name : quarterOfYear.d.ts import { PluginFunc, ConfigType, QUnitType } from 'dayjs' declare const plugin: PluginFunc export = plugin declare module 'dayjs' { interface Dayjs { quarter(): number quarter(quarter: number): Dayjs add(value: number, unit: QUnitType): Dayjs subtract(value: number, unit: QUnitType): Dayjs startOf(unit: QUnitType): Dayjs endOf(unit: QUnitType): Dayjs isSame(date: ConfigType, unit?: QUnitType): boolean isBefore(date: ConfigType, unit?: QUnitType): boolean isAfter(date: ConfigType, unit?: QUnitType): boolean } }