/**
 *
 * @param {string[]} maskWithoutSpecialChars An array of characters with the unfinished mask
 * @param {[string, number][]} specialCharsDescr An array of tuples. Each tuple contains a string and a position (What string to add in a particular position)
 * @param {number} maskedPos Current masked position
 * @param {string} lastKeyCode Last key code of the user
 * @returns {[string, number]} A tuple containing the final mask and the final masked position
 */
export declare const addSpecialCharacters: (maskWithoutSpecialChars: string[], specialCharsDescr: [string, number][], maskedPos: number, lastKeyCode: string) => [string, number];