Looking for some feedback, is this the best way to accomplish getting the vpcZones (availability zones) in use by the vpc?

export const vpcZones = vpc.privateSubnetIds.then(function(subnetIds) {
    return subnetIds.map(function (id) {
        return id.apply(id => {
            return aws.ec2.getSubnet({id: id}).availabilityZone;
        });
    });
});