/**
 * Regex for validating ISO partial date strings (YYYY, YYYY-MM, YYYY-MM-DD).
 */
export declare const ISO_DATE_REGEX: RegExp;
/**
 * Transforms CSL-JSON date fields between internal and edit formats.
 * Internal: { "date-parts": [[2024, 3, 15]] }
 * Edit: "2024-03-15"
 */
export declare function datePartsToIso(dateParts: number[][]): string;
/**
 * Transforms ISO date string to CSL-JSON date-parts format.
 * Edit: "2024-03-15"
 * Internal: { "date-parts": [[2024, 3, 15]] }
 */
export declare function isoToDateParts(isoDate: string): number[][];
/**
 * Transforms a CSL date object to ISO string for editing.
 */
export declare function transformDateToEdit(date: {
    "date-parts"?: number[][];
} | undefined): string | undefined;
/**
 * Transforms an ISO date string back to CSL date object.
 */
export declare function transformDateFromEdit(isoDate: string): {
    "date-parts": number[][];
};
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