Description

Issue

I wan't to get testdouble working on Node.js v20.0.0
Node.js v20.0.0 introduces a segregation of loader code and production code
In the changelog, they call it "Loader hooks are executed off the main thread" (https://nodejs.org/api/esm.html#modules-ecmascript-modules)

With this segregation, it is only possible to communicate via a messagePort with the loader. But this only allows to send copied values, no shared objects or modules.

Is there a way to run testdouble.js with Node v20.0.0?

Environment

• node -v output: v20.0.0
• npm -v (or yarn --version) output: npm 9.6.4
• npm ls testdouble (or yarn list testdouble) version: testdouble@3.17.2

Failing Test

Example Repo

// test.js
import * as td from 'testdouble';

await td.replaceEsm('./foo.js', { foo: () => "foomocked" });

const { print } = await import("./other.js");
print();

// other.js
import { foo } from "./foo.js";

export function print() {
    console.log("imported", foo());
}

// foo.js
export const foo = () => "foo.js"