method Temporal.PlainYearMonth.prototype.add
#PlainYearMonth.prototype.add(durationLike: ,options?: ArithmeticOptions,): Temporal.PlainYearMonthParameters #
#durationLike: optional
#options: ArithmeticOptions#PlainYearMonth.prototype.add(durationLike: ,options?: ArithmeticOptions,): Temporal.PlainYearMonth#durationLike: #options: ArithmeticOptions