[🐞] Objects and object properties can't be forwarded

[DzmVasileusky]

Describe the bug

Many third-party scripts are initialising global objects allowing to use its methods and properties (e.g. AppcuesBundleSettings.accountId).
Unfortunately object or non-functional object property can't be forwarded it seems.
Example of object:

const Foo {
  id: '123',
  func: () => {}
}

So Foo.func can be forwarded and used, while Foo.id isn't accessible.
Tried to set it in all the following ways with no luck (either returns 'undefined' or function definition from partytown):

partytown = {
  forward: ['Fooj', 'Foo.id'],
  globalFns: ['Foo', 'Foo.id']
};

Reproduction

https://82qcgq-5000.csb.app/

Steps to reproduce

1. Open the link
2. Open the console.log
3. Refresh to see the initial log

Browser Info

Any

Additional Information

Feel free to convert to an Improvement if there is no any workaround

[mdrmtz]

Workaround using custom events to pass information or call objects from the main thread to Partytown or vice versa.

[DzmVasileusky]

@mdrmtz Can you give an example of a custom event usage for this?
Do you mean calling window.postMessage from a loaded via partytown script and send an object inside?

Using loadScriptsOnMainThread isn't an option really when we can just not use partytown for it. It is more like a workaround when we want a tag script being called via partytown while the loaded script on the main thread. Not sure how much optimisation it provides.