SOURCE

function to(promise) {
    return promise
        .then(data => {
            return [null, data];
        })
        .catch(err => [err]);
}

async function asyncTask(cb) {
    let err, user, savedTask;
    console.log(111, savedTask)
    [err, user] = await to(Promise.resolve('error1'));

    if (!user) return cb("No user found");

    [err, savedTask] = await to(Promise.resolve('error2'));

    if (err) return cb("Error occurred while saving task");

    cb(null, savedTask);
}

asyncTask((v, k) => {
    console.log(222, v, k)
})