Returns a promise of the count of items returned by evaluating the provided iterable
async function count(source) {
    var e_33, _a;
    let i = 0;
    try {
        for (var source_4 = __asyncValues(source), source_4_1; source_4_1 = await source_4.next(), !source_4_1.done;) {
            const it = source_4_1.value;
            ++i;
        }
    }
    catch (e_33_1) { e_33 = { error: e_33_1 }; }
    finally {
        try {
            if (source_4_1 && !source_4_1.done && (_a = source_4.return)) await _a.call(source_4);
        }
        finally { if (e_33) throw e_33.error; }
    }
    return i;
}