Let async generators directly await an incoming promise

# Simo Costa (7 months ago)

Currently the following illustrative syntax is forbidden:

let obj = {
    async*[Symbol.asyncIterator]() {
        const res = await yield;
        // do stuff with res
     }
}

Used in this way (simple example):

const ait = obj[Symbol.asyncIterator]();

ait.next();
ait.next(p); // p is a Promise

We cannot directly write await yield. Is there any particular reason? We have to write:

let obj = {
    async*[Symbol.asyncIterator]() {
        const res = await (yield);
        // do stuff with res
     }
}
# Isiah Meadows (7 months ago)

Filed tc39/ecma262#1497 to track this. Sounds to me like a spec bug.


Isiah Meadows contact at isiahmeadows.com, www.isiahmeadows.com


Isiah Meadows contact at isiahmeadows.com, www.isiahmeadows.com