type WeekdayKey = 'mon' | 'tue' | 'wed' | 'thu' | 'fri' | 'sat' | 'sun';
type HHMM = `${number}${number}:${number}${number}`;
type SlotInput = {
    open: HHMM;
    close: HHMM;
};
type DaySpec = 'closed' | SlotInput[];
type Holiday = {
    date: string;
    closed?: boolean;
    slots?: SlotInput[];
    note?: string;
};
type Exception = {
    date: string;
    closed?: boolean;
    slots?: SlotInput[];
    note?: string;
};
type Config = {
    timezone: string;
    week: Record<WeekdayKey, DaySpec>;
    holidays?: Holiday[];
    exceptions?: Exception[];
    locale?: string;
    firstDayOfWeek?: WeekdayKey;
    strictValidation?: boolean;
};
type DateLike = Date | string;
type OpenCloseWindow = {
    start: Date;
    end: Date;
};
type CloseAt = {
    at: Date;
};
type BusinessHours = {
    isOpenNow(): boolean;
    isOpenAt(date: DateLike): boolean;
    nextOpen(from?: DateLike): OpenCloseWindow | null;
    nextClose(from?: DateLike): CloseAt | null;
    currentSlot(at?: DateLike): {
        open: Date;
        close: Date;
    } | null;
    timeUntilClose(at?: DateLike): {
        ms: number;
        minutes: number;
    } | null;
    timeUntilOpen(at?: DateLike): {
        ms: number;
        minutes: number;
    } | null;
    todaysSlots(at?: DateLike): Array<{
        open: Date;
        close: Date;
    }>;
    slotsOn(date: DateLike): Array<{
        open: Date;
        close: Date;
    }>;
    weeklySummary(options?: {
        join?: boolean;
    }): string[] | string;
    listUpcomingSlots(daysAhead?: number): Array<{
        date: string;
        slots: Array<{
            open: Date;
            close: Date;
        }>;
    }>;
    withOverrides(overrides: Partial<Config>): BusinessHours;
    toJSON(): Config;
};

declare function createBusinessHours(config: Config): BusinessHours;

declare function formatSlot(slot: {
    open: Date;
    close: Date;
}, options?: {
    locale?: string;
    timezone?: string;
}): string;
declare function formatDayName(weekday: WeekdayKey, options?: {
    locale?: string;
}): string;

declare function toJSON(config: Config): Config;

declare function fromJSON(configLike: Config): BusinessHours;

export { type BusinessHours, type CloseAt, type Config, type DateLike, type DaySpec, type Exception, type HHMM, type Holiday, type OpenCloseWindow, type SlotInput, type WeekdayKey, createBusinessHours, formatDayName, formatSlot, fromJSON, toJSON };