/**
 * @param text      {string}   - The text waiting for being added with separators
 * @param size      {int}      - The text chunk length
 * @param separator {string}
 * @returns         {string}   - The text with separators
 * @throws          {ISError}
 *   1  invalid_text
 *   2  invalid_size
 *   3  invalid_separator
 */
declare function insert_separator(text: string, size: number, separator: string): string;
export { insert_separator };