In https://github.com/facebook/hermes/blob/master/doc/Features.md Proxy is listed as Excluded From Support. With

Hermes plans to target ECMAScript 2015 (ES6), with some carefully considered exceptions.

What are those considerations regarding Proxy?

Especially some library in JS environnement like:

• mobx 5
• immer
  rely on proxy support. It is super usefully to add observability upon an object access which helps building reactive apps.

Would it be technically possible to have support as an external / optionnal *. aar so it does bot affect the size of hermes ?

Solves:

• Problem with MobX 5+ : Your environment doesn't support Symbol and Proxy objects. #28