declare function dayjs (config?: dayjs.ConfigType, option?: dayjs.OptionType): dayjs.Dayjs
export default dayjs

declare namespace dayjs {
  export type ConfigType = string | number | Date | Dayjs

  export type OptionType = { locale: string, utc: boolean }

  export type UnitType = 'millisecond' | 'second' | 'minute' | 'hour' | 'day' | 'week' | 'month' | 'quarter' | 'year' | 'date'

  interface DayjsObject {
    years: number
    months: number
    date: number
    hours: number
    minutes: number
    seconds: number
    milliseconds: number
  }

  class Dayjs {
    constructor (config?: ConfigType)

    clone(): Dayjs

    isValid(): boolean

    year(): number

    month(): number

    date(): number

    day(): number

    hour(): number

    minute(): number

    second(): number

    millisecond(): number

    set(unit: UnitType, value: number): Dayjs

    add(value: number, unit: UnitType): Dayjs

    subtract(value: number, unit: UnitType): Dayjs

    startOf(unit: UnitType): Dayjs

    endOf(unit: UnitType): Dayjs

    format(template?: string): string

    diff(dayjs: Dayjs, unit: UnitType, float?: boolean): number

    valueOf(): number

    unix(): number

    daysInMonth(): number

    toDate(): Date

    toArray(): number[]

    toJSON(): string

    toISOString(): string

    toObject(): DayjsObject

    toString(): string

    isBefore(dayjs: Dayjs): boolean

    isSame(dayjs: Dayjs): boolean

    isAfter(dayjs: Dayjs): boolean

    isLeapYear(): boolean

    locale(arg1: any, arg2?: any): Dayjs

    utc(): Dayjs

    local(): Dayjs

    isUTC(): boolean

    utcOffset(): number
  }

  export function utc(config?: ConfigType, option?: OptionType): Dayjs

  export type PluginFunc = (option: ConfigType, d1: Dayjs, d2: Dayjs) => void

  export function extend(plugin: PluginFunc, option?: ConfigType): Dayjs

  export function locale(arg1: any, arg2?: any): string

  export function isDayjs(d: any): d is Dayjs
}