnecessary, promising to unlock even-faster-than-JavaScript DOM access.
Guide
? Read the wasm-bindgen guide here! ?
You can find general documentation about using Rust and WebAssembly together
here.
API Docs
License
This project is licensed under either of
- Apache License, Version 2.0, (LICENSE-APACHE or
http://www.apache.org/licenses/LICENSE-2.0) - MIT license (LICENSE-MIT or
http://opensource.org/licenses/MIT)
at your option.
Contribution
See the "Contributing" section of the guide for information on
hacking on wasm-bindgen!
Unless you explicitly state otherwise, any contribution intentionally submitted
for inclusion in this project by you, as defined in the Apache-2.0 license,
shall be dual licensed as above, without any additional terms or conditions.