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https://github.com/fluencelabs/wasm-bindgen
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9b5d47f5e1
Currently the `wasm-gc-api` crate doesn't expose `parity_wasm::Module` as a public dependency which means that whenever we want to run a GC (which is twice per `wasm-bindgen` invocation) we have to serialize and reparse the module a lot! The `wasm-bindgen` has to serialize, `wasm-gc` then parses, `wasm-gc` then serializes, and `wasm-bindgen` then parses. This commit sidesteps all of these operations by ensuring that we always use the same `parity_wasm::Module` instance, even when multiple versions of the `parity_wasm` crate are in use. We'll get a speed boost when they happen to align (which they always should for `wasm-bindgen`), but it'll work even if they aren't aligned (by going through serialization). Concretely on my machine this takes a `wasm-bindgen` invocation from 0.5s to 0.2s, a nice win!
wasm-bindgen
Facilitating high-level interactions between wasm modules and JavaScript.
Introduction blog post: "JavaScript to Rust and Back Again: A wasm-bindgen Tale"
Import JavaScript things into Rust and export Rust things to JavaScript.
src/lib.rs:
#![feature(use_extern_macros)]
extern crate wasm_bindgen;
use wasm_bindgen::prelude::*;
// Import the `window.alert` function from the Web.
#[wasm_bindgen]
extern {
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!
index.js:
// Asynchronously load, compile, and import the Rust's WebAssembly
// and JavaScript interface.
import("./hello_world").then(module => {
// Alert "Hello, World!"
module.greet("World!");
});
Guide
📚 Read the wasm-bindgen guide here! 📚
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.