/**
 * Converts utf-16 string to a Uint8Array.
 *
 * @param str - the string to convert
 *
 * @returns the converted string
 */
export declare function strToBytes(str: string): Uint8Array;
/**
 * Converts Uint8Array to a string.
 *
 * @param arr - the array to convert
 *
 * @returns A string representation of the array in utf-8 encoding
 */
export declare function bytesToStr(arr: Uint8Array): string;