declare namespace Intl {

    interface DateTimeFormatPartTypesRegistry {
        day: any
        dayPeriod: any
        era: any
        hour: any
        literal: any
        minute: any
        month: any
        second: any
        timeZoneName: any
        weekday: any
        year: any
    }

    type DateTimeFormatPartTypes = keyof DateTimeFormatPartTypesRegistry;

    interface DateTimeFormatPart {
        type: DateTimeFormatPartTypes;
        value: string;
    }

    interface DateTimeFormat {
        formatToParts(date?: Date | number): DateTimeFormatPart[];
    }
}