Deno v1.1.2でWebAssembly System Interface (WASI)が使えるようになったので試す

fn main() {
  println!("hello")
}

rustup target add wasm32-wasi
rustc --target wasm32-wasi main.rs # main.wasm がつくられる

import WASI from "https://deno.land/std/wasi/snapshot_preview1.ts";
const wasi = new WASI({});
const binary = await Deno.readFile("main.wasm");
const module = await WebAssembly.compile(binary);
const instance = await WebAssembly.instantiate(module, {
  wasi_snapshot_preview1: wasi.exports,
});
wasi.memory = instance.exports.memory;
instance.exports._start();

deno run --allow-read main.ts # => hello