ferrosaur

ferrosaur derives statically-typed Rust code — à la wasm-bindgen — for deno_core::JsRuntime to interface with your JavaScript code.

If you have:

// lib.js
export const slowFib = (n) =>
  n === 0 ? 0 : n === 1 ? 1 : slowFib(n - 1) + slowFib(n - 2);

... and you write:

// lib.rs
use ferrosaur::js;

#[js(module("lib.js"))]
struct Math;

#[js(interface)]
impl Math {
    #[js(func)]
    fn slow_fib(&self, n: serde<usize>) -> serde<usize> {}
}

... then you get:

// let rt: &mut JsRuntime;
let lib = Math::main_module_init(rt).await?;
let fib = lib.slow_fib(42, rt)?;
assert_eq!(fib, 267914296);

tip

This is like the inverse of deno_core::op2:

#[op2] gives JavaScript programs easy access to your Rust implementation.
ferrosaur gives your Rust program easy access to JavaScript implementations.

License

This project is released under the Apache 2.0 License and the MIT License.