setInterval method
Implementation
int setInterval(String vmId, VoidCallback function, int milliseconds) {
final Map<int, JSInterval> cache = _globalCache.putIfAbsent(vmId, () => <int, JSInterval>{});
final JSInterval interval = JSInterval(function, milliseconds);
final int intervalId = interval.id;
cache[intervalId] = interval;
interval.emit();
return intervalId;
}