method Temporal.PlainYearMonth.add
#PlainYearMonth.add(duration: DurationLike,options?: OverflowOptions,): PlainYearMonthParameters #
#duration: DurationLike #options: OverflowOptions optional
#PlainYearMonth.add(duration: DurationLike,options?: OverflowOptions,): PlainYearMonth#duration: DurationLike #options: OverflowOptions