declare namespace Intl {
    type DateTimeFormatPartTypes = "day" | "dayPeriod" | "era" | "hour" | "literal" | "minute" | "month" | "second" | "timeZoneName" | "weekday" | "year";

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

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