threads.js: Packaging with zeit/pkg doesn't seem to work properly

Hi,

just tried to package a simple app which uses threads.js with https://github.com/zeit/pkg and it didn’t seem to work that nicely. There is no error displayed on packaging, but when running the app i’m greeted with:

pkg/prelude/bootstrap.js:1176
      throw error;
      ^

Error: Cannot find module '../config'
1) If you want to compile the package/file into executable, please pay attention to compilation warnings and specify a literal in 'require' call.
2) If you don't want to compile the package/file into executable and want to 'require' it from filesystem (likely plugin), specify an absolute path in 'require' call using process.cwd() or process.execPath.
    at Function.Module._resolveFilename (module.js:545:15)
    at Function.Module._resolveFilename (pkg/prelude/bootstrap.js:1278:46)
    at Function.Module._load (module.js:472:25)
    at Module.require (module.js:594:17)
    at Module.require (pkg/prelude/bootstrap.js:1157:31)
    at require (internal/module.js:11:18)
    at Object.<anonymous> (C:\snapshot\WebstormProjects\some-project\node_modules\threads\lib\worker.node\worker.js:18:15)
    at Module._compile (pkg/prelude/bootstrap.js:1252:22)
    at Object.Module._extensions..js (module.js:661:10)
    at Module.load (module.js:563:32)

The line in question requireing is in lib\worker.node\worker.js:18:15.

I use the threads.js as follows:

const threads = require('threads');

const thread = threads.spawn(`${__dirname}/worker.js`);

Anybody has solved this yet or got pointers on what might be the culprit?