schedule returning isValid() = true but next(10) returns an array of undefineds

[netei]

var s2 = {
  "schedules": [{"m":[0,15,30,45],s:0}],
  "exceptions":[]
};

var n1 = later.schedule(s2).isValid();
var n2 = later.schedule(s2).next(10);
console.log(n1);
console.log(n2);

outputs :

true
[ undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined ]

I now know that the s key needs to be an array : [0] instead of 0.

Still, I think it is a bug that the isValid() returns true, isn't it ?

[bunkat]

isValid(date) is used to determine if a particular date is valid based on the schedule, not if the schedule itself is valid. It unfortunately returns true for invalid schedules as a side affect of assuming that the schedule is properly formed. Is might be interesting to add a isScheduleValid() function but that doesn't currently exist.

[netei]

Ok, I get that, isScheduleValid would indeed be helpful

[fabiomig]

So how to validate if the current date is valid to a schedule?

[jeandat]

Is there a way to validate a cron expression in this library ?