TypeError: #<Promise> could not be cloned.

[justinmann]

I am trying to create an async function in unsafe JS that can invoke an async function and return a value.

This code can call the async function "test" from the unsafe script, but when it try to return it produces the error "TypeError: # could not be cloned."

Node.js v18.19.0
isolated-vm v4.7.2

const context = await isolate.createContext();
 await context.global.set(
   'test',
   new ivm.Callback(
     async (a: string) => {
       console.log(a);
       return a;
     },
     { async: true },
   ),
 );

 const script = `async function execute(a) { await test(a) }`;
 const fn = await isolate.compileScript(script);
 await fn.run(context);
 const fnReference = await context.global.get('execute', { reference: true });
 const result = await fnReference.apply(undefined, ['FOO'], {
   result: { promise: true },
 });
 console.log(result);

[siddharthvp]

It can be done by using a Reference instead of a Callback. See #322 (comment). Also, you appear to be missing a return in the execute function.