cloudflare-workers/_examples/assets/shim.mjs

import "./polyfill_performance.js";
import "./wasm_exec.js";

const go = new Go();

let mod;

export function init(m) {
    mod = m;
}

async function run() {
    const readyPromise = new Promise((resolve) => {
        globalThis.ready = resolve;
    });
    const instance = new WebAssembly.Instance(mod, go.importObject);
    go.run(instance);
    await readyPromise;
}

export async function fetch(req, env, ctx) {
    await run();
    return handleRequest(req, { env, ctx });
}