import { ByteArray } from '../types.js';
/**
 * Unescapes a PDF literal string by processing escape sequences.
 * Handles escape sequences for special characters including newlines, tabs,
 * backslashes, parentheses, and octal character codes.
 *
 * @param input - The escaped byte array to unescape.
 * @returns A new byte array with escape sequences converted to their literal values.
 *
 * @example
 * ```typescript
 * // Unescapes '\n' to a literal newline
 * unescapeString(new Uint8Array([0x5c, 0x6e])) // Returns Uint8Array([0x0a])
 * ```
 */
export declare function unescapeString(input: ByteArray): ByteArray;