3 ms·

Impossible due to how async is implemented (as generators).

• pitaj 7y ago
  JS async is implemented as generators as well AFAIK
  • dlbucci 7y ago
    Not unless promises are implemented with generators. I dunno though, I feel like there's some overlap between the two concepts, so maybe they are?
    • pitaj 7y ago
      Promises are just objects which represent an asynchronous value. Async/await are coroutines: they have a shared context, stack, etc. They can be paused and resumed. The implementation of async/await depends on the engine, but I'm pretty sure they use the same generator backend. Babel and other transpilers convert async functions actual generator functions. By contrast, promises are a fairly simple runtime library.
  • Scooty 7y ago
    I'm not sure how they're handled internally, but async functions are no longer generators. For a while after generators and before async/await, generators were used as a polyfill.
    • pitaj 7y ago
      Because of how similar they are, it would make sense to implement async/await using existing generator backends in the VM, right?