import type { PDFObject } from './pdf-object.ts';
/**
 * Converts a primitive value to its corresponding PDFObject representation.
 */
export declare function toPDFObject(value: PDFObject | string | number | boolean | null): PDFObject;
/**
 * Formats a Date object as a PDF date string.
 * PDF date format: D:YYYYMMDDHHmmSSOHH'mm'
 * where O is the timezone offset sign (+, -, or Z).
 */
export declare function formatPDFDate(date: Date): string;
/**
 * Formats a Date object as an ISO 8601 date string for use in XMP metadata.
 * Format: YYYY-MM-DDThh:mm:ss+HH:MM (or Z for UTC).
 */
export declare function formatISO8601Date(date: Date): string;
/**
 * Computes a hash of the data for deduplication using the djb2
 * algorithm by Daniel J. Bernstein.
 */
export declare function computeHash(data: Uint8Array): string;