wasm-bindgen 0.2.91

Easy support for interacting between JS and Rust.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131

<div align="center">

  <h1><code>wasm-bindgen</code></h1>

  <p>
    <strong>Facilitating high-level interactions between Wasm modules and JavaScript.</strong>
  </p>

  <p>
    <a href="https://github.com/rustwasm/wasm-bindgen/actions/workflows/main.yml?query=branch%3Amain"><img src="https://github.com/rustwasm/wasm-bindgen/actions/workflows/main.yml/badge.svg?branch=main" alt="Build Status" /></a>
    <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>
    <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>
    <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>
  </p>

  <h3>
    <a href="https://rustwasm.github.io/docs/wasm-bindgen/">Guide</a>
    <span> | </span>
    <a href="https://docs.rs/wasm-bindgen">API Docs</a>
    <span> | </span>
    <a href="https://github.com/rustwasm/wasm-bindgen/blob/master/CONTRIBUTING.md">Contributing</a>
    <span> | </span>
    <a href="https://discord.gg/xMZ7CCY">Chat</a>
  </h3>

  <sub>Built with 🦀🕸 by <a href="https://rustwasm.github.io/">The Rust and WebAssembly Working Group</a></sub>
</div>

## Install `wasm-bindgen-cli`

You can install it using `cargo install`:

```
cargo install wasm-bindgen-cli
```

Or, you can download it from the
[release page](https://github.com/rustwasm/wasm-bindgen/releases).

If you have [`cargo-binstall`](https://crates.io/crates/cargo-binstall) installed,
then you can install the pre-built artifacts by running:

```
cargo binstall wasm-bindgen-cli
```

## Example

Import JavaScript things into Rust and export Rust things to JavaScript.

```rust
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!

```js
import { greet } from "./hello_world";

greet("World!");
```

## Features

* **Lightweight.** Only pay for what you use. `wasm-bindgen` only generates
  bindings and glue for the JavaScript imports you actually use and Rust
  functionality that you export. For example, importing and using the
  `document.querySelector` method doesn't cause `Node.prototype.appendChild` or
  `window.alert` to 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][wasm-es-modules].

* **Designed with the ["Web IDL bindings" proposal][webidl-bindings] 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.

[wasm-es-modules]: https://github.com/WebAssembly/esm-integration
[webidl-bindings]: https://github.com/WebAssembly/proposals/issues/8

## Guide

[**📚 Read the `wasm-bindgen` guide here! 📚**](https://rustwasm.github.io/docs/wasm-bindgen/)

You can find general documentation about using Rust and WebAssembly together
[here](https://rustwasm.github.io/docs).

## API Docs

- [wasm-bindgen](https://docs.rs/wasm-bindgen)
- [js-sys](https://docs.rs/js-sys)
- [web-sys](https://docs.rs/web-sys)
- [wasm-bindgen-futures](https://docs.rs/wasm-bindgen-futures)

## License

This project is licensed under either of

 * Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
   http://www.apache.org/licenses/LICENSE-2.0)
 * MIT license ([LICENSE-MIT](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`!][contributing]**

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.

[contributing]: https://rustwasm.github.io/docs/wasm-bindgen/contributing/index.html