setTimeOut y crear directorio nodejs

function Job {
    function taskA() {
        return new Promise(resolve => {
            setTimeout(function() {
                resolve('result A');
            }, 1000);
        });
    }
    function taskB(arg) {
        return new Promise(resolve => {
            setTimeout(function() {
                resolve('result B of ' + arg);
            }, 1000);
        });
    }
    // would allow this chain:
    this.work = () => {
        taskA()
            .then(resA => taskB(resA))
            .then(resB => console.log(resB));
    }
}
Bah Keith