import { Option } from './types';
/**
 * encode: encode string to morse code.
 * - msg: strings need to be encode.
 * - option: encode option.
 *
 * Return the morse code.
 *
 * Usage
 * var option = {
 *  space: ' ',
 *  long: '-',
 *  short: '*'
 * };
 * encode('I love you.', option);
 * Will get return with `** *-** --- ***- * -*-- --- **- *-*-*-`.
 *
 **/
export declare function encode(msg: string, option?: Option): string;