/**
 * This method converts ASCII characters to [trytes](https://docs.iota.org/docs/getting-started/0.1/introduction/ternary).
 *
 * ## Related methods
 *
 * To convert trytes to ASCII characters, use the [`trytesToAscii()`]{@link #module_converter.trytesToAscii} method.
 *
 * @method asciiToTrytes
 *
 * @summary Converts ASCII characters to trytes.
 *
 * @memberof module:converter
 *
 * @param {string} input - ASCII input
 *
 * @example
 * ```js
 * let trytes = Converter.asciiToTrytes('Hello, where is my coffee?');
 * ```
 *
 * @return {string} Trytes
 *
 * @throws {errors.INVALID_ASCII_CHARS}: Make sure that the `input` argument contains only valid ASCII characters.
 */
export declare const asciiToTrytes: (input: string) => string;
/**
 * This method converts trytes to ASCII characters.
 *
 * Because each ASCII character is represented as 2 trytes, the given trytes must be of an even length.
 *
 * ## Related methods
 *
 * To convert ASCII characters to trytes, use the [`asciiToTrytes()`]{@link #module_converter.asciiToTrytes} method.
 *
 * @method trytesToAscii
 *
 * @summary Converts trytes to ASCII characters.
 *
 * @memberof module:converter
 *
 * @param {string} trytes - An even number of trytes
 *
 * @example
 * ```js
 * let message = Converter.trytesToAscii('IOTA');
 * ```
 *
 * @return {string} ASCII characters
 *
 * @throws {errors.INVALID_TRYTES}: Make sure that the `trytes` argument contains only valid trytes (A-Z or 9).
 * @throws {errors.INVALID_ODD_LENGTH}: Make sure that the `trytes` argument contains an even number of trytes.
 */
export declare const trytesToAscii: (trytes: string) => string;