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114 lines
4.1 KiB
Markdown
114 lines
4.1 KiB
Markdown
<div align="center">
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<h1><code>wasm-bindgen</code></h1>
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<p>
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<strong>Facilitating high-level interactions between Wasm modules and JavaScript.</strong>
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</p>
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<p>
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<a href="https://dev.azure.com/rustwasm/wasm-bindgen/_build/latest?definitionId=1&branchName=master"><img src="https://img.shields.io/azure-devops/build/rustwasm/wasm-bindgen/1.svg?style=flat-square" alt="Build Status" /></a>
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<a href="https://crates.io/crates/wasm-bindgen"><img src="https://img.shields.io/crates/v/wasm-bindgen.svg?style=flat-square" alt="Crates.io version" /></a>
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<a href="https://crates.io/crates/wasm-bindgen"><img src="https://img.shields.io/crates/d/wasm-bindgen.svg?style=flat-square" alt="Download" /></a>
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<a href="https://docs.rs/wasm-bindgen"><img src="https://img.shields.io/badge/docs-latest-blue.svg?style=flat-square" alt="docs.rs docs" /></a>
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</p>
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<h3>
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<a href="https://rustwasm.github.io/docs/wasm-bindgen/">Guide</a>
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<span> | </span>
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<a href="https://docs.rs/wasm-bindgen">API Docs</a>
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<span> | </span>
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<a href="https://github.com/rustwasm/wasm-bindgen/blob/master/CONTRIBUTING.md">Contributing</a>
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<span> | </span>
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<a href="https://discordapp.com/channels/442252698964721669/443151097398296587">Chat</a>
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</h3>
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<sub>Built with 🦀🕸 by <a href="https://rustwasm.github.io/">The Rust and WebAssembly Working Group</a></sub>
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</div>
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## Example
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Import JavaScript things into Rust and export Rust things to JavaScript.
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```rust
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use wasm_bindgen::prelude::*;
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// Import the `window.alert` function from the Web.
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#[wasm_bindgen]
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extern "C" {
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fn alert(s: &str);
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}
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// Export a `greet` function from Rust to JavaScript, that alerts a
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// hello message.
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#[wasm_bindgen]
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pub fn greet(name: &str) {
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alert(&format!("Hello, {}!", name));
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}
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```
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Use exported Rust things from JavaScript with ECMAScript modules!
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```js
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import { greet } from "./hello_world";
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greet("World!");
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```
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## Features
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* **Lightweight.** Only pay for what you use. `wasm-bindgen` only generates
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bindings and glue for the JavaScript imports you actually use and Rust
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functionality that you export. For example, importing and using the
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`document.querySelector` method doesn't cause `Node.prototype.appendChild` or
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`window.alert` to be included in the bindings as well.
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* **ECMAScript modules.** Just import WebAssembly modules the same way you would
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import JavaScript modules. Future compatible with [WebAssembly modules and
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ECMAScript modules integration][wasm-es-modules].
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* **Designed with the ["Web IDL bindings" proposal][webidl-bindings] in mind.**
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Eventually, there won't be any JavaScript shims between Rust-generated wasm
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functions and native DOM methods. Because the wasm functions are statically
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type checked, some of those native methods' dynamic type checks should become
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unnecessary, promising to unlock even-faster-than-JavaScript DOM access.
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[wasm-es-modules]: https://github.com/WebAssembly/esm-integration
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[webidl-bindings]: https://github.com/WebAssembly/webidl-bindings/blob/master/proposals/webidl-bindings/Explainer.md
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## Guide
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[**📚 Read the `wasm-bindgen` guide here! 📚**](https://rustwasm.github.io/docs/wasm-bindgen/)
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You can find general documentation about using Rust and WebAssembly together
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[here](https://rustwasm.github.io/docs).
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## API Docs
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- [wasm-bindgen](https://docs.rs/wasm-bindgen)
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- [js-sys](https://docs.rs/js-sys)
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- [web-sys](https://docs.rs/web-sys)
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- [wasm-bindgen-futures](https://docs.rs/wasm-bindgen-futures)
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## License
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This project is licensed under either of
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* Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
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http://www.apache.org/licenses/LICENSE-2.0)
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* MIT license ([LICENSE-MIT](LICENSE-MIT) or
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http://opensource.org/licenses/MIT)
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at your option.
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## Contribution
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**[See the "Contributing" section of the guide for information on
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hacking on `wasm-bindgen`!][contributing]**
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Unless you explicitly state otherwise, any contribution intentionally submitted
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for inclusion in this project by you, as defined in the Apache-2.0 license,
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shall be dual licensed as above, without any additional terms or conditions.
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[contributing]: https://rustwasm.github.io/wasm-bindgen/contributing/index.html
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