const sourceIter = (async function* () {
        for await (const item of [1, 2, 3, 4, 5]) {
            yield item;
        }
    })();

    const asyncIter = new AsyncIter(sourceIter);

    const iter =
        asyncIter
            .filter((item) => item % 2 === 0)
            .filter((item) => item > 2)
            .map((item) => item * 2)
            .map((item) => item + 1)
            .mapAsync(async (item) => item / 3)
    ;

    const result = [];
    for await (const item of iter) {
        result.push(item);
    }

    expect(result).to.deep.equal([3]);