Options
interface Options {
byeaster: number | null;
byhour: number | number[] | null;
byminute: number | number[] | null;
bymonth: number | number[] | null;
bymonthday: number | number[] | null;
bynmonthday: number[] | null;
bynweekday: number[][] | null;
bysecond: number | number[] | null;
bysetpos: number | number[] | null;
byweekno: number | number[] | null;
byyearday: number | number[] | null;
count: number | null;
dtstart: Date | null;
freq: Frequency;
interval: number;
tzid: string | null;
until: Date | null;
wkst: Weekday | number | null;
}