Example of executing ES module exports from Rust

Last update: Dec 13, 2022

Overview

rusty_esm

This is an example showcasing a common use case for embedding Deno - calling JS module exports from Rust. The rest is pretty self explainatory:

// main.rs
#[derive(Debug, Deserialize)]
struct ApiResponse {
  user_id: isize,
  id: isize,
  title: String,
  completed: bool,
}

let mut rt = Runtime::new("testdata/basic.js").await?;
let id = 5;
let value: ApiResponse = rt.call("getStuff", &[id]).await?;

// testdata/basic.js
export async function getStuff(id) {
  const r = await fetch("https://jsonplaceholder.typicode.com/todos/" + id);
  return await r.json();
}

$ target/debug/deno_embed
ApiResponse {
    user_id: 0,
    id: 5,
    title: "laboriosam mollitia et enim quasi adipisci quia provident illum",
    completed: false,
}

Benchmarks

Measured for Runtime::call in example scenarios. See src/main.rs.

test tests::bench_call         ... bench:       4,429 ns/iter (+/- 1,139)
test tests::bench_call_promise ... bench:       4,609 ns/iter (+/- 306)

License

MIT

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