use wasm_bindgen::prelude::*;
#[wasm_bindgen] pub fn add(a: i32, b: i32) -> i32 { a + b }

wasm-pack build --target web

import init, { add } from './pkg/wasm.js';
await init(); add(2, 3);

rustc --target wasm32-wasi main.rs -o app.wasm
wasmtime app.wasm

interface math { add: func(a: s32, b: s32) -> s32 }

import wasm from './processor.wasm';
export default {
  async fetch(req) {
    const inst = await WebAssembly.instantiate(wasm);
    return new Response(inst.exports.process(req.body));
  }
};