swc_ecma_transforms_base 44.0.1

rust port of babel and closure compiler.
Documentation 
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function _async_iterator(iterable) {
    var method, async, sync, retry = 2;
    for ("undefined" != typeof Symbol && (async = Symbol.asyncIterator, sync = Symbol.iterator); retry--;) {
        if (async && null != (method = iterable[async])) return method.call(iterable);
        if (sync && null != (method = iterable[sync])) return new AsyncFromSyncIterator(method.call(iterable));
        async = "@@asyncIterator", sync = "@@iterator";
    }
    throw new TypeError("Object is not async iterable");
}
function AsyncFromSyncIterator(s) {
    function AsyncFromSyncIteratorContinuation(r) {
        if (Object(r) !== r) return Promise.reject(new TypeError(r + " is not an object."));
        var done = r.done;
        return Promise.resolve(r.value).then(function(value) {
            return { value: value, done: done };
        });
    }
    return AsyncFromSyncIterator = function(s) {
        this.s = s, this.n = s.next;
    },
        AsyncFromSyncIterator.prototype = {
            s: null,
            n: null,
            next: function() {
                return AsyncFromSyncIteratorContinuation(this.n.apply(this.s, arguments));
            },
            return: function(value) {
                var ret = this.s.return;
                return void 0 === ret
                    ? Promise.resolve({ value: value, done: !0 })
                    : AsyncFromSyncIteratorContinuation(ret.apply(this.s, arguments));
            },
            throw: function(value) {
                var thr = this.s.return;
                return void 0 === thr ? Promise.reject(value) : AsyncFromSyncIteratorContinuation(thr.apply(this.s, arguments));
            }
        },
        new AsyncFromSyncIterator(s);
}