You don't have to wait for web components though. If the authors of said libraries split it up in two parts, the main logic and framework/library integration, the sharing would be possible today already.

I think tools like xState gets this right, you can glance the package listing here: https://github.com/davidkpiano/xstate/tree/master/packages

Then you just include core + framework X integration, and if you need a new integration, you create it new and use it together with core.