/**
 * @title toBase64
 * @description 子串 转换为 base64
 * @param {string} value
 * @param {'utf-8'|'utf-16'} [encode='utf-8']
 * @returns {string}
 */
export declare function toBase64(value: string, encode?: 'utf-8' | 'utf-16'): string;
/**
 * @title toBase64
 * @description base64 转 子串
 * @param {string} value
 * @param {'utf-8'|'utf-16'} [encode='utf-8']
 * @returns {string}
 */
export declare function base64ToString(value: string, encode?: 'utf-8' | 'utf-16'): string;
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