/**
 * Extract year, month & day from an ISO 8601 string representation of a date.
 *
 * `yyyy-mm-dd` & `yyyy-mm` are the most common formats, but others are handled too.
 *
 * - Handles negative years
 * - Ignores any time or timezone information in the given string
 *
 * @param isoDateString A string containing an ISO 8601 date
 * @returns An object containing `year`, `month` & `day` properties extracted from the string
 * @returns `null` if no date was found in the string
 */
export declare function dateParts(isoDateString: string): {
    year: number;
    month: number;
    day?: number;
} | null;
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