/**
 * DJB2 算法 —— 将字符串散列为十六进制字符串
 * @param {string} input
 * @returns {string}
 */
export function signature(input: string): string;
/**
 * 去除字符串首尾指定字符
 * @param {string} str
 * @param {string} char
 * @returns {string}
 */
export function trim(str: string, char: string): string;
/**
 * 将字符串编码为 Uint8Array
 * @param {string} str
 * @returns {Uint8Array}
 */
export function str2uint8array(str: string): Uint8Array;
/**
 * 将 ArrayBuffer 解码为字符串
 * @param {ArrayBuffer} buffer
 * @returns {string}
 */
export function uint8array2str(buffer: ArrayBuffer): string;