Example for using "export default async function"

[Attacler]

Hi there,

I have been going trough the docs and trough issues to get some code to work.
The code below is the closest that i could get:

import { getQuickJS } from "quickjs-emscripten";

/**
 * Executes JavaScript code in a QuickJS VM with provided input as globals.
 * @param code The JavaScript code to execute.
 * @param input An object whose properties will be set as global variables.
 * @returns The result of the code execution, or an error message.
 */
export async function executeCodeWithInput(
  code: string,
  input: Record<string, any>
): Promise<any> {
  const QuickJS = await getQuickJS();
  const vm = QuickJS.newContext();

  // Inject input object properties as globals
  for (const [key, value] of Object.entries(input)) {
    let jsValue;
    if (typeof value === "string") {
      jsValue = vm.newString(value);
    } else if (typeof value === "number") {
      jsValue = vm.newNumber(value);
    } else {
      jsValue = vm.newString(JSON.stringify(value));
    }
    vm.setProp(vm.global, key, jsValue);
    jsValue.dispose();
  }

  // Evaluate the code as a module to support 'export default'
  const moduleEval = vm.evalCode(
    `(async () => {\n  let module = {}\n  ${code}\n  return module.default;\n})()`
  );
  let output;
  if (moduleEval.error) {
    output = { error: vm.dump(moduleEval.error) };
    moduleEval.error.dispose();
  } else {
    const fn = vm.dump(moduleEval.value);
    if (typeof fn === "function") {
      try {
        const result = await fn();
        output = { value: result };
      } catch (err) {
        output = { error: String(err) };
      }
    } else {
      output = { value: fn };
    }
    moduleEval.value.dispose();
  }

  vm.dispose();
  return output;
}

To trigger it i am using:
executeCodeWithInput("export default async function () { return 'bar'; }",{}).then(console.log)

But it always gives back:

{
    "error": {
        "name": "SyntaxError",
        "message": "unsupported keyword: export",
        "stack": "    at eval.js:3\n",
        "fileName": "eval.js",
        "lineNumber": 3
    }
}

I tried other methods (also looked at the automated tests) but it will scream about lifetimes instead of executing the code.
How can i do what i want to do?