Progress on const, let and async functions

[AlexanderEggers]

I noticed that in https://github.com/facebook/hermes/blob/main/doc/Features.md, there are a few items which are unclear which part of these features are missing/still in progress:

• let and const (block scoped variables, with support for the temporal dead zone)
• Async function (async and await)

I have a project running with Hermes which is using these language features, so I am having a hard time understanding this part of your documentation. I would appreciate it, if someone could clarify that for me.

[neildhar]

Hi @AlexanderEggers

• let and const in Hermes are currently on hold, but we've found that babel transforms can cover most use cases (see Lacking support for ES6 block scoping #575 for more context)
• Async functions are currently supported, and you should be able to use them

We're also working on making the feature documentation more comprehensive (#701).

[AlexanderEggers]

Thanks for the quick answer @neildhar. 👍